CRYSTAL-STRUCTURE AND PROPERTIES OF A POLYMERIC CHAIN COPPER(II) COMPLEX [CU(BPC)(H2O)2] (BPC = 2,2'-BIPYRIDYL-3,3'-DICARBOXYLATE)

The complex formulated as [Cu(bpc)(H2O)2] (bpc = 2,2-bipyridyl-3,3'-di carboxylate) has been prepared. A single crystal structure revealed th at it consists of polymeric chains of [Cu(bpc)(H2O)2] Units. Each copp er(II) ion pair is bridged by a bpc dianion in a tridentate fashion th rough its two pyridine nitrogen atoms and one carboxylate oxygen atom. Each copper(II) ion has a distorted square-pyramidal environment: the equatorial positions are occupied by two nitrogen atoms of a bpc liga nd and an oxygen atom of another bpc ligand and an oxygen atom of a wa ter molecule, and the apical position by an oxygen atom of another wat er molecule. The three non-coordinated carboxylate oxygen atoms of the bpc ligand are all hydrogen-bonded with a coordinated water molecule. The IR spectra are discussed with the structure. The magnetic suscept ibility has been measured in the range 7-300 K and obeys the Curie-Wei ss law I/chi(m) = C(T-theta) with theta = -1.24 K, suggesting a very w eak antiferromagnetic interaction between the copper(II) ions.