Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. [Annual] Progress Report, August 1, 1989--July 31, 1992
Title | Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. [Annual] Progress Report, August 1, 1989--July 31, 1992 PDF eBook |
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Pages | 19 |
Release | 1992 |
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Conventional and fast-kinetics techniques of photochemistry, photophysics, radiation chemistry, and electrochemistry were used to study the intermediates involved in transition metal excited-state electron-transfer reactions. These intermediates were excited state of Ru(II) and Cr(III) photosensitizers, their reduced forms, and species formed in reactions of redox quenchers and electron-transfer agents. Of particular concern was the back electron-transfer reaction between the geminate pair formed in the redox quenching of the photosensitizers, and the dependence of its rate on solution medium and temperature in competition with transformation and cage escape processes. (DLC).
Energy Research Abstracts
Title | Energy Research Abstracts PDF eBook |
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Pages | 654 |
Release | 1993 |
Genre | Power resources |
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Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. Progress Report, August 1, 1989--December 31, 1991
Title | Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. Progress Report, August 1, 1989--December 31, 1991 PDF eBook |
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Pages | 19 |
Release | 1991 |
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During this period, conventional and fast-kinetics techniques of photochemistry, photophysics, radiation chemistry, and electrochemistry were used for the characterization of the intermediates that are involved in transition metal excited-state electron-transfer reactions. The intermediates of interest were the excited states of Ru(II) and Cr(III) photosensitizers, their reduced forms, and the species formed in the reactions of redox quenchers and electron-transfer agents. Of particular concern has been the back electron-transfer reaction between the geminate pair formed in the redox quenching of the photosensitizers, and the dependence of its rate on solution medium and temperature in competition with transformation and cage escape processes.
Study of Intermediates from Transition Metal Excited-state Electron- Transfer Reactions. Progress Report, January 1, 1992--March 31, 1993
Title | Study of Intermediates from Transition Metal Excited-state Electron- Transfer Reactions. Progress Report, January 1, 1992--March 31, 1993 PDF eBook |
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Pages | 5 |
Release | 1993 |
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Progress on 6 projects is reported: excited state absorption spectrum of Ru(bpy)3{sup 2+}, solvent cage model for electron transfer quenching, reductive quenching of {sup *}Cr(III) complexes, solution medium effects in oxidative quenching of {sup *}Ru(II) complexes, photosensitized oxidation of phenol in aqueous solution, and quenching of Ru(II) complexes by oxygen.
Government Reports Annual Index
Title | Government Reports Annual Index PDF eBook |
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Pages | 1190 |
Release | 1994 |
Genre | Research |
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Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. Final Report, August 4, 1986--August 31, 1997
Title | Study of Intermediates from Transition Metal Excited-state Electron-transfer Reactions. Final Report, August 4, 1986--August 31, 1997 PDF eBook |
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Pages | 31 |
Release | 1997 |
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The techniques of continuous photolysis and pulsed laser flash photolysis, continuous and pulse radiolysis, fast-scan cyclic voltammetry, and time-resolved fluorimetry have been used to examine intramolecular electron transfer within the solvent quenching cage, photodynamics of quenching of the excited states of transition-metal photosensitizers, the properties of excites states and one-electron reduced forms, ground- and excited-state interactions with solutes, and photoinduced oxidations of organic solutes in aqueous solution. The following specific areas were examined: (1) the parameters that govern the yields of redox products from excited-state electron-transfer quenching reactions; (2) the mediation of the properties of excited states and one-electron reduced forms by the ligands and the solution medium; (3) the effect of the interactions between the ground state of the complex and the solution components on the behavior of the excited state; (4) the yields of singlet oxygen from excited-state energy-transfer quenching by O2; and (5) the oxidations of solutes by singlet oxygen, excited-state electron-transfer quenching, and free radicals. This report contains the abstracts of 50 publications describing the studies.
Study of Intermediates from Transition Metal Excited-state Electron- Transfer Reactions
Title | Study of Intermediates from Transition Metal Excited-state Electron- Transfer Reactions PDF eBook |
Author | |
Publisher | |
Pages | 5 |
Release | 1993 |
Genre | |
ISBN |
Progress on 6 projects is reported: excited state absorption spectrum of Ru(bpy)[sub 3][sup 2+], solvent cage model for electron transfer quenching, reductive quenching of [sup *]Cr(III) complexes, solution medium effects in oxidative quenching of [sup *]Ru(II) complexes, photosensitized oxidation of phenol in aqueous solution, and quenching of Ru(II) complexes by oxygen.