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Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation

Authorized Users Only
2015
Authors
Perić, Marko
Garcia-Fuente, Amador
Zlatar, Matija
Daul, Claude
Stepanović, Stepan
Garcia-Fernandez, Pablo
Gruden-Pavlović, Maja
Article (Published version)
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Abstract
In this work we have analyzed in detail the magnetic anisotropy in a series of hydrotris(pyrazolyl)borate (Tp(-)) metal complexes, namely [VTpCl](+), [CrTpCl](+), [MnTpCl](+), [FeTpCl], [CoTpCl], and [NiTpCl], and their substituted methyl and tert-butyl analogues with the goal of observing the effect of the ligand field on the magnetic properties. In the [VTpCl](+), [CrTpCl](+), [CoTpCl], and [NiTpCl] complexes, the magnetic anisotropy arises as a consequence of out-of-state spin-orbit coupling, and covalent changes induced by the substitution of hydrogen atoms on the pyrazolyl rings does not lead to drastic changes in the magnetic anisotropy. On the other hand, much larger magnetic anisotropies were predicted in complexes displaying a degenerate ground state, namely [MnTpCl](+) and [FeTpCl], due to in-state spin-orbit coupling. The anisotropy in these systems was shown to be very sensitive to perturbations, for example, chemical substitution and distortions due to the Jahn-Teller effe...ct. We found that by substituting the hydrogen atoms in [MnTpCl](+) and [FeTpCl] by methyl and tert-butyl groups, certain covalent contributions to the magnetic anisotropy energy (MAE) could be controlled, thereby achieving higher values. Moreover, we showed that the selection of ion has important consequences for the symmetry of the ground spin-orbit term, opening the possibility of achieving zero magnetic tunneling even in non-Kramers ions. We have also shown that substitution may also contribute to a quenching of the Jahn-Teller effect, which could significantly reduce the magnetic anisotropy of the complexes studied.

Keywords:
density functional calculations / Jahn-Teller distortion / ligand-field effects / magnetic properties / scorpionate complexes
Source:
Chemistry-A European Journal, 2015, 21, 9, 3716-3726
Publisher:
  • Wiley-V C H Verlag Gmbh, Weinheim
Funding / projects:
  • Rational design and synthesis of biologically active and coordination compounds and functional materials, relevant for (bio)nanotechnology (RS-172035)
  • Swiss State Secretariat for Research and Innovation
  • Ramon y Cajal programme [RYC-2013-12515]
  • COST Action [CM1305, CM1006]
  • Spanish Ministerio of Economia y Competitividad [FIS2012-37549-C05-4]
  • Swiss National Science Foundation
Note:
  • The peer-reviewed version: http://cer.ihtm.bg.ac.rs/handle/123456789/2911

