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The energy balance of photoinduced electron transfer reactions

Authors
Journal
Journal of Photochemistry and Photobiology A Chemistry
1010-6030
Publisher
Elsevier
Publication Date
Volume
49
Identifiers
DOI: 10.1016/1010-6030(89)87121-7
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract The energy balance of a photoinduced electron transfer reaction is given by the Rehm-Weller equation which combines the oxidation potential E ox(D) of the electron donor, the reduction potential E red(A) of the electron acceptor, an electrostatic correction term C and the excited state energy of the light-absorbing species: It is shown that if light carries a thermodynamic entropy the excitation energy term must be given by η E*, η being the efficiency of the conversion of the energy of light into chemical free energy. Measurements of fluorescence quenching through electron transfer at very low light intensities show that the Rehm-Weller equation remains valid in spite of its implied assumption that η = 1; it is concluded that contrary to much current thinking light is a form of high grade energy which can be converted in principle entirely into chemical free energy and electrical energy.

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