Synthesis and characterization of tetrakis-μ-2-[(2,6dichlorophenyl) amino] benzeneacetodiaquodicopper(II) dihydrate and tetrakis-μ-2-[(2,6dichlorophenyl)amino]benzeneaceto dimethylformamidodicopper(II)

Abstract

Complexes of diclofenac (L), [CuL 2(H 2O)] 22H 2O, and [CuL 2(DMF)] 2 were prepared by the reaction of the sodium salt of this potent antiinflammatory drug with CuCl 2. The new symmetric binuclear copper(II) complex [CuL 2(DMF)] 2 crystallizes in the monoclinic space group P2 1/n with cell constants a = 10.807(1), b = 15.429(2), c = 19.360(2), β = 92.508(3), V = 3225(1) A ̊ 3, and Z = 2 . The structure was determined from 5456 out of a total of 5768 unique reflections. The final values for R 1, wR 2, and GOF for all data are 0.0602, 0.1066, and 1.030, respectively. The crystal structure consists of a binuclear quadruply bridged neutral molecule. The four carboxylato groups from four ligands are in the familar bidentate syn,syn η 1: η 1: μ 2 bridging mode. The metal coordination geometry is described as a perfect square bipyramid with a water or dimethyloformamide oxygen occupying both apical positions. Optical, infrared, electron paramagnetic resonance, magnetic, and electrochemical properties of these complexes are also reported.