Synthesis and characterization of Fe(III) and Mn(II) complexes with condensation product of thiosemicarbazide and 2-acetylthiazole

Abstract

The HL ligand was synthesized in the reaction of thiosemicarbazide and 2-acetylthiazole in molar ratio 1:1 in water, with 3 drops of 2M HCl. Complex [Fe(L)2]BF4·H2O (1) was synthesized in the reaction of ligand and Fe(BF4)6·6H2O in MeOH, after complete dissolution of Fe(BF4)2·6H2O in the reaction mixture, NaN3 was added. In the reaction of ligand (HL), MnCl2·4H2O and NaN3, in molar rotio 1 : 1 : 4, Mn(II) complex (2) was obtained. Complexes 1 and 2 were characterized by elemental analysis, IR and UV/Vis spectroscopy and X-ray crystallographic analysis. Both complexes 1 and 2 with HL ligand are bis octahedral complexes in which two deprotonated ligand molecules coordinate in a mer arrangement through two NNS sets of donor atoms, through thiazole and imine nitrogens and thioenolate sulfur.

Ligand (HL) sintetisan je u reakciji tiosemikarbazida i 2-acetiltiazola u molarnom odnosu 1 : 1 u vodi, u kiseloj sredini. Kompleks [Fe(L)2]BF4·H2O (1) dobijen je u reakciji liganda i Fe(BF4)2·6H2O u metanolu i nakon potpunog rastvaranja Fe(II) soli dodat je NaN3 u višku (1 : 1 : 4). U reakciji liganda (HL), MnCl2·4H2O i NaN3 u molarnom odnosu 1 : 1 : 4, dobijen je kompleks Mn(II), [Mn(L)2] (2). Kompleksi 1 i 2 okarakterisani su elementalnom analizom, IC spektroskopijom, UV/Vis spektroskopijom i rendgenskom strukturnom analizom. Kod oba kompleksa 1 i 2 dolazi do forimiranja bis oktaedarske geometrije tako što se za centralni metalni jon koordinuju dva deprotonovana liganda preko dva NNS donorska seta atoma u mer okruženju. Do koordinacije liganda za centralni metalni jon, kako Fe(III), tako i Mn(II), dolazi preko dva azota, od kojih jedan potiče iz tiazola, a drugi iz iminske grupe, kao i preko sumpora iz tioenolatne grupe.