Copper phosphonates with dinuclear and layer structures: a structural and magnetic study |
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| Authors: | Hong-Chang Yao Song Gao Li-Min Zheng Xin-Quan Xin |
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| Institution: | a State Key Laboratory of Coordination Chemistry, Department of Chemistry, Coordination Chemistry Institute, Nanjing University, Nanjing City, Jiangsu Province 210093, PR China
b State Key Lab of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100870, PR China |
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| Abstract: | Hydrothermal reactions of copper (II) nitrate with 1-hydroxycyclohexanephosphonic acid C6H10(OH)PO3H2] or Δ1-cyclohexenephosphonic acid C6H9PO3H2] have resulted in three new copper phosphonates, namely, Cu(C6H10(OH)PO3)(H2O)2 (1), Cu(C6H10(OH)PO3) (2) and Cu(C6H9PO3)(H2O) (3). Compound 1 has a dinuclear structure in which two {CuO5} square pyramids are bridged by two {CPO3} tetrahedra through corner sharing. The dimers are connected through intermolecular hydrogen bonds, forming supramolecular layers. Both compounds 2 and 3 show layer structures typical for metal mono-phosphonates, in which the inorganic metal-containing layers are separated by cyclohexane or cyclohexene groups. The magnetic studies show that ferromagnetic interactions are mediated between copper centers in compound 1. In compounds 2 and 3, antiferromagnetic interactions are dominant. |
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| Keywords: | Copper Phosphonates Structures 1-hydroxycyclohexanephosphonic Δ1-cyclohexenephosphonic Magnetic properties |
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