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PHOTOPHYSICAL PROPERTIES OF NUCLEIC ACID COMPONENTS—II. EFFECT OF N, N'DIMETHYL SUBSTITUTION ON INTERSYSTEM CROSSING IN PYRIMIDINE BASES
Author(s) -
Becker R. S.,
Bensasson R. V.,
Salet C.
Publication year - 1981
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1981.tb04306.x
Subject(s) - intersystem crossing , chemistry , substitution (logic) , pyrimidine , nucleic acid , photochemistry , triplet state , isospectral , stereochemistry , physics , organic chemistry , molecule , excited state , biochemistry , singlet state , quantum mechanics , computer science , programming language , mathematical physics
— 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.