Copper(II) and cobalt(II) complexes of methyl 2-pyridyl ketone thiosemicarbazone (HL); single-crystal structure of [Cu(HL)L]NCS

Abstract

The complexes [M(HL)L]ClO₄(HL = methyl 2-pyridyl ketone thiosemicarbazone; M = Cu 1 or Co 2) have been prepared from the reaction of HL with the appropriate perchlorate salt; [Cu(HL)L]NCS 3 was also prepared by transmetallation of [Pb₂(HL)L(NCS)₂]NCS with an excess of copper(II) perchlorate. The new complexes have been characterized by spectroscopic techniques and the crystal structure of 3 has been determined: green triclinic crystal, a= 10.150(2), b= 10.350(2), c= 11.890(2)Å, α= 88.55(3), β= 83.28(3), γ= 63.26(3)°, space group P, Z= 2. The copper atom is six-co-ordinated by two NNS donor sets from terdentate ligands.