METAL COMPLEXES AS PHOTOSENSITIZERS AND RELAYS FOR THE REDOX DECOMPOSITION OF WATER
New redox photosensitizers have been developed, among them several metal 8-hydroxy-quinoline complexes. Some of these are excellent excited state reductants, with prominent visible absorptions, lifetimes in fluid solution in the microsecond range, and excited state potentials around -1V vs. SCE. These photosensitizers are ideal for adsorption onto colloidal semiconductor particles. When used with Graetzel's bifunctional catalysts, they give rise to very efficient hydrogen production in sacrificial systems. A strategy has been also devised for the construction of bimetallic photosensitizers aimed at enhancing charge separation, based on the Ru(bpy)-2(CN)-2 chromophore. The search for new, inorganic, relay species resistant to catalytic hydrogenation has also been pursued. Caged metal ions have been shown to be excellent in this regard. The problem of cage escape in photochemical electron transfer reactions has been tackled on fundamental grounds. Effects of product charge type, distortional barriers, non-adiabaticity have been studied in order to rationalize available yields and arrive at the design of new high efficiency cycles.
Bibliographic Reference: EUR 9477 EN (1984) MF, 29 P., BFR 120, BLOW-UP COPY BFR 150, EUROFFICE, LUXEMBOURG, POB 1003
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Record Number: 1989123100200 / Last updated on: 1987-01-01
Available languages: en