TY  - JOUR
AU  - Stevanović, Sanja
AU  - Babić-Samardžija, Ksenija
AU  - Sovilj, Sofija P.
AU  - Tripković, Amalija
AU  - Jovanović, Vladislava M.
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/553
AB  - Platinum electrode decorated with three different mixed-ligand cobalt(III) complexes of the general formula [Co(Rdtc)cyclam](ClO4)(2) [cyclam = 1,4,8,11-tetraazacyclotetradecane, Rdtc(-) = morpholine-(Morphdtc), piperidine-(Pipdtc), and 4-methylpiperidine-(4-Mepipdtc) dithiocarbamates, respectively] was used to study oxidation of formic acid in acidic solution. The complexes were adsorbed on differently prepared Pt surfaces, at open circuit potential. The preliminary results show increased catalytic activity of Pt for formic acid oxidation with complex ion adsorbed on the polycrystalline surfaces. The increase in catalytic activity depends on the structure of the complex applied and follows the order of metal-coordinated bidentate ligand as Morphdtc > Pipdtc > 4-Mepipdtc. Based on IR and NMR data, the main characteristics of the Rdtc ligands do not vary dramatically, but high symmetry of the corresponding complexes decreases in the same order. Accordingly, the complexes are distinctively more mobile, causing chemical interactions to occur on the surface with appreciable speed and enhanced selectivity. The effect of the complexes on catalytic activity presumably depends on structural changes on Pt surfaces caused by their adsorption.
PB  - Maik Nauka/Interperiodica/Springer, New York
T2  - Russian Journal of Physical Chemistry A
T1  - Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes
VL  - 83
IS  - 9
SP  - 1442
EP  - 1446
DO  - 10.1134/S0036024409090040
ER  - 

@article{
author = "Stevanović, Sanja and Babić-Samardžija, Ksenija and Sovilj, Sofija P. and Tripković, Amalija and Jovanović, Vladislava M.",
year = "2009",
abstract = "Platinum electrode decorated with three different mixed-ligand cobalt(III) complexes of the general formula [Co(Rdtc)cyclam](ClO4)(2) [cyclam = 1,4,8,11-tetraazacyclotetradecane, Rdtc(-) = morpholine-(Morphdtc), piperidine-(Pipdtc), and 4-methylpiperidine-(4-Mepipdtc) dithiocarbamates, respectively] was used to study oxidation of formic acid in acidic solution. The complexes were adsorbed on differently prepared Pt surfaces, at open circuit potential. The preliminary results show increased catalytic activity of Pt for formic acid oxidation with complex ion adsorbed on the polycrystalline surfaces. The increase in catalytic activity depends on the structure of the complex applied and follows the order of metal-coordinated bidentate ligand as Morphdtc > Pipdtc > 4-Mepipdtc. Based on IR and NMR data, the main characteristics of the Rdtc ligands do not vary dramatically, but high symmetry of the corresponding complexes decreases in the same order. Accordingly, the complexes are distinctively more mobile, causing chemical interactions to occur on the surface with appreciable speed and enhanced selectivity. The effect of the complexes on catalytic activity presumably depends on structural changes on Pt surfaces caused by their adsorption.",
publisher = "Maik Nauka/Interperiodica/Springer, New York",
journal = "Russian Journal of Physical Chemistry A",
title = "Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes",
volume = "83",
number = "9",
pages = "1442-1446",
doi = "10.1134/S0036024409090040"
}

Stevanović, S., Babić-Samardžija, K., Sovilj, S. P., Tripković, A.,& Jovanović, V. M.. (2009). Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes. in Russian Journal of Physical Chemistry A
Maik Nauka/Interperiodica/Springer, New York., 83(9), 1442-1446.
https://doi.org/10.1134/S0036024409090040

Stevanović S, Babić-Samardžija K, Sovilj SP, Tripković A, Jovanović VM. Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes. in Russian Journal of Physical Chemistry A. 2009;83(9):1442-1446.
doi:10.1134/S0036024409090040 .

Stevanović, Sanja, Babić-Samardžija, Ksenija, Sovilj, Sofija P., Tripković, Amalija, Jovanović, Vladislava M., "Oxidation of formic acid on platinum surfaces decorated with cobalt(III) macrocyclic complexes" in Russian Journal of Physical Chemistry A, 83, no. 9 (2009):1442-1446,
https://doi.org/10.1134/S0036024409090040 . .

TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Hackerman, Norman
AU  - Sovilj, Sofija P.
AU  - Jovanović, Vladislava M.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/483
AB  - The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.
T2  - Journal of Solid State Electrochemistry
T1  - The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution
VL  - 12
IS  - 2
SP  - 155
EP  - 163
DO  - 10.1007/s10008-007-0375-4
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Hackerman, Norman and Sovilj, Sofija P. and Jovanović, Vladislava M.",
year = "2008",
abstract = "The inhibiting effect of cobalt(III) complexes with macrocyclic ligand cyclam (1,4,8,11-tetraazacyclotetradecane) and β-diketonato ligands have been investigated on iron corrosion in 0.1 M HClO 4 by potentiodynamic, linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) measurements. Analysis of the polarization curves and impedance spectra, by adding complex compounds to the acid solution and comparing with inhibitor-free solution, show corrosion current decrease and charge transfer resistance increase, respectively. Impedance data are fitted with equivalent circuit models. The stability of the adsorbed film was followed by LPR. Scanning electron microscopy (SEM) was used to screen physical changes of the reacted surfaces both treated and untreated. The differences in inhibitor efficiencies depend on the substituent group of the coordinated β-diketone ligand. Structural and electronic properties of this group of compounds in relation to inhibitor efficiency were analyzed by using the molecular modeling structures and correlated with previously reported spectroscopy data.",
journal = "Journal of Solid State Electrochemistry",
title = "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution",
volume = "12",
number = "2",
pages = "155-163",
doi = "10.1007/s10008-007-0375-4"
}

Babić-Samardžija, K., Hackerman, N., Sovilj, S. P.,& Jovanović, V. M.. (2008). The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry, 12(2), 155-163.
https://doi.org/10.1007/s10008-007-0375-4

Babić-Samardžija K, Hackerman N, Sovilj SP, Jovanović VM. The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution. in Journal of Solid State Electrochemistry. 2008;12(2):155-163.
doi:10.1007/s10008-007-0375-4 .

Babić-Samardžija, Ksenija, Hackerman, Norman, Sovilj, Sofija P., Jovanović, Vladislava M., "The inhibiting effect of cobalt(III)-cyclam complexes with substituted β-diketones on iron corrosion in perchlorate solution" in Journal of Solid State Electrochemistry, 12, no. 2 (2008):155-163,
https://doi.org/10.1007/s10008-007-0375-4 . .

TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Jovanović, Vladislava M.
AU  - Sovilj, Sofija P.
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/433
AB  - Four mixed-ligand cobalt(III) complexes (1-4) of the general formula [Co(Rdtc)cyclam](ClO4)2 and [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetra- azacyclotetradecane; Rdtc = thiomorpholine-(Timdtc) or 2-methylpiperidine-(2-Mepipdtc) dithiocarbamates; Rac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (Hfac) or 2,2,6,6-tetramethyl-3,5-heptanedionato (Tmhd), respectively) were electrochemically examined on a glassy carbon and an iron electrode in perchloric acid solution. The obtained results showed the influence of these complexes on hydrogen evolution, the oxygen reduction reaction and iron dissolution. The exhibited effects of the complexes on these reactions depend on structure related to the bidentate dithiocarbamato or b-diketonato ligand. The electrochemical properties of the complexes were correlated with molecular structure and parameters derived from spectral analysis and molecular modeling.
AB  - Četiri mešovito-ligandna kobalt(III) kompleksa opšte formule [Co(Rdtc)cyclam](ClO4)2 i [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetraazaciklotetradekan; Rdtc = tiomorfolin--(timdtc) ili 2-metilpiperidin-(2-mepipdtc) ditiokarbamat; Rac = 1,1,1,5,5,5-heksafluoro- -2,4-pentanedionato (hfac) ili 2,2,6,6-tetrametil-3,5-heptanedionato (tmhd)) ispitana su elektrohemijski na elektrodama od staklastog ugljenika i gvožđa u rastvoru perhlorata. Dobijeni rezultati ukazuju na to da ovi kompleksi utiču na izdvajanje vodonika, redukciju kiseonika kao i na rastvaranje gvožđa. Elektrohemijsko ponašanje zavisi od strukture koordinovanog bidentatnog ditiokarbamato ili b-diketonato liganda. Molekulska struktura kompleksnih jedinjenja određena je na osnovu spektroskopskih analiza i molekulskog modelovanja. Elektrokatalitički i inhibitorski efekat povezan je sa molekulskom strukturom kompleksa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes
T1  - Korelacija molekulske strukture i elektrohemijskih svojstava kobalt(III) kompleksa sa mešovitim ligandima
VL  - 73
IS  - 7
SP  - 761
EP  - 770
DO  - 10.2298/JSC0807761B
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Jovanović, Vladislava M. and Sovilj, Sofija P.",
year = "2008",
abstract = "Four mixed-ligand cobalt(III) complexes (1-4) of the general formula [Co(Rdtc)cyclam](ClO4)2 and [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetra- azacyclotetradecane; Rdtc = thiomorpholine-(Timdtc) or 2-methylpiperidine-(2-Mepipdtc) dithiocarbamates; Rac = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionato (Hfac) or 2,2,6,6-tetramethyl-3,5-heptanedionato (Tmhd), respectively) were electrochemically examined on a glassy carbon and an iron electrode in perchloric acid solution. The obtained results showed the influence of these complexes on hydrogen evolution, the oxygen reduction reaction and iron dissolution. The exhibited effects of the complexes on these reactions depend on structure related to the bidentate dithiocarbamato or b-diketonato ligand. The electrochemical properties of the complexes were correlated with molecular structure and parameters derived from spectral analysis and molecular modeling., Četiri mešovito-ligandna kobalt(III) kompleksa opšte formule [Co(Rdtc)cyclam](ClO4)2 i [Co(Rac)cyclam](ClO4)2 (cyclam = 1,4,8,11-tetraazaciklotetradekan; Rdtc = tiomorfolin--(timdtc) ili 2-metilpiperidin-(2-mepipdtc) ditiokarbamat; Rac = 1,1,1,5,5,5-heksafluoro- -2,4-pentanedionato (hfac) ili 2,2,6,6-tetrametil-3,5-heptanedionato (tmhd)) ispitana su elektrohemijski na elektrodama od staklastog ugljenika i gvožđa u rastvoru perhlorata. Dobijeni rezultati ukazuju na to da ovi kompleksi utiču na izdvajanje vodonika, redukciju kiseonika kao i na rastvaranje gvožđa. Elektrohemijsko ponašanje zavisi od strukture koordinovanog bidentatnog ditiokarbamato ili b-diketonato liganda. Molekulska struktura kompleksnih jedinjenja određena je na osnovu spektroskopskih analiza i molekulskog modelovanja. Elektrokatalitički i inhibitorski efekat povezan je sa molekulskom strukturom kompleksa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes, Korelacija molekulske strukture i elektrohemijskih svojstava kobalt(III) kompleksa sa mešovitim ligandima",
volume = "73",
number = "7",
pages = "761-770",
doi = "10.2298/JSC0807761B"
}

