Photochemical properties of 1-(9-Anthryl)-2-(2-Quinolyl)ethylene

Spectral and photochemical properties of 1-(9-anthryl)-2-(2-quinolyl)ethylene ( 9A2QE ) in neutral and protonated forms have been studied experimentally and by quantum-chemical methods. It has been found that the quantum yield of trans-cis photoisomerization (φ tc ) has values of φ tc < 0.5 typic...

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Bibliographic Details
Published in:High energy chemistry 2014-05, Vol.48 (3), p.185-190
Main Authors: Budyka, M. F., Potashova, N. I., Gavrishova, T. N., Li, V. M.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Photochemistry
Physical Chemistry
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Summary:Spectral and photochemical properties of 1-(9-anthryl)-2-(2-quinolyl)ethylene ( 9A2QE ) in neutral and protonated forms have been studied experimentally and by quantum-chemical methods. It has been found that the quantum yield of trans-cis photoisomerization (φ tc ) has values of φ tc < 0.5 typical of the diabatic photoisomerization for both forms of 9A2QE. A comparison of this data with the results of the study of other aza-diarylethylenes containing the 2-styrylquinoline ( 2SQ ) moiety has led to the general conclusion that the increase in the π-system in 2SQ upon fusion of the benzene rings results in the disappearance of the α-effect, which lies in the fact that the quantum yield increases upon going from the neutral to protonated form up to the values φ tc > 0.5, which exceeds the limiting value for the diabatic photoisomerization.
ISSN:0018-1439
1608-3148
DOI:10.1134/S0018143914030047