SYNTHESIS, CHARACTERIZATION AND PHYSICOCHEMICAL STUDIES OF SOME COPPER(II) TETRATHIOCYANATO-DITHALLATE(I) COMPLEXES WITH HYDRAZIDES AND HYDRAZONES

Copper(II) complexes of the type Cu[T1(SCN)2]2.L [where L = benzoic hy drazide (BH), isonicotinic hydrazide (INH), salicylic hydrazide (SH), anthranilic hydrazide (AH), p-hydroxybenzoic hydrazide (PHBH), p-amino benzoic hydrazide (PABH) and their isopropanone derivatives, i.e. isop ropanone benzoylhydrazone (IBH), isopropanone isonicotinoyl hydrazone (IINH), isopropanone salicyloylhydrazone (ISH) and isopropanone anthra noylhydrazone (IAH)] were synthesized and characterized. All the compl exes are non-electrolytes, and dissociate in H2O, C2H5OH, CH3CN and CH 3COCH3. They are either coordinated through C=O and -NH2 groups of the hydrazide or C=O and C=N of the hydrazone ligands. The electronic and ESR spectra suggest a planar geometry for Cu[TI(SCN)2]2 and a tetrago nally distorted octahedral structure for all other complexes. The X-ra y diffraction parameters for some of the complexes correspond to a tet ragonal crystal lattice.