19582-32-2Relevant academic research and scientific papers
Electrochemical and ESR studies of the redox reactions of nickel(II), palladium(II), and platinum(II) complexes of 1,2-diphenyl-1,2-ethenedithiolate(2-)-S,S′
Bowmaker, Graham A.,Boyd, Peter D. W.,Campbell, Graeme K.
, p. 1208 - 1213 (2008/10/08)
The electron spin resonance (ESR) spectra of the one-electron-reduction products of the 1,2-diphenyl-1,2-ethenedithiolate complexes M(Ph2C2S2)2 (M = Ni, Pd, Pt) support the view that these reductions are mainly ligand based. Dc cyclic voltammetric studies of the above complexes also show an apparently quasi-reversible oxidation process in each case. ESR studies indicate that several species with slightly differing g values are formed in this process under the longer time scale of controlled-potential electrolysis. The 1,2-diphenyl-1,2-ethenedithiolate(2-)-S,S′ complexes M(dpe)(Ph2C2S2) (M = Ni(II), Pd(II), Pt(II); dpe = 1,2-bis(diphenylphosphino)ethane) and M(PPh3)2(Ph2C2S2) (M = Pd(II)) were prepared, as described by previous workers, by ligand substitution reactions between the metal dithiolene complexes and the appropriate phosphine ligand. Ni(dpe)(Ph2C2S2) undergoes a reversible one-electron reduction to the corresponding nickel(I) complex and a reversible one-electron oxidation to give a long-lived species that is characterized by ESR spectroscopy as a complex of the previously unknown dithioketyl (Ph2C2S2)-·. The palladium and platinum 1,2-diphenyl-1,2-ethenedithiolate(2-)-S,S′ complexes do not undergo reversible reduction but like the above nickel complex undergo reversible oxidation to give dithioketyl complexes.
