(L)PtMen where n = 2, 4; L = mmb = 1-methyl-(2-methylthiomethyl)-1H-benzimidazole, mtb = 1-methyl-(2-tert-butylthiomethyl)-1H-benzimidazole were characterized by x-ray crystallog. except for (mmb)PtMe2 and by 1H and 195Pt NMR spectroscopy. The tetramethylplatinum(IV) complexes exhibit a variable degree of dynamic 1H NMR behavior due to the mobility at the thioether S atom in the nonplanar five-membered chelate ring, as supported by structural anal. D.-functional theory (DFT) calcns. were used to reproduce the structural features and the 1H NMR chem. shifts. In comparison with other late transition metal complexes of these N-S chelate ligands the Me4Pt and esp. the Me2Pt compds. exhibit a relatively stronger preference of the metal for the S donor. on SciFinder(R)
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