Babić-Samardžija, K., Jovanović, V. M.,& Sovilj, S. P.. (2008). Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(7), 761-770.
https://doi.org/10.2298/JSC0807761B

Babić-Samardžija K, Jovanović VM, Sovilj SP. Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes. in Journal of the Serbian Chemical Society. 2008;73(7):761-770.
doi:10.2298/JSC0807761B .

Babić-Samardžija, Ksenija, Jovanović, Vladislava M., Sovilj, Sofija P., "Molecular structure in correlation with electrochemical properties of mixed-ligand cobalt(III) complexes" in Journal of the Serbian Chemical Society, 73, no. 7 (2008):761-770,
https://doi.org/10.2298/JSC0807761B . .

TY  - JOUR
AU  - Jovanović, Vladislava M.
AU  - Babić-Samardžija, Ksenija
AU  - Sovilj, Sofija P.
PY  - 2005
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/194
AB  - Eight mixed-ligand cobalt(III) complexes with the macrocyclic amine 1,4,8,11-tetraazacyclotetradecane (cyclam) and a heterocyclic dithiocarbamate (Rdtc-)i.e., morpholine-(Morphdtc), thiomorpholine- (Timdtc), piperazine-(Pzdtc), N-methylpiperazine-(Mepzdtc), piperidine- (Pipdtc), 2-, 3- or 4-methylpiperidine-(2-, 3- and 4-Mepipdtc) carbodithionato-S,S ions, of the general formula [Co(cyclam)Rdtc](ClO4)2, were investigated in deoxygenated 0.1 MHClO4 solutions. Cyclic voltammetry data at a glassy carbon (GC) electrode demonstrate a redox reaction of cobalt(III) from the complexes at potentials strongly influenced by the presence of different heterocyclic Rdtc- ligands. In this respect, the complexes were separated into two groups: the first, with a heteroatom O, S or N in the heterocyclic ring, and the second, with a methyl group on the piperidine ring of the Rdtc- ligand. Anodic polarization of an Fe electrode in the presence of the complexes shows their influence not only on the dissolution of iron but also on the hydrogen evolution reactions and on this basis complexes the complexes could be divided into the same two groups. It was found that the weaker the inhibiting effect of the free heterocyclic amines is, the significantly higher is the efficiency of the corresponding complexes.
AB  - Osam mešovito-ligandnih kompleksa kobalta(III) sa makrocikličnim aminom 1,4,8,11-tetraazaciklotetradekanom (cyclam) i heterocikličnim ditiokarbamatima (Rdtc-) t.j., morfolin-(Morphdtc), tiomorfolin-(Timdtc), piperazin-(Pzdtc), N-metilpiperazin-(Mepzdtc), piperidin-(Pipdtc), 2-, 3- ili 4-metilpiperidin- (2-, 3- i 4-Mepipdtc) karboditionato-S,S jonima, opšte formule [Co(cyclam)Rdtc)](ClO4)2 , ispitano je u 0,1 M HClO4 rastvoru na elektrodi od staklastog ugljenika i gvožđa. Ciklična voltametrija na elektrodi od staklastog ugljenika pokazala je da dolazi do redoks reakcije kobalt(III) jona iz kompleksa. Različiti heterociklični Rdtc- ligandi utiču na vrednost potencijala ove redoks reakcije. Na osnovu ovih vrednosti kompleksi se mogu podeliti u dve grupe: jednu sa heteroatomom u heterocikličnom prstenu i drugu sa metil-grupom na piperidinskom prstenu Rdtc- liganda. Anodna polarizacija gvožđa u prisustvu kompleksa pokazala je njihov uticaj ne samo na reakciju rastvaranja metala već i na reakciju izdvajanja vodonika. Rezultati su pokazali da što je slabiji inhibitorski efekat heterocikličnog amina to je veći uticaj odgovarajućeg kompleksa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - The effect of heterocyclic S,S’-ligands on the electrochemical properties of some cobalt(III) complexes in acid
T1  - Uticaj heterocikličnih S,S’-liganada na elektrohemijske osobine nekih kobalt(III) kompleksa u kiseloj sredini
VL  - 70
IS  - 1
SP  - 51
EP  - 61
DO  - 10.2298/JSC0501051J
ER  - 

