STRUCTURE OF BIS(P-HYDROXOBENZOATO)DI(N,N'-DIETHYLNICOTINAMIDE)-COPPER(II)

The compound Cu(p-OHC6H4COO)2 (DENC)2 (DENC = N,N'-diethylnicotinamide) crystallizes in the orthorhombic system, space group Pbca (No. 61), with unit cell parameters a = 44.966(1) angstrom, b = 16.267(1) angstrom, c = 14.0147(3) angstrom, and Z = 12. The final R value for 5528 independent reflexions is equal to 0.054. Its structure consists of centrosymmetric [Cu(p-OHC6H4COO)2(DENC)2] units and infinite polymer chains, interconnected by hydrogen bonds. Within a monomeric unit, the Cu atom is pseudooctahedrally trans-coordinated by four carboxylic O atoms of two p-hydroxobenzoate ligands [Cu - O bond distances being 1.923 (4) angstrom (2 x) and 2.582 (3) angstrom (2 x), and by two N atoms from two DENC ligands [Cu-N bond distances are 2.050(3) angstrom (2 x)]. Each Cu aton in the chain is hexacoordinated by three carboxylic O atoms from the monodentate and tridentate p-hydroxobenzoates [Cu - O bond distances are 1.929(4) angstrom, 1.962(4) angstrom and 2.652(3) angstrom], by two N atoms from two DENC ligands [Cu - N bond distances are 2.019(3) angstrom and 2.025(3) angstrom] and one hydroxyl O atom of further tridentate p-hydroxobenzoate [Cu - O bond distance is 2.378(3) angstrom].