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Field-Induced Slow Relaxation of the Magnetization in a Distorted Octahedral Mononuclear High-Spin Co(II) Complex

Abstract

In this study, we report the syntheses and structures of two new mononuclear coordination complexes ([Co(H2pimdc)2(phen)]n (1) and [Fe(H2pimdc)2(phen)]n (2), H2pimdc = 2-propyl-imidazole-4, 5-dicarboxylate, phen = 1, 10-Phenanthroline monohydrate) exhibiting single-ion magnet (SIM) behavior. Single-crystal X-ray diffraction analyses reveal that 1 and 2 are isomorphic, crystallized in the monoclinic crystal system with P21/n space group. In both structures, the Co(II)/Fe(II) centers adopt distorted octahedral {Co/FeN4O2} geometries. In addition, the mononuclear structures of 1 and 2 are linked by strong intermolecular N−H···O hydrogen bonds, leading to form a two-dimensional (2D) sheet in which Co(II)/Fe(II) ions are spatially separated from each other. The study of magnetism reveals that compound 1 presents an easy-plane magnetic anisotropy (D = +3.47 cm-1). Alternating current dynamic susceptibility measurements show that 1 exhibits field-induced slow relaxation of the magnetization with effective energy barrier value of 48.49 K.

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Publication details

The article was received on 14 Nov 2017, accepted on 06 Jan 2018 and first published on 08 Jan 2018


Article type: Paper
DOI: 10.1039/C7CE01981E
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Field-Induced Slow Relaxation of the Magnetization in a Distorted Octahedral Mononuclear High-Spin Co(II) Complex

    H. W. Wei, Q. F. Yang, X. Lai, X. Z. Wang, T. L. Yang, Q. Hou and X. Liu, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C7CE01981E

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