@article{
author = "Jovanović, Vladislava M. and Babić-Samardžija, Ksenija and Sovilj, Sofija P.",
year = "2005",
abstract = "Eight mixed-ligand cobalt(III) complexes with the macrocyclic amine 1,4,8,11-tetraazacyclotetradecane (cyclam) and a heterocyclic dithiocarbamate (Rdtc-)i.e., morpholine-(Morphdtc), thiomorpholine- (Timdtc), piperazine-(Pzdtc), N-methylpiperazine-(Mepzdtc), piperidine- (Pipdtc), 2-, 3- or 4-methylpiperidine-(2-, 3- and 4-Mepipdtc) carbodithionato-S,S ions, of the general formula [Co(cyclam)Rdtc](ClO4)2, were investigated in deoxygenated 0.1 MHClO4 solutions. Cyclic voltammetry data at a glassy carbon (GC) electrode demonstrate a redox reaction of cobalt(III) from the complexes at potentials strongly influenced by the presence of different heterocyclic Rdtc- ligands. In this respect, the complexes were separated into two groups: the first, with a heteroatom O, S or N in the heterocyclic ring, and the second, with a methyl group on the piperidine ring of the Rdtc- ligand. Anodic polarization of an Fe electrode in the presence of the complexes shows their influence not only on the dissolution of iron but also on the hydrogen evolution reactions and on this basis complexes the complexes could be divided into the same two groups. It was found that the weaker the inhibiting effect of the free heterocyclic amines is, the significantly higher is the efficiency of the corresponding complexes., Osam mešovito-ligandnih kompleksa kobalta(III) sa makrocikličnim aminom 1,4,8,11-tetraazaciklotetradekanom (cyclam) i heterocikličnim ditiokarbamatima (Rdtc-) t.j., morfolin-(Morphdtc), tiomorfolin-(Timdtc), piperazin-(Pzdtc), N-metilpiperazin-(Mepzdtc), piperidin-(Pipdtc), 2-, 3- ili 4-metilpiperidin- (2-, 3- i 4-Mepipdtc) karboditionato-S,S jonima, opšte formule [Co(cyclam)Rdtc)](ClO4)2 , ispitano je u 0,1 M HClO4 rastvoru na elektrodi od staklastog ugljenika i gvožđa. Ciklična voltametrija na elektrodi od staklastog ugljenika pokazala je da dolazi do redoks reakcije kobalt(III) jona iz kompleksa. Različiti heterociklični Rdtc- ligandi utiču na vrednost potencijala ove redoks reakcije. Na osnovu ovih vrednosti kompleksi se mogu podeliti u dve grupe: jednu sa heteroatomom u heterocikličnom prstenu i drugu sa metil-grupom na piperidinskom prstenu Rdtc- liganda. Anodna polarizacija gvožđa u prisustvu kompleksa pokazala je njihov uticaj ne samo na reakciju rastvaranja metala već i na reakciju izdvajanja vodonika. Rezultati su pokazali da što je slabiji inhibitorski efekat heterocikličnog amina to je veći uticaj odgovarajućeg kompleksa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "The effect of heterocyclic S,S’-ligands on the electrochemical properties of some cobalt(III) complexes in acid, Uticaj heterocikličnih S,S’-liganada na elektrohemijske osobine nekih kobalt(III) kompleksa u kiseloj sredini",
volume = "70",
number = "1",
pages = "51-61",
doi = "10.2298/JSC0501051J"
}

Jovanović, V. M., Babić-Samardžija, K.,& Sovilj, S. P.. (2005). The effect of heterocyclic S,S’-ligands on the electrochemical properties of some cobalt(III) complexes in acid. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 70(1), 51-61.
https://doi.org/10.2298/JSC0501051J

Jovanović VM, Babić-Samardžija K, Sovilj SP. The effect of heterocyclic S,S’-ligands on the electrochemical properties of some cobalt(III) complexes in acid. in Journal of the Serbian Chemical Society. 2005;70(1):51-61.
doi:10.2298/JSC0501051J .

Jovanović, Vladislava M., Babić-Samardžija, Ksenija, Sovilj, Sofija P., "The effect of heterocyclic S,S’-ligands on the electrochemical properties of some cobalt(III) complexes in acid" in Journal of the Serbian Chemical Society, 70, no. 1 (2005):51-61,
https://doi.org/10.2298/JSC0501051J . .

