Preparation spectroscopy and conductivity of [Pt(SS)(NN)]-type complexes and their iodine oxidized complexes

Complexes of the general formula [Pt(SS)(NN)] have been prepared, where SS is bbdt(1,2-bis(benzylthio)ethylene-1,2-dithiolate) or dpdt (5,6-dihydrophe nyl-1,4-dithion-2,3-dithiolate) and NN is bipy (2,2'-bipyridine) or phen (1 ,10-phenanthroline). The UV-Vis spectra exhibit intense intramolecular liga nd-to-ligand charge transfer absorption bands at 440-600 nm. Cyclic voltamm ograms show a reversible oxidation step assigned to [Pt(SS)(NN)](0)/[Pt(SS) (NN)](+). On doping iodine into the complexes, partial oxidation occurs to afford [Pt(SS)(NN)I-x (x=1.9(2.2). IR, Raman and ESR spectra of the iodine- doped complexes are discussed. Electrical conductivities of the neutral mix ed-ligand complexes (10(-9)-10(-10) S cm(-1)) increase to 10(-6)-10(-7) S c m(-1) upon It doping. (C) 1999 Elsevier Science S.A. All rights reserved.