Supramolecular structure and spectral studies on mixed-ligand complexes derived from β-diketone with azodye rhodanine derivatives

A novel method to synthesize some mononuclear ternary palladium(II) complexes of the general formula [Pd(L-n)L] (where LH = diketone = acetylacetone, HLn = azorhodanine) has been synthesize. The structure of the new mononuclear ternary palladium(II) complexes was characterized using elemental analysis, spectral (electronic, infrared and H-1 & C-13 NMR) studies, magnetic susceptibility measurements and thermal studies. The IR showed that the ligands (HLn & LH) act as monobasic bidentate through the azodye nitrogen, oxygen keto moiety and two enolato oxygen atoms. The molar conductivities show that all the complexes are non-electrolytes. Bidentate chelating nature of beta-diketone and azorhodanine anions in the complexes was characterized by (electronic, infrared and & H-1 & C-13 NMR) spectra. Square planar geometry around palladium has been assigned in all complexes. Various ligand and nephelouxetic parameter have been calculated for the complexes. The thermal decomposition for complexes was studied. (C) 2012 Elsevier B.V. All rights reserved.