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(Ln)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 1H & 13C 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 β-diketone and azorhodanine anions in the complexes was characterized by (electronic, infrared and 1H & 13C 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.

Both β-diketonate and azo compound act as bidentate chelating ligands and a square planar geometry around palladium(II) is established forming stable six membered heterocyclic rings.Figure optionsDownload as PowerPoint slideHighlights
► Structure of mononuclear ternary palladium(II) complexes was established.
► 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 were studied.