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Issue 7, 2018
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Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(II) complex

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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 and crystallized in the monoclinic crystal system with the 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 the formation of a two-dimensional (2D) sheet in which Co(II)/Fe(II) ions are spatially separated from each other. The study of their magnetism reveals that compound 1 presents an easy-plane magnetic anisotropy (D = +3.47 cm−1). Alternating current dynamic susceptibility measurements show that compound 1 exhibits field-induced slow relaxation of the magnetization with an effective energy barrier value of 48.49 K.

Graphical abstract: Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(ii) complex

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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, 2018,20, 962-968
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    Field-induced slow relaxation of magnetization in a distorted octahedral mononuclear high-spin Co(II) complex

    H. Wei, Q. Yang, X. Lai, X. Wang, T. Yang, Q. Hou and X. Liu, CrystEngComm, 2018, 20, 962
    DOI: 10.1039/C7CE01981E

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