Synthesis, crystal structures and spectrothermal characterization of a heptacoordinated dimeric salicylato cadmium(II) complex with 2,2¨-Azobispyridine (abpy), (µ-abpy)[Cd(Hsal)2(abpy)] 2

Abstract

µ-2,2'-Azobispyridinebis[2,2'-azobispyridinesalicylato(O) -salicylato(O,O') cadmium(II)], (µ-abpy)[Cd(Hsal)2(abpy)] 2 (I) was synthesized and characterized by IR and UV/Vis spectroscopy, thermal, analysis, and X-ray diffraction techniques. Two abpy ligands and two salicylate ligands coordinate to the Cd2+ ion in a monocapped trigonal-prismatic arrangement. The capping atom is the N3 atom. One of the two abpy ligands behaves as a "s-frame" bridging ligand and adopts a s-cis/E/s-cis conformation, whereas the other one adopts as a s-cis/E/s-trans conformation. One of the two salicylate ligands acts as a monodentate ligand, which coordinates with the carboxylate oxygen atom, whereas the other one adopts bidentate coordination through two carboxylate oxygen atoms. The hydroxy groups of salicylate ligands, which coordinate in a monodentate fashion, are disordered over two positions, with, occupancies of 0.52 for group A and 0.48 for group B. The decomposition reaction takes place in the temperature range 20-1000 °C under nitrogen. Thermal decomposition of the title complex proceeds in two stages. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.