SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF BIS-COMPLEXES OF COBALT(II), NICKEL(II) AND COPPER(II) WITH N,N,N'N'-TETRAETHYLPYRIDINECARBOXAMIDE

Bis-complexes of Co(II), Ni(II) and Cu(II) with tedpa (N,N,N'N'-tetrae thylpyridinedicarboxainide) having the general formula [M(tedpa)2]X2(X = ClO4, PF6) have been synthesized and characterised by i.r., electro nic and e.p.r. spectra. The spectroscopic results suggest that the ted pa acts in these compounds as tridentate ligand through two oxygen ato ms and a nitrogen (from the pyridine ring) atom. A distorted octahedra l environment (MN2O4 chromophores) for the metal atoms is inferred fro m the spectroscopic data.