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Abstract
The complex [Ni(HL1)2]Cl2, 1, (HL1 = methyl(2-pyridyl)ketone thiosemicarbazone) has been prepared by reaction of HL1 with nickel(II) chloride and the complex [Ni(L1)NCS], 2, has been prepared by transmetallation of [Pb2(HL1)(L1)(NCS)3] with an excess of nickel(II) chloride. The new complexes have been characterized by spectroscopic techniques and the crystal and molecular structure of [Ni(L1)NCS] has been determined. The nickel atom has square-planar geometry with three donor atoms (NNS) belonging to L1; the fourth coordination site is occupied by an isothiocyanate ion. This results in a planar tricyclic ligating system containing one heterocyclic and two five-membered chelate rings.