SS-Bipy

Subsequently, Taniguchi and co-workers found (13) that bis(4-pyridyl)disulfide (SS-Bipy) adsorbed so strongly on gold that a predip in the SS-Bipy solution for several minutes was sufficient to give excellent electrochemistry of cytochrome c in a promoter-free solution. However, the adsorption behavior of this promoter was interpretated by the Frumkin isotherm rather than by the Langmuir isotherm. As... 

Reduced forms of the complexes shuttled electrons from DNA to the electrode, where the oxidized form was electrochemically regenerated. Using this effect, Johnston and coworkers [329] studied solvent accessibility of nucleobases in ss and duplex DNA. Formation of DNA duplex precluded direct collision of [Ru(bipy)3] +, with the G residue and the electrons had to tunnel through a finite distance. This distance was lower when G was in a mismatch and the oxidation rate followed the trend G (single-strand) > GA >... 

PtCl2(QH4Xbipy)] decomposes to four-co-ordinate [PtCl2(bipy)] and ethylene via two different pathways depending on the solvent. A simple, first-order, one-step process is observed in 1,2-dichloroethane with = 18.6(0.6) kcal mol and sS = — 8(2) cal mol and a simple ligand-dissociative pathway seems probable. 

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