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Solvent polarity effects on intramolecular electron transfer: An estimate of activation entropies

✍ Scribed by H. Heitele; F. Pöllinger; S. Weeren; M.E. Michel-Beyerle

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
538 KB
Volume
168
Category
Article
ISSN
0009-2614

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✦ Synopsis

Electron-transfer rates were determined in solvents of different polarity as a function of temperature and analyzed in terms of activation energies and pre-exponential factors. Both were found to depend on the polarity of the solvent. The solvent dependence of the pre-exponential factor is interpreted as evidence for different activation entropies due to sizable reaction and (possibly) reorganization entropies. Theoretical estimates of differences in the activation entropies taking account of temperaturedependent reaction free energies and solvent reorganization energies are in qualitative agreement with the experiments.

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