Temperature Dependence of the Inverted Regime Electron Transfer Kinetics of Betaine-30 and the Role of Molecular Modes
Abstract
The inverted regime photoinduced electron transfer kinetics of betaine-30 have been investigated over a broad temperature range, revealing very little temperature dependence. For example, for betaine-30 in a polystyrene film, the electron transfer rate constant, k ET' changes by less than a factor of 3 from T=293K to T=34K. The results are in striking contrast to predictions of contemporary electron transfer theories which employ classical nuclear modes to accept some or all of the energy of the electron transfer event. The comparison of theory and experiment for the betaines demonstrates that a full quantum mechanical theory is necessary to accurately describe the electron transfer kinetics of the betaines in environments with slow dielectric relaxation . The conclusions drawn for the betaines may also apply to other molecular examples of inverted regime electron transfer in slowly relaxing environments.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 18, 1992
- Accession Number
- ADA250729
Entities
People
- Alan E. Johnson
- Eva Akesson
- Gilbert C. Walker
- Nancy E. Levinger
- Thomas P. Dubruil
Organizations
- University of Minnesota