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Author Surridge, N. A. ♦ Hupp, J. T. ♦ McClanahan, S. F. ♦ Gould, S. ♦ Meyer, T. J.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY ♦ ORGANIC CHLORINE COMPOUNDS ♦ PHOTOCHEMICAL REACTIONS ♦ ORGANIC SULFUR COMPOUNDS ♦ POLYSTYRENE ♦ EXPERIMENTAL DATA ♦ PHOTOCURRENTS ♦ PHOTOELECTROCHEMICAL CELLS ♦ PHOTOLYSIS ♦ THIN FILMS ♦ CHEMICAL REACTIONS ♦ CURRENTS ♦ DATA ♦ DECOMPOSITION ♦ ELECTRIC CURRENTS ♦ ELECTROCHEMICAL CELLS ♦ EQUIPMENT ♦ FILMS ♦ INFORMATION ♦ MATERIALS ♦ NUMERICAL DATA ♦ ORGANIC COMPOUNDS ♦ ORGANIC HALOGEN COMPOUNDS ♦ ORGANIC POLYMERS ♦ PETROCHEMICALS ♦ PETROLEUM PRODUCTS ♦ PLASTICS ♦ POLYMERS ♦ POLYOLEFINS ♦ POLYVINYLS ♦ SOLAR EQUIPMENT ♦ SYNTHETIC MATERIALS ♦ Photochemistry
Abstract Photocurrents appear upon visible photolysis of thin films of chlorosulfonated polystyrene ((-CH{sub 2}CH(p-C{sub 6}H{sub 4}SO{sub 2}Cl)){sub x}-; PS-SO{sub 2}Cl) containing the chemically attached chromophore ((bpy){sub 2}Ru(5-NH{sub 2}phen))(PF{sub 6}){sub 2} (bpy is 2,2'-bipyridine, 5-NH{sub 2}phen is 5-amino-1,10-phenanthroline). The chemical attachment is by sulfonamide binding. The photocurrents arise following oxidative quenching of the metal-to-ligand charge-transfer excited state(s) of the complex by paraquat (PQ{sup 2+}) in the presence of the reductive scavenger TEOA, triethanolamine. A kinetic model has been derived that accounts for variations in photocurrent with light intensity and (PQ{sup 2+}) or (TEOA) in the external solution. Comparisons with earlier quenching studies obtained by laser flash photolysis show that only a fraction of the chromophores in the film contribute to the photocurrent. The efficiency of photocurrent production depends upon the concentration gradient of the chromophore. It rises initially as the chromophore content increases but falls dramatically in films where the chromophore has reached the electrode-film interface. Under maximal conditions the per photon absorbed quantum yield for photocurrent production reached the electrode-film interface. Under maximal conditions the per photon absorbed quantum yield for photocurrent production reached 0.14, 0.18 with 0.1 M isopropyl alcohol added.
ISSN 00223654
Educational Use Research
Learning Resource Type Article
Publisher Date 1989-01-12
Publisher Place United States
Journal Journal of Physical Chemistry
Volume Number 93
Issue Number 1


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