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Syntheses, structures, and magnetic properties of three new MnII–[MoIII(CN)7]4− molecular magnets

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Abstract

By reaction of K4[MoIII(CN)7]·2H2O, Mn(ClO4)2·6H2O and bidentate chelating ligands, three new cyano-bridged compounds, namely Mn2(3-pypz)(H2O)(CH3CN)[Mo(CN)7] (1), Mn2(1-pypz)(H2O)(CH3CN)[Mo(CN)7] (2) and Mn2(pyim)(H2O)(CH3CN)[Mo(CN)7] (3) (3-pypz = 2-(1H-pyrazol-3-yl)pyridine, 1-pypz = 2-(1H-pyrazol-1-yl)pyridine, pyim = 2-(1H-imidazol-2-yl)pyridine), have been synthesized and characterized structurally and magnetically. Single crystal X-ray analyses revealed that although the chelating ligands are different, compounds 1 to 3 are isomorphous and crystallize in the same monoclinic space group C2/m. Connected by the bridging cyano groups, one crystallographically unique [Mo(CN)7]4− unit and three crystallographically unique MnII ions of different coordination environments form similar three-dimensional frameworks, which have a four-nodal 3,4,4,7-connecting topological net with a vertex symbol of {43}{44·62}2{410·611}. Magnetic measurements revealed that compounds 1–3 display long-range magnetic ordering with critical temperatures of 64, 66 and 62 K, respectively. These compounds are rare examples of a small number of chelating co-ligand coordinated [Mo(CN)7]4−-based magnetic materials. Specifically, the bidentate chelating ligands were successfully introduced into the heptacyanomolybdate system for the first time.

Graphical abstract: Syntheses, structures, and magnetic properties of three new MnII–[MoIII(CN)7]4− molecular magnets

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Publication details

The article was received on 12 Apr 2018, accepted on 30 Apr 2018 and first published on 01 May 2018


Article type: Paper
DOI: 10.1039/C8DT01433G
Citation: Dalton Trans., 2018, Advance Article
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    Syntheses, structures, and magnetic properties of three new MnII–[MoIII(CN)7]4− molecular magnets

    X. Wei, Q. Pi, F. Shen, D. Shao, H. Wei and X. Wang, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT01433G

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