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表现出磁化强度缓慢弛豫的准各向同性锰及锰配合物家族。

Family of Quasi-Isotropic Mn and Mn Complexes Exhibiting Slow Relaxation of the Magnetization.

作者信息

Pilichos Evangelos, Font-Bardia Mercè, Aullón Gabriel, Mayans Júlia, Escuer Albert

机构信息

Departament de Química Inorgànica i Orgànica, Secció Inorgànica and Institute of Nanoscience and Nanotecnology, Universitat de Barcelona, Marti i Franques 1-11, Barcelona 08028, Spain.

Departament de Mineralogia, Cristal·lografia i Dipòsits Minerals, Universitat de Barcelona, Martí Franqués s/n, 08028 Barcelona, Spain.

出版信息

Inorg Chem. 2024 Oct 28;63(43):20415-20426. doi: 10.1021/acs.inorgchem.4c02826. Epub 2024 Oct 16.

DOI:10.1021/acs.inorgchem.4c02826
PMID:39411954
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11523239/
Abstract

Slow relaxation of magnetization has been studied for a family of mononuclear Mn complexes and one ferromagnetic dinuclear system, all of them presenting very weak anisotropy. Complexes with formula {NiL1Mn(HO)(MeOH)}{NiL1} (), Mn{NiL1} (), Mn{NiL2} (RR-L2, RR, SS-L2, SS), Mn{NiL3} (RR-L3, RR, SS-L3, SS) and (μ-N)[NiMn(L1)(N)] () are derived from compartmental Schiff bases, in which the Ni environment is square planar and thus diamagnetic. All of the systems have been structurally and magnetically characterized. Zero field splitting () values for the Mn cations have been obtained from EPR spectroscopy and NEVPT2 calculations. The slow relaxation of the magnetization for - has been studied by means of ac magnetometry and rationalized on the basis of their low, but not zero, anisotropy, providing the first example of a polynuclear Mn complex, with = 5 ground state, exhibiting slow relaxation.

摘要

对一系列单核锰配合物和一个铁磁双核体系的磁化缓慢弛豫进行了研究，它们均表现出非常弱的各向异性。化学式为{NiL1Mn(HO)(MeOH)}{NiL1} ()、Mn{NiL1} ()、Mn{NiL2} (RR-L2、RR、SS-L2、SS)、Mn{NiL3} (RR-L3、RR、SS-L3、SS) 和 (μ-N)[NiMn(L1)(N)] () 的配合物源自分隔型席夫碱，其中镍的环境为平面正方形，因此呈抗磁性。所有体系均已通过结构和磁性表征。锰阳离子的零场分裂 () 值已通过电子顺磁共振光谱和NEVPT2计算获得。通过交流磁强计研究了 - 的磁化缓慢弛豫，并基于其低但不为零的各向异性进行了合理化解释，这提供了第一个具有5重基态的多核锰配合物表现出缓慢弛豫的例子。

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