DOI: 10.1002/chem.201405480

ISSN: 0947-6539

PubMed: 25591004

WoS: 000350116200028

Scopus: 2-s2.0-84923044611
[ Google Scholar ]
12
12
URI
https://cer.ihtm.bg.ac.rs/handle/123456789/1730
Collections
  • Radovi istraživača / Researchers' publications
Institution/Community
IHTM
TY  - JOUR
AU  - Perić, Marko
AU  - Garcia-Fuente, Amador
AU  - Zlatar, Matija
AU  - Daul, Claude
AU  - Stepanović, Stepan
AU  - Garcia-Fernandez, Pablo
AU  - Gruden-Pavlović, Maja
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1730
AB  - In this work we have analyzed in detail the magnetic anisotropy in a series of hydrotris(pyrazolyl)borate (Tp(-)) metal complexes, namely [VTpCl](+), [CrTpCl](+), [MnTpCl](+), [FeTpCl], [CoTpCl], and [NiTpCl], and their substituted methyl and tert-butyl analogues with the goal of observing the effect of the ligand field on the magnetic properties. In the [VTpCl](+), [CrTpCl](+), [CoTpCl], and [NiTpCl] complexes, the magnetic anisotropy arises as a consequence of out-of-state spin-orbit coupling, and covalent changes induced by the substitution of hydrogen atoms on the pyrazolyl rings does not lead to drastic changes in the magnetic anisotropy. On the other hand, much larger magnetic anisotropies were predicted in complexes displaying a degenerate ground state, namely [MnTpCl](+) and [FeTpCl], due to in-state spin-orbit coupling. The anisotropy in these systems was shown to be very sensitive to perturbations, for example, chemical substitution and distortions due to the Jahn-Teller effect. We found that by substituting the hydrogen atoms in [MnTpCl](+) and [FeTpCl] by methyl and tert-butyl groups, certain covalent contributions to the magnetic anisotropy energy (MAE) could be controlled, thereby achieving higher values. Moreover, we showed that the selection of ion has important consequences for the symmetry of the ground spin-orbit term, opening the possibility of achieving zero magnetic tunneling even in non-Kramers ions. We have also shown that substitution may also contribute to a quenching of the Jahn-Teller effect, which could significantly reduce the magnetic anisotropy of the complexes studied.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Chemistry-A European Journal
T1  - Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation
VL  - 21
IS  - 9
SP  - 3716
EP  - 3726
DO  - 10.1002/chem.201405480
ER  - 
@article{
author = "Perić, Marko and Garcia-Fuente, Amador and Zlatar, Matija and Daul, Claude and Stepanović, Stepan and Garcia-Fernandez, Pablo and Gruden-Pavlović, Maja",
year = "2015",
abstract = "In this work we have analyzed in detail the magnetic anisotropy in a series of hydrotris(pyrazolyl)borate (Tp(-)) metal complexes, namely [VTpCl](+), [CrTpCl](+), [MnTpCl](+), [FeTpCl], [CoTpCl], and [NiTpCl], and their substituted methyl and tert-butyl analogues with the goal of observing the effect of the ligand field on the magnetic properties. In the [VTpCl](+), [CrTpCl](+), [CoTpCl], and [NiTpCl] complexes, the magnetic anisotropy arises as a consequence of out-of-state spin-orbit coupling, and covalent changes induced by the substitution of hydrogen atoms on the pyrazolyl rings does not lead to drastic changes in the magnetic anisotropy. On the other hand, much larger magnetic anisotropies were predicted in complexes displaying a degenerate ground state, namely [MnTpCl](+) and [FeTpCl], due to in-state spin-orbit coupling. The anisotropy in these systems was shown to be very sensitive to perturbations, for example, chemical substitution and distortions due to the Jahn-Teller effect. We found that by substituting the hydrogen atoms in [MnTpCl](+) and [FeTpCl] by methyl and tert-butyl groups, certain covalent contributions to the magnetic anisotropy energy (MAE) could be controlled, thereby achieving higher values. Moreover, we showed that the selection of ion has important consequences for the symmetry of the ground spin-orbit term, opening the possibility of achieving zero magnetic tunneling even in non-Kramers ions. We have also shown that substitution may also contribute to a quenching of the Jahn-Teller effect, which could significantly reduce the magnetic anisotropy of the complexes studied.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Chemistry-A European Journal",
title = "Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation",
volume = "21",
number = "9",
pages = "3716-3726",
doi = "10.1002/chem.201405480"
}
Perić, M., Garcia-Fuente, A., Zlatar, M., Daul, C., Stepanović, S., Garcia-Fernandez, P.,& Gruden-Pavlović, M.. (2015). Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation. in Chemistry-A European Journal
Wiley-V C H Verlag Gmbh, Weinheim., 21(9), 3716-3726.
https://doi.org/10.1002/chem.201405480
Perić M, Garcia-Fuente A, Zlatar M, Daul C, Stepanović S, Garcia-Fernandez P, Gruden-Pavlović M. Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation. in Chemistry-A European Journal. 2015;21(9):3716-3726.
doi:10.1002/chem.201405480 .
Perić, Marko, Garcia-Fuente, Amador, Zlatar, Matija, Daul, Claude, Stepanović, Stepan, Garcia-Fernandez, Pablo, Gruden-Pavlović, Maja, "Magnetic Anisotropy in "Scorpionate" First-Row Transition-Metal Complexes: A Theoretical Investigation" in Chemistry-A European Journal, 21, no. 9 (2015):3716-3726,
https://doi.org/10.1002/chem.201405480 . .

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