TY  - JOUR
AU  - Babić-Samardžija, Ksenija
AU  - Sovilj, Sofija P.
AU  - Jovanović, Vladislava M.
PY  - 2003
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/119
AB  - The electrochemical properties of eight mixed-ligand cobalt(III) and co balt(II) complexes of the general formulas [CoIII(Rac)cyclam (ClO4)2 (1)–(4) and [Co2II(Rac)tpmc](ClO4)3 (5)–(8) were studied. The substances were investigated in aqueous NaClO4 solution and non-aqueous LiClO4/CH3CN solution by cyclic voltam metry at a glassy carbon electrode. In aqueous solution, cyclam and Rac ligands being soluble in water undergo anodic oxidation. Coordination to Co(III) in complexes 1–4, stabilizes these ligands but reversible peaks in catohodic region indicate the redox reaction CoIII/CoII ion. In the case of the binuclear Co(II) complexes 5–8, peaks recorded on the CVs represent oxidation of the bridged Rac ligand. The complexes examined influence the cathodic reaction of hydrogen evolution in aqueous solutions by shifting its potential to more negative values and its current is increased. In non-aqueous solution the CVs of the ligands show irreversible anodic peaks for cyclam, tpmc and for the Rac ligands soluble in acetonitrile. The absence of any peaks in the case of the investigated complexes 1–4 indicates that coordination to Co(III) stabilizes both the cyclam and Rac ligands. Cyclic voltammograms of the complexes 5–8 show oxidation processes of the Rac ligand and Co(II) ions but the absence of a highly anodic peak of the coordinated macrocycle tpmc shows its stabilization. Contrary to in aqueous solution, the redox reaction Co(III)/Co(II) does not occur in acetonitrate indicating a higher stability of the complexes 1–4 in this media in comparison with the binuclear cobalt(II)-tpmc complexes 5–8.
AB  - Cikličnom voltametrijom ispitano je osam kompleksa kobalta(III) i kobalta(II)sa mešovitim ligandima, opšte formule CoIII(Rac)cyclam (ClO4)2 (1)–(4) i CoII(Rac)tpmc (ClO4)3 (5)–(8), u vodenoj (NaClO4) i nevodenoj (LiClO4/CH3CN) sredini. U vodenoj sredini cyclam i Rac ligandi podležu anodnoj oksidaciji. Koordinacija sa Co(III) u komp- leksima (1)–(4) stabilizuje ove ligande ali dolazi do redoks reakcije Co(III)/Co(II).U slučaju binukelarnih Co(II) kompleksa (5)–(8) dolazi do oksidacije Rac liganada. Ispitivani kompleksi u vodenom rastvoru utiču na reakciju izdvajanja vodonika katodno pomerajući potencijal i povećavajući struju. U nevodenim rastvorima anodno se oksiduju oba makrociklična (cyclam i tpmc) i Rac ligandi rastvorni u acetonitrilu. Međutim, u ovim rastvorima Co(III) kompleksa ne dolazi do elektrohemijskih reakcija što znači ne samo da i ovde koordinacija sa kobaltom stabilizuje ligande već nema ni redoks reakcije za kobalt. Sa druge strane, u Co(II) komplesima stabilizovan je tpmc ali se oksiduju Rac ligandi i Co(II) pa su tako u nevodenim rastvorima kompleksi Co(III) stabiliniji od binukelarnih Co(II)-tpmc kompleksa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Comparative electrochemical study of some cobalt(III) and cobalt(II) complexes with azamacrocyles and β-diketonato ligands
T1  - Komparativno elektrohemijsko ispitivanje nekih kobalt(III)i kobalt(II) kompleksa sa azamakrocikličnim i β-diketonato ligandima
VL  - 68
IS  - 12
SP  - 989
EP  - 999
DO  - 10.2298/0352-51390312989B
ER  - 

