Abstract
The treatment of 3-ammonium-1-hydroxypropylidene-1,1′-bisphosphonate (H7ahdp) and 4,4′-bipy with CuCl2 · 2H2O resulted in a metal phosphonate [Cu(H5ahdp) · H2O] n . Its crystal structure has been characterized by single X-ray crystallography. Although there is no 4,4′-bipy in the lattice structure, it plays a very important role in forming the one-dimensional chain of the polymer. Hydrogen bonds link the chains into a 3D network. The dinuclear secondary building units are observed in the compound. The determination of variable-temperature magnetic susceptibilities (5 ∼ 300 K) shows weak intrachain antiferromagnetic coupling between copper(II) centers. The magnetic data were fitted to the appropriate equations derived from the Hamiltonian H = −2JS 1 S 2, giving the parameter J = −25.78 cm−1. Its thermal properties were also investigated.
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