PHOTOPHYSICAL PROPERTIES OF NUCLEIC ACID COMPONENTS—II. EFFECT OF N, N'DIMETHYL SUBSTITUTION ON INTERSYSTEM CROSSING IN PYRIMIDINE BASES |
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| Authors: | R. S. Becker,R. V. Bensasson,&dagger C. Salet,&dagger |
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| Affiliation: | *Department of Chemistry, University of Houston, Houston, TX 77004, USA;†Laboratoire de Biophysique, Muséum National d'Histoire Naturelle 61, Rue Buffon, 75005 Paris, France |
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| Abstract: | Abstract— The intersystem crossing quantum yields to the lowest triplet states of N, N'dimethyluracil and N, N'dimethylthymine are 0.02 and ≥0.004, respectively. The very low yields are interpreted in terms of a 1( n , π*) to 1(π.π*) state order change compared with the unsubstituted parents. |
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