13C and 1H-NMR study of some Pt(II) complexes with dithiocarbazic ligands

Pt(II) complexes with singly- and doubly-deprotonated dithiocarbazicligands have been examined by 1H- and 13C-NMR. Complexation induces a deshielding of all the ligand resonances, except that of the thiono carbon. The shielding of C(1) is greater in complexes with singly-deprotonated rather than with twice-deprotonated ligands. The upfield shift may be connected with a decrease of the C?S bond order. The ensemble of the experimental NMR results indicates that considerable differences in bond order, electron density distribution and stereochemistry exist between the complexes with singly- and doubly-deprotonated ligands.