Novel Coordination Polymer Containing a Mixed Valence Copper(I,II) Phosphonate Unit:  Cu^I₂Cu^II(hedpH₂)₂(4,4‘-bpy)₂·2H₂O (hedp = 1-Hydroxyethylidenediphosphonate)

Abstract

This paper reports the synthesis and crystal structure of a novel mixed valence copper(I,II) compound, CuI2CuII(hedpH2)2(4,4‘-bpy)2·2H2O (1), where hedp represents 1-hydroxyethylidenediphosphonate. The structure is composed of {CuI2CuII(hedpH2)2} trimer units and 4,4‘-bipyridine linkages, forming a two-dimensional brick-wall-like layer structure in the ab plane. The layers are stacked along the [001] direction with strong interlayer hydrogen bonds and π−π interactions, thus leading to the construction of a three-dimensional network