Photochemical Transients of Electrode Bound Methylene Blue

摘要

A 520 nm transient was observed as the result of the interaction of methylene blue triplet with methylene blue bound to an electrode surface. The transient was observed by laser flash photolysis in an outgassed thin layer transparent electrochemical cell filled with a solution of .001 M methylene blue and 0.1M KCl in 50% aqueous methanol or 50% aqueous acetonitrile. The 520 nm transient is observed after application of an anodic potential of 0.1V to 0.7V vs Ag/AgCl for a few seconds on a Pt, Au or SnO2 electrode. The results indicate that methylene blue triplet is the precursor of the species associated with the 520 nm transient and this transient involves interaction of the triplet with electrodeposited dye. (Author)