Crystal and molecular structure of bis(2,6-dimethanolpyridine)copper(II)niflumate

Bis(2,6-dimethanolpyridine)copper(II)niflumate has been prepared and studied by single-crystal Xray diffraction methods at 293(2) K. The complex is noncentrosymmetric, with the two 2,6-dimethanolpyridine molecules symmetrically coordinated to the copper(II) atom in a tridentate chelating manner making up an ''all-trans'' elongated octahedral arrangement. In consequence of Jahn-Teller distortion, considerable differences are found between them: for one 2,6-pyme ligand Cu-N is 1.919(5), Cu-O 2.210(4) and 2.244(4) Angstrom, while for the other the values are 1.891(5), 2.074(4) and 2.101(4) Angstrom. The data are compared and discussed with those found in familiar CuL2 compounds with the CuO4N2 chromophore. (C) 1997 Published by Elsevier Science Ltd.