@article{
author = "Babić-Samardžija, Ksenija and Sovilj, Sofija P. and Jovanović, Vladislava M.",
year = "2003",
abstract = "The electrochemical properties of eight mixed-ligand cobalt(III) and co balt(II) complexes of the general formulas [CoIII(Rac)cyclam (ClO4)2 (1)–(4) and [Co2II(Rac)tpmc](ClO4)3 (5)–(8) were studied. The substances were investigated in aqueous NaClO4 solution and non-aqueous LiClO4/CH3CN solution by cyclic voltam metry at a glassy carbon electrode. In aqueous solution, cyclam and Rac ligands being soluble in water undergo anodic oxidation. Coordination to Co(III) in complexes 1–4, stabilizes these ligands but reversible peaks in catohodic region indicate the redox reaction CoIII/CoII ion. In the case of the binuclear Co(II) complexes 5–8, peaks recorded on the CVs represent oxidation of the bridged Rac ligand. The complexes examined influence the cathodic reaction of hydrogen evolution in aqueous solutions by shifting its potential to more negative values and its current is increased. In non-aqueous solution the CVs of the ligands show irreversible anodic peaks for cyclam, tpmc and for the Rac ligands soluble in acetonitrile. The absence of any peaks in the case of the investigated complexes 1–4 indicates that coordination to Co(III) stabilizes both the cyclam and Rac ligands. Cyclic voltammograms of the complexes 5–8 show oxidation processes of the Rac ligand and Co(II) ions but the absence of a highly anodic peak of the coordinated macrocycle tpmc shows its stabilization. Contrary to in aqueous solution, the redox reaction Co(III)/Co(II) does not occur in acetonitrate indicating a higher stability of the complexes 1–4 in this media in comparison with the binuclear cobalt(II)-tpmc complexes 5–8., Cikličnom voltametrijom ispitano je osam kompleksa kobalta(III) i kobalta(II)sa mešovitim ligandima, opšte formule CoIII(Rac)cyclam (ClO4)2 (1)–(4) i CoII(Rac)tpmc (ClO4)3 (5)–(8), u vodenoj (NaClO4) i nevodenoj (LiClO4/CH3CN) sredini. U vodenoj sredini cyclam i Rac ligandi podležu anodnoj oksidaciji. Koordinacija sa Co(III) u komp- leksima (1)–(4) stabilizuje ove ligande ali dolazi do redoks reakcije Co(III)/Co(II).U slučaju binukelarnih Co(II) kompleksa (5)–(8) dolazi do oksidacije Rac liganada. Ispitivani kompleksi u vodenom rastvoru utiču na reakciju izdvajanja vodonika katodno pomerajući potencijal i povećavajući struju. U nevodenim rastvorima anodno se oksiduju oba makrociklična (cyclam i tpmc) i Rac ligandi rastvorni u acetonitrilu. Međutim, u ovim rastvorima Co(III) kompleksa ne dolazi do elektrohemijskih reakcija što znači ne samo da i ovde koordinacija sa kobaltom stabilizuje ligande već nema ni redoks reakcije za kobalt. Sa druge strane, u Co(II) komplesima stabilizovan je tpmc ali se oksiduju Rac ligandi i Co(II) pa su tako u nevodenim rastvorima kompleksi Co(III) stabiliniji od binukelarnih Co(II)-tpmc kompleksa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Comparative electrochemical study of some cobalt(III) and cobalt(II) complexes with azamacrocyles and β-diketonato ligands, Komparativno elektrohemijsko ispitivanje nekih kobalt(III)i kobalt(II) kompleksa sa azamakrocikličnim i β-diketonato ligandima",
volume = "68",
number = "12",
pages = "989-999",
doi = "10.2298/0352-51390312989B"
}

Babić-Samardžija, K., Sovilj, S. P.,& Jovanović, V. M.. (2003). Comparative electrochemical study of some cobalt(III) and cobalt(II) complexes with azamacrocyles and β-diketonato ligands. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 68(12), 989-999.
https://doi.org/10.2298/0352-51390312989B

Babić-Samardžija K, Sovilj SP, Jovanović VM. Comparative electrochemical study of some cobalt(III) and cobalt(II) complexes with azamacrocyles and β-diketonato ligands. in Journal of the Serbian Chemical Society. 2003;68(12):989-999.
doi:10.2298/0352-51390312989B .

Babić-Samardžija, Ksenija, Sovilj, Sofija P., Jovanović, Vladislava M., "Comparative electrochemical study of some cobalt(III) and cobalt(II) complexes with azamacrocyles and β-diketonato ligands" in Journal of the Serbian Chemical Society, 68, no. 12 (2003):989-999,
https://doi.org/10.2298/0352-51390312989B . .

TY  - JOUR
AU  - Jovanović, Vladislava M.
AU  - Babić-Samardžija, Ksenija
AU  - Sovilj, Sofija P.
PY  - 2001
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3656
AB  - Electrochemical stability of eight complexes of the general formula [co 111 Rdtc(1-8)cyclam](ClO 4 ) 2 , where cyclam=1,4,8,11-tetraazacyclotetradecane and Rdtc - (1-8)=4-morpholine (Morphdtc), 4-thiomorpholine (Timdtc), 4-piperazine (Pzdtc), N-methyl piperazine (N-Mepzdtc), piperidine (Pipdtc), 2-, 3- or 4-methylpiperidine (2-, 3- or 4-Mepipdtc) dithiocarbamates, respectively, were studied. The substances were examined in aqueous NaClO 4 solution and nonaqueous LiClO 4 in CH 3 CN solution by cyclic voltammetry. In aqueous solution, macrocyclic ligand cyclam is characterized by the anodic peak at 0.95 V. The Rdtc - ligands have two anodic peaks, one in the region 0.25-0.30 V and the other in the 0.78-0.95 V region. Absence of these anodic peaks in the case of the complexes indicates that coordination to cobalt(III) stabilizes both cyclam and Rdtc - ligands, but reversible peaks in the range -0.68 to -0.78 V support the Co(III) redox reaction. In nonaqueous solutions cyclam has one anodic peak at 1.75 V. The ligands with heteroatom in the ring (Morphdtc, Timdtc, Pzdtc, N-Mepzdtc) have two anodic peaks, while the other four ligands (Pipdtc, 2-, 3- and 4-Mepipdtc) have only one anodic peak. In nonaqueous solution again, coordination to Co(III) ion stabilizes the Rdtc - ligands and contrary to aqueous solution no Co(III) redox reaction occurs, indicating a greater stability of the complexes in this media. Finally, the electrochemical results are compared with spectroscopic data obtained previously.
PB  - Wiley-VCH Verlag GmbH
T2  - Electroanalysis
T1  - Electrochemical examination of mixed-ligand cobalt(III) complexes with tetraazamacrocyclic ligand and heterocyclic dithiocarbamates
VL  - 13
IS  - 13
SP  - 1129
EP  - 1135
DO  - 10.1002/1521-4109(200109)13:13<1129::AID-ELAN1129>3.0.CO;2-K
ER  - 

