Photoresponse of platinum electrodes coated by electropolymerized polypyridyl complexes of ruthenium(II)-containing pyrrole groups in the presence of an external quencher. Film thickness effect

Visible photolysis of Pt electrodes coated by oxidatively electropolymerized polypyridyl complexes of ruthenium(II)-containing pyrrole groups give appreciable cathodic photocurrents when irradiated in the presence of 4-methylbenzenediazonium tetrafluoroborate (4-CH3C6H4N2 BF4 ) in acetonitrile. Film thickness studies reveal that the beneficial effect on the photocurrent intensity brought by increasing film thickness is rapidly cancelled by the resulting electron diffusion limitation. 21 references, 3 figures.