Nickel(II), copper(II), palladium(II) and platinum(II) complexes of bidentate SN ligands derived from S-alkyldithiocarbazates and the X-ray crystal structures of the [Ni(tasbz)(2)] and [Cu(tasbz)(2)]center dot CHCl3 complexes

New complexes of general empirical formula, [M(NS)(2)] . nCHCl(3) (M = Ni-I I, Cu-II, Pd-II or Pt-II; NS = anionic form of the thiophene-2-aldehyde Sch iff bases of S-methyl- and S-benzyldithiocarbazate; n = 0, 1) have been syn thesized and characterized by physico-chemical techniques. Magnetic and spe ctroscopic evidence support a square-planar structure for these complexes. The crystal structures of the [Ni(tasbz)(2)] and [Cu(tasbz)(2)] . CHCl3 com plexes (tasbz = anionic form of the thiophene-2-aldehyde Schiff base of S-b enzyldithiocarbazate) have been determined by X-ray diffraction. Both compl exes have a trans-planar structure in which the two Schiff base ligands are coordinated to the metal(II) ion as uninegatively charged bidentate ligand s via the thiolate sulfur and the azomethine nitrogen atoms.