Transient storage of photochemically produced oxidative and reductive equivalents in soluble redox polymers
Optical excitation and electron-transfer quenching of the metal to ligand charge-transfer (MLCT) excited state(s) of ((5-NH/sub 2/-phen)Ru(bpy)/sub 2/)/sup 2 +/ occur in solutions containing polystyrene polymers in which either pendant paraquat (PQ/sup 2 +/) or phenothiazine (PTZ) sites are attached...
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Veröffentlicht in: | J. Phys. Chem.; (United States) 1986-02, Vol.90 (5), p.728-730 |
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Sprache: | eng |
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Zusammenfassung: | Optical excitation and electron-transfer quenching of the metal to ligand charge-transfer (MLCT) excited state(s) of ((5-NH/sub 2/-phen)Ru(bpy)/sub 2/)/sup 2 +/ occur in solutions containing polystyrene polymers in which either pendant paraquat (PQ/sup 2 +/) or phenothiazine (PTZ) sites are attached. The quenching and subsequent electron-transfer steps lead to the appearance of -PQ/sup +/ and -PTZ/sup +/ on separate polymers. Since electron transfer between -PQ/sup +/ and -PTZ/sup +/ sites on separate polymers is slow, the lifetime of the photochemically produced oxidative and reductive equivalents is enhanced by approx.10/sup 3/ compared to related monomeric quenchers under similar conditions. 7 references, 1 figure. |
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ISSN: | 0022-3654 1541-5740 |
DOI: | 10.1021/j100277a007 |