@article{
author = "Jovanović, Vladislava M. and Babić-Samardžija, Ksenija and Sovilj, Sofija P.",
year = "2001",
abstract = "Electrochemical stability of eight complexes of the general formula [co 111 Rdtc(1-8)cyclam](ClO 4 ) 2 , where cyclam=1,4,8,11-tetraazacyclotetradecane and Rdtc - (1-8)=4-morpholine (Morphdtc), 4-thiomorpholine (Timdtc), 4-piperazine (Pzdtc), N-methyl piperazine (N-Mepzdtc), piperidine (Pipdtc), 2-, 3- or 4-methylpiperidine (2-, 3- or 4-Mepipdtc) dithiocarbamates, respectively, were studied. The substances were examined in aqueous NaClO 4 solution and nonaqueous LiClO 4 in CH 3 CN solution by cyclic voltammetry. In aqueous solution, macrocyclic ligand cyclam is characterized by the anodic peak at 0.95 V. The Rdtc - ligands have two anodic peaks, one in the region 0.25-0.30 V and the other in the 0.78-0.95 V region. Absence of these anodic peaks in the case of the complexes indicates that coordination to cobalt(III) stabilizes both cyclam and Rdtc - ligands, but reversible peaks in the range -0.68 to -0.78 V support the Co(III) redox reaction. In nonaqueous solutions cyclam has one anodic peak at 1.75 V. The ligands with heteroatom in the ring (Morphdtc, Timdtc, Pzdtc, N-Mepzdtc) have two anodic peaks, while the other four ligands (Pipdtc, 2-, 3- and 4-Mepipdtc) have only one anodic peak. In nonaqueous solution again, coordination to Co(III) ion stabilizes the Rdtc - ligands and contrary to aqueous solution no Co(III) redox reaction occurs, indicating a greater stability of the complexes in this media. Finally, the electrochemical results are compared with spectroscopic data obtained previously.",
publisher = "Wiley-VCH Verlag GmbH",
journal = "Electroanalysis",
title = "Electrochemical examination of mixed-ligand cobalt(III) complexes with tetraazamacrocyclic ligand and heterocyclic dithiocarbamates",
volume = "13",
number = "13",
pages = "1129-1135",
doi = "10.1002/1521-4109(200109)13:13<1129::AID-ELAN1129>3.0.CO;2-K"
}

Jovanović, V. M., Babić-Samardžija, K.,& Sovilj, S. P.. (2001). Electrochemical examination of mixed-ligand cobalt(III) complexes with tetraazamacrocyclic ligand and heterocyclic dithiocarbamates. in Electroanalysis
Wiley-VCH Verlag GmbH., 13(13), 1129-1135.
https://doi.org/10.1002/1521-4109(200109)13:13<1129::AID-ELAN1129>3.0.CO;2-K

Jovanović VM, Babić-Samardžija K, Sovilj SP. Electrochemical examination of mixed-ligand cobalt(III) complexes with tetraazamacrocyclic ligand and heterocyclic dithiocarbamates. in Electroanalysis. 2001;13(13):1129-1135.
doi:10.1002/1521-4109(200109)13:13<1129::AID-ELAN1129>3.0.CO;2-K .

Jovanović, Vladislava M., Babić-Samardžija, Ksenija, Sovilj, Sofija P., "Electrochemical examination of mixed-ligand cobalt(III) complexes with tetraazamacrocyclic ligand and heterocyclic dithiocarbamates" in Electroanalysis, 13, no. 13 (2001):1129-1135,
https://doi.org/10.1002/1521-4109(200109)13:13<1129::AID-ELAN1129>3.0.CO;2-K . .

