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Issue 37, 2008
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Copper diphosphonates with zero-, one- and two-dimensional structures: ferrimagnetism in layer compound Cu3(ImhedpH)2·2H2O [ImhedpH4 = (1-C3H3N2)CH2C(OH)(PO3H2)2]

Deng-Ke Cao,a  Xiao-Ji Xie,a  Yi-Zhi Lia  and  Li-Min Zheng*a 
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* Corresponding authors

a State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, Nanjing University, Nanjing, P. R. China
E-mail: lmzheng@nju.edu.cn
Fax: +86-25-83314502.

Abstract

Reactions of CuSO4 with 2-(1-imidazole)-1-hydroxy-1,1′-ethylidenediphosphonic acid (ImhedpH4) under hydrothermal conditions at different temperatures lead to four new metal phosphonates: Cu(ImhedpH3)2(H2O)·2H2O (1), Cu(ImhedpH3)2 (2), Cu3(ImhedpH2)2(ImhedpH3)2·4H2O (3), and Cu3(ImhedpH)2·2H2O (4). Compounds 1 and 2 have mononuclear structures in which the Cu atoms adopt square pyramidal and square planar geometries, respectively. In compound 3, a chain structure is observed where the Cu3(ImhedpH2)2(ImhedpH3)2 trimer units are connected by edge-sharing of the {Cu(2)O5} square pyramids. Compound 4 exhibits a layer structure made up of Cu3(ImhedpH)2 trimer units. The connection of trimers through corner-sharing of {Cu(1)O4} and {CPO3} tetrahedra results in a two-dimensional layer containing 8- and 16-membered rings. The imidazole groups are grafted on the two sides of the layer. Magnetic studies reveal that ferromagnetic interactions are mediated in 3, while for compound 4, ferrimagnetism is observed below 5.8 K.

Graphical abstract: Copper diphosphonates with zero-, one- and two-dimensional structures: ferrimagnetism in layer compound Cu3(ImhedpH)2·2H2O [ImhedpH4 = (1-C3H3N2)CH2C(OH)(PO3H2)2]

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Publication details

The article was received on 07 Apr 2008, accepted on 16 Jun 2008 and first published on 07 Aug 2008


Article type: Paper
DOI: 10.1039/B805487H
Citation: Dalton Trans., 2008,0, 5008-5015
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    Copper diphosphonates with zero-, one- and two-dimensional structures: ferrimagnetism in layer compound Cu3(ImhedpH)2·2H2O [ImhedpH4 = (1-C3H3N2)CH2C(OH)(PO3H2)2]

    D. Cao, X. Xie, Y. Li and L. Zheng, Dalton Trans., 2008, 0, 5008
    DOI: 10.1039/B805487H

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