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Peer-reviewedCC BYInorganic chemistry

Lowering Coordination Symmetry as a Strategy for Tuning Slow Magnetic Relaxation in Quasi-Isotropic Mn(II) Systems.

  • Jacek Sawka1
  • Barbara Machura2
  • Roman Boča3
  • Cyril Rajnák3,4
  • Maciej Witwicki1
  • Dariusz Bieńko5
  • Pavel Kopel6
  • Alina Bieńko1
6 affiliations
  1. 1Faculty of Chemistry, University of Wroclaw, Joliot-Curie 14, 50-383Wrocław, Poland.
  2. 2Institute of Chemistry, University of Silesia, Ninth Szkolna Street, 40-006Katowice, Poland.
  3. 3Faculty of Health Sciences, University of SS Cyril and Methodius, 91701Trnava, Slovakia.
  4. 4Faculty of Natural Sciences, University of SS Cyril and, Methodius, 91701Trnava, Slovakia.
  5. 5Faculty of Chemistry, Wroclaw University of Science Technology, Wybrzeze Wyspianskiego 27, Wroclaw50-370, Poland.
  6. 6Department of Inorganic Chemistry, Faculty of Science, Palacky University, 17. listopadu 12, CZ-779 00Olomouc, Czech Republic.
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Abstract

Two pentacoordinate Mn(II) complexes containing tridentate 2.2'-[oxybis(methylene)] bis(1H-1,3-benzimidazole) (OMeBB) ligand and pseudohalide coligands, [Mn(OMeBB)(NCS)2] (1) and [Mn(OMeBB)(NCO)2] (2), exhibit a very rare {MnIIN4O} coordination mode involving semicoordinate bonds between the ether oxygen atom of the ligand and the Mn(II) center. Susceptibility, magnetization, EPR and ab initio calculations confirm only small magnetic anisotropy. The AC susceptibility measurements reveal field-induced slow magnetic relaxation over the broadest temperature range reported so far for Mn(II) systems, extending up to T ≈ 30 K, with two or three relaxation channels predominantly governed by the direct relaxation mechanism. These results demonstrate that low coordination symmetry and unconventional ligand topology provide an effective approach for tuning magnetic relaxation behavior in quasi-isotropic Mn(II) systems.

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Cite

BibTeXRIS
BibTeX
@article{sawka2026lowering,
  title = {{Lowering Coordination Symmetry as a Strategy for Tuning Slow Magnetic Relaxation in Quasi-Isotropic Mn(II) Systems.}},
  author = {Jacek Sawka and Barbara Machura and Roman Boča and Cyril Rajnák and Maciej Witwicki and Dariusz Bieńko and Pavel Kopel and Alina Bieńko},
  journal = {Inorganic chemistry},
  year = {2026},
  month = oct,
  doi = {10.1021/acs.inorgchem.6c02639},
  url = {https://europepmc.org/article/MED/42916333},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - Lowering Coordination Symmetry as a Strategy for Tuning Slow Magnetic Relaxation in Quasi-Isotropic Mn(II) Systems.
AU  - Jacek Sawka
AU  - Barbara Machura
AU  - Roman Boča
AU  - Cyril Rajnák
AU  - Maciej Witwicki
AU  - Dariusz Bieńko
AU  - Pavel Kopel
AU  - Alina Bieńko
PY  - 2026
DA  - 2026/10/01
JO  - Inorganic chemistry
DO  - 10.1021/acs.inorgchem.6c02639
UR  - https://europepmc.org/article/MED/42916333
AB  - Two pentacoordinate Mn(II) complexes containing tridentate 2.2'-[oxybis(methylene)] bis(1H-1,3-benzimidazole) (OMeBB) ligand and pseudohalide coligands, [Mn(OMeBB)(NCS)2] (1) and [Mn(OMeBB)(NCO)2] (2), exhibit a very rare {MnIIN4O} coordination mode involving semicoordinate bonds between the ether oxygen atom of the ligand and the Mn(II) center. Susceptibility, magnetization, EPR and ab initio calculations confirm only small magnetic anisotropy. The AC susceptibility measurements reveal field-induced slow magnetic relaxation over the broadest temperature range reported so far for Mn(II) systems, extending up to T ≈ 30 K, with two or three relaxation channels predominantly governed by the direct relaxation mechanism. These results demonstrate that low coordination symmetry and unconventional ligand topology provide an effective approach for tuning magnetic relaxation behavior in quasi-isotropic Mn(II) systems.
SN  - 0020-1669
SN  - 1520-510X
ER  -