Synthesis, Crystal Structure and Spectroscopic Properties of an Oximato Bridged Cu(II) Dimer (original) (raw)

Schiff-base condensation of a equimolar proportion of diacetyl-monoxime monohydrazone and 1-methylimidazole-2-carboxaldehyde in methanol gives rise to the imidazole azine, 3-(1-methylimidazol-2-yl)methylenehydrazonobutan-2-one oxime(HL). Reaction of 1:1 stoichiometric proportion of HL with copper(II)perchlorate hexahydrate in methanol yields a dimeric oximato bridged copper compound, [Cu 2 L 2 (H 2 O) 2 ](ClO 4 ) 2 (1). The compound is characterized by C, H and N analyses, FT-IR, ESI-MS, conductivity measurement, UV-Vis spectra and X-ray single crystal diffraction. The title compound (1) crystallizes in the monoclinic space group P2 1 /c with a = 6.8533 (8), b = 18.413 (2), c = 11.7399 (14) Å , b = 93.685 (2)°, V = 1478.4 (3) Å 3 and Z = 2. The geometry around each copper center is distorted square pyramidal. The copper(II) dimer shows antiferromagnetic interaction mediated by symmetric disposition of oximato groups.