TY  - JOUR
AU  - Sovilj, Sofija P.
AU  - Vučković, Gordana
AU  - Babić-Samardžija, Ksenija
AU  - Matsumoto, N.
AU  - Jovanović, Vladislava M.
AU  - Mrozinski, J.
PY  - 1999
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3672
AB  - A new dinuclear cobalt(II) complex, [Co2(ox)tpmc](ClO4)2 3H2O, (tpmc = N, N′, N″, N″′-tetrakis(2-pyridylmethyl)-1, 4, 8, 11-tetraazacyclotetradecane, ox2 -oxalate ion), has been synthesized and its crystal structure solved by single crystal X-ray diffraction studies. It crystallizes in the monoclinic system, space group P21, with a = 97558(8) A, b = 21.455(2) A, c - 21.241(2) A, β=100.069(8)°, V=4391.0(8) A3, Z =4,R = 0.083, Rw = 0.086. Its structure consists of two dinuclear, crystallographically unique molecules in which the oxalate ion bridges two cobalt(II) ions unsymmetrically. E:ach cobalt is hexa-coordinated with four macrocyclic nitrogens and two oxygens in an octahedral arrangement of an “em” coordination of a macrocyclic ligand. The third oxygen is simultaneously bonded to both cobalt ions and the last one remains uncoordinated, which is the unique way of oxalato ion coordination. Intramolecular antiferromagnetic coupling between the two cobalt(II) ions is observed and yielded J = -9.3 an−1, g - 5.64 and g = 1.21. The variable temperature (4.2-192 K) inagiietic susceptibility nieasureinents are interpreted on the basis of the spin lamiltonian H 25/9JSASB + goβHz(SAZ - SBZ). Cyclic voltanllnetiy suggests that the complex is electrochcmically stable up to the potential of the cobalt reduction.
PB  - Taylor and Francis
T2  - Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry
T1  - Synthesis, crystal structure, magnetic properties and cyclic voltammetry of the unsymmetric (μ-oxalato)-[N,N′,N″,N‴-tetrakis-(2-pyridylmethyl)-1,4,8, 11-tetraazacyclotetra-decane]dicobalt(II) perchlorate trihydrate
VL  - 29
IS  - 5
SP  - 785
EP  - 803
DO  - 10.1080/00945719909349487
ER  - 

@article{
author = "Sovilj, Sofija P. and Vučković, Gordana and Babić-Samardžija, Ksenija and Matsumoto, N. and Jovanović, Vladislava M. and Mrozinski, J.",
year = "1999",
abstract = "A new dinuclear cobalt(II) complex, [Co2(ox)tpmc](ClO4)2 3H2O, (tpmc = N, N′, N″, N″′-tetrakis(2-pyridylmethyl)-1, 4, 8, 11-tetraazacyclotetradecane, ox2 -oxalate ion), has been synthesized and its crystal structure solved by single crystal X-ray diffraction studies. It crystallizes in the monoclinic system, space group P21, with a = 97558(8) A, b = 21.455(2) A, c - 21.241(2) A, β=100.069(8)°, V=4391.0(8) A3, Z =4,R = 0.083, Rw = 0.086. Its structure consists of two dinuclear, crystallographically unique molecules in which the oxalate ion bridges two cobalt(II) ions unsymmetrically. E:ach cobalt is hexa-coordinated with four macrocyclic nitrogens and two oxygens in an octahedral arrangement of an “em” coordination of a macrocyclic ligand. The third oxygen is simultaneously bonded to both cobalt ions and the last one remains uncoordinated, which is the unique way of oxalato ion coordination. Intramolecular antiferromagnetic coupling between the two cobalt(II) ions is observed and yielded J = -9.3 an−1, g - 5.64 and g = 1.21. The variable temperature (4.2-192 K) inagiietic susceptibility nieasureinents are interpreted on the basis of the spin lamiltonian H 25/9JSASB + goβHz(SAZ - SBZ). Cyclic voltanllnetiy suggests that the complex is electrochcmically stable up to the potential of the cobalt reduction.",
publisher = "Taylor and Francis",
journal = "Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry",
title = "Synthesis, crystal structure, magnetic properties and cyclic voltammetry of the unsymmetric (μ-oxalato)-[N,N′,N″,N‴-tetrakis-(2-pyridylmethyl)-1,4,8, 11-tetraazacyclotetra-decane]dicobalt(II) perchlorate trihydrate",
volume = "29",
number = "5",
pages = "785-803",
doi = "10.1080/00945719909349487"
}

Sovilj, S. P., Vučković, G., Babić-Samardžija, K., Matsumoto, N., Jovanović, V. M.,& Mrozinski, J.. (1999). Synthesis, crystal structure, magnetic properties and cyclic voltammetry of the unsymmetric (μ-oxalato)-[N,N′,N″,N‴-tetrakis-(2-pyridylmethyl)-1,4,8, 11-tetraazacyclotetra-decane]dicobalt(II) perchlorate trihydrate. in Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry
Taylor and Francis., 29(5), 785-803.
https://doi.org/10.1080/00945719909349487

Sovilj SP, Vučković G, Babić-Samardžija K, Matsumoto N, Jovanović VM, Mrozinski J. Synthesis, crystal structure, magnetic properties and cyclic voltammetry of the unsymmetric (μ-oxalato)-[N,N′,N″,N‴-tetrakis-(2-pyridylmethyl)-1,4,8, 11-tetraazacyclotetra-decane]dicobalt(II) perchlorate trihydrate. in Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry. 1999;29(5):785-803.
doi:10.1080/00945719909349487 .

Sovilj, Sofija P., Vučković, Gordana, Babić-Samardžija, Ksenija, Matsumoto, N., Jovanović, Vladislava M., Mrozinski, J., "Synthesis, crystal structure, magnetic properties and cyclic voltammetry of the unsymmetric (μ-oxalato)-[N,N′,N″,N‴-tetrakis-(2-pyridylmethyl)-1,4,8, 11-tetraazacyclotetra-decane]dicobalt(II) perchlorate trihydrate" in Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry, 29, no. 5 (1999):785-803,
https://doi.org/10.1080/00945719909349487 . .