Copper(ll), Nickel(II) and Cobalt(II) Complexes of Biacetyl Thiosemicarbazone and Biacetyl-(4-Phenyl)-Thiosemicarbazone

Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Calcutta-700 032

Manuscript received 9 September 1980, revised 26 March 1981, accepted 13 .April 1981

Cu(II), Ni(II) and Co(II) complexes of the multidentate ligands biacetyl thio­semicarbazone and biacetyl-(4-phenyl)-thiosemicarbazone (LH₂ and L₁H₂) in the enol form have been synthesised. The complexes have the general formula ML.nH₂O and ML₁.nH₂O [M=Cu(II), Ni(II) and Co(II) and n=0-2]. A number of mixed-ligand complexes have also been synthesised. These were of the type ML(B)₂ and ML₁(B)₂, (where B= py, 2-pic, 3-pic and 4-pic). These complexes have been characterised by elemental analyses, magnetic moment values, visible and infra-red spectra. The bonding sites and the geometry of the ligand environment around the metal ion have been discussed in the light of the physicochemical data obtained