Intersystem crossing in the helicenes
โ Scribed by M. Sapir; E.Vander Donckt
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 322 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0009-2614
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๐ SIMILAR VOLUMES
Singlet-triplet intersystem crossing in methylene is considered as a two step process: (a) reversible intramolecular equilibration of singlet and triplet species. and @) collisional deactivation of the vibrationally excited triplet state. The overall process is predicted to be bimolecular. in ngree
A temperature dependent intersystem crossing rate is observed below ca. 170ยฐK for anthracene in methyl tetrahydrofuran. From the temperature dependence of the 0.0 bands in absorption and emission, this is interpreted as being due to slow lattice relaxation in the excited singlet state.
## Intersystem crossing in molecular pairs IS examined in relatron to the structure oi the pair. Simple rclationshlps are derived which differ from previously reported ones by the inclusion of the vrbronic nature of intcrcy\tcm cro\ring.
Intersystem crossing (ISC) of chlorophyll a in solution exhibits a strong solvent dependence and a weak deuterium isatope effect. This is due to the importance of the molecular geometry in promoting ISC. These results are generalized to other closely related photosynthetic pigments