Accession Number:

ADA250729

Title:

Temperature Dependence of the Inverted Regime Electron Transfer Kinetics of Betaine-30 and the Role of Molecular Modes

Descriptive Note:

Technical rept.,

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF CHEMISTRY

Report Date:

1992-05-18

Pagination or Media Count:

20.0

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 T293K to T34K. 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.

Subject Categories:

  • Organic Chemistry
  • Atomic and Molecular Physics and Spectroscopy
  • Quantum Theory and Relativity
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE