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Synthesis, structures and magnetism of heterotrimetallic Ni–Cu–Ln complexes based on a dicompartmental imine–oxime ligand

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Abstract

Four NiII–CuII–LnIII heterotrimetallic complexes [Ni(MeOH)(HL)Cu(MeOH)]2[Ln(dbm)4]2·xCH3OH·yH2O (Ln = Gd, x = 4, y = 2 for 1, Ln = Tb, x = 6, y = 0 for 2, Ln = Dy, x = 6, y = 0 for 3, Ln = Ho, x = 6, y = 0 for 4, respectively, H4L = N,N-bis(2-hydroxy-3-hydroxyiminomethyl-5-methylphenylmethylene)-1,3-propanediamine, dbm = anion of 1,3-diphenyl-propane-1,3-dione) have been synthesized. Structural analyses reveal that in all complexes, NiII and CuII ions are embedded in the dicompartmental imine–oxime ligand of HL to form a [Ni(MeOH)(HL)Cu(MeOH)]+ cation, and the cation itself dimerizes via two oxime oxygen atoms coordinated to Ni(II) ions to form a centrosymmetric tetranuclear cluster of [Ni(MeOH)(HL)Cu(MeOH)]22+. LnIII ions are coordinated by four dbm anions to form a [Ln(dbm)4] unit as a balance anion. Magnetic susceptibility measurements show that strong antiferromagnetic couplings are operative between NiII and CuII ions by phenolate and oximato bridges. Ac susceptibility measurements under zero dc-applied field disclose that the Dy derivative behaves as a SMM with a small effective energy of 0.78 K.

Graphical abstract: Synthesis, structures and magnetism of heterotrimetallic Ni–Cu–Ln complexes based on a dicompartmental imine–oxime ligand

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Publication details

The article was received on 02 Jun 2017, accepted on 22 Aug 2017 and first published on 22 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ01955F
Citation: New J. Chem., 2017, Advance Article
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    Synthesis, structures and magnetism of heterotrimetallic Ni–Cu–Ln complexes based on a dicompartmental imine–oxime ligand

    Z. Zhu, L. Cai, X. Deng, Y. Zhou and M. Yao, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ01955F

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