A Multinuclear NMR Study of Platinum(II) Complexes ofN-Phenyl andN-(3-Allyl) Substituted 2-(2-Pyridinemethylene) Hydrazine Carbothioamides

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Abstract
Jeutral platinum(II) complexes of type [Pt(LH)Cl], where LH− denotes the N-phenyl and N-allyl-2-(2-yridineraethylene)hydrazine carbothioamide anion, have been prepared and characterized. These com-lexes, as well as the hydrochloride salts of these ligands, have been examined in DMSO-d 6 solution by H, 13C and 195Pt NMR spectroscopy. From the observed chemical shift, the 195Pt-1H and 195Pt-13C oupling constant trends, the mode of coordination of Pt(II) to these ligands has been deduced to be via he thiocarbonyl atom, the pyridyl N(3) and hydrazinic N(2) nitrogen atoms respectively. In these omplexes the resolved 195Pt-13C coupling constants to the carbon atoms of the pyridyl group of the gand follow the order 2J > 3J > 4J, in contrast to trends observed for other simple Pt(II) complexes ivolving a coordinated pyridine molecule. Indications are that in DMSO solution, the complexes Pt(LH)Cl] undergo some solvolysis to yield [Pt(LH)DMSO]+CP.