CRYSTAL AND MOLECULAR-STRUCTURE OF YDROXYETHYL)SALICYLIDENEIMINATO-N,O,O'-COPPER(II)] HEMIHYDRATE

The structure of the title compound, [Cu2Cl2(C9H10NO2)2].1/2H2O, has b een determined from single crystal X-ray diffraction data. The structu re was solved by direct methods. Full-matrix least-squares refinement of structural parameters led to a conventional R factor of 0.056 for 3 689 intensities above 3sigma(I). There are two independent molecules [ A and B] of the title compound in the asymmetric unit. These molecules are linked to one water molecule by a system of four hydrogen bonds. The complexes contain pairs of deformed square-pyramidal copper(II) ce nters. A tridentate ligand L forms two condensed chelate rings with me an Cu-O((C=O)) = 1.900(6), mean Cu-O((C-OH)) = 2.004(6) and mean Cu-N = 1.930(6)angstrom. A chloride ions complete the tetrahedral distorted basal plane of each Cu(II) ion forming a square pyramid with the long er fifth apical Cu-Cl bridging bond. The Cu ... Cu nonbonding distance s in the complexes are 3.445(1)angstrom for molecule A and 3.494(1)ang strom for molecule B.