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The effect of molecular structure on the relaxation processes of carotenoids containing a carbonyl group

✍ Scribed by Mamoru Mimuro; Yoshinobu Nishimura; Shinichi Takaichi; Yumiko Yamano; Masayoshi Ito; Shin-ichi Nagaoka; Iwao Yamazaki; Tetzuya Katoh; Umpei Nagashima

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
458 KB
Volume
213
Category
Article
ISSN
0009-2614

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✦ Synopsis

Relaxation processes of the singlet excited states of carotenoids containing a carbonyl group were investigated in relation to the molecular structure around the carbonyl group. The relative quantum yield of fluorescence from the allowed Sz state to the forbidden S, state follows the energy gap law of internal conversion. Further, increase in the fluorescence yield from the S, state was strongly correlated with increase in the degree of conjugation of a carbonyl group to polyene chain. These were discussed in relation to ( 1) the coplanarity of x-electron system including a carbonyl group in the ground state and (2) the nature of transition and the molecular structure in the excited states.

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The solvent effect on the fluorescence quantum yields of St (~1) and $2 (Β’~2) states of carotenoids containing a keto group is examined. The relative yields (~b2/~1) are expressed exponentially as a function of the reciprocal of the dielectric constants of several non-polar solvents. This relationsh