Abstract
Hydrothermal reactions of copper (II) nitrate with 1-hydroxycyclohexanephosphonic acid [C 6H 10(OH)PO 3H 2] or Δ 1-cyclohexenephosphonic acid [C 6H 9PO 3H 2] have resulted in three new copper phosphonates, namely, Cu(C 6H 10(OH)PO 3)(H 2O) 2 ( 1), Cu(C 6H 10(OH)PO 3) ( 2) and Cu(C 6H 9PO 3)(H 2O) ( 3). Compound 1 has a dinuclear structure in which two {CuO 5} square pyramids are bridged by two {CPO 3} 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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