Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (05): 423-428.doi: 10.3866/PKU.WHXB19960508

• ARTICLE • Previous Articles     Next Articles

A Mechanism Study of Sensitized Photoisomerization of Norbornadiene Derivatives

Wang Xue-Song,Zhang Bao-Wen,Cao Yi   

  1. Laboratory of Photochemistry,Institute of Photographic Chemistry,The Chinese Academy of Sciences,Beijing 100101
  • Received:1995-10-09 Revised:1995-12-13 Published:1996-05-15
  • Contact: Cao Yi

Abstract:

The photoinduced valence isomerizations of three kinds of norbornadiene derivatives were performed under the sensitization of N-methylcarbazole. Fluoresecence quenching, chemically induced dynamic nuclear polarization (CIDNP) and thermodynamic discussion all support a mechanism involving electron transfer. The calculation of quantum yields indicates that the singlet electron transfer makes far more contributions to the photoisomerization than the triplet energy transfer. Additionally, the influence of solvent polarity on the photoisomerizations was also discussed.

Key words: Norbornadiene derivatives, N-methylcarbazole, Photoinduced valence isomerization, Electron transfer, Energy transfer, Effect of solvent polarity