Laser photolysis studies of photochromic processes in spirooxazines: solvent effects on photomerocyanine behavior

The photochemistry of spirooxazines I and II was examined using laser flash photolysis techniques. Both compounds lead to the formation of a strongly absorbing and long-lived, ring-opened photomerocyanine (PMC). In non-polar solvents the PMCs undergo photo-isomerization induced by visible light irra...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1992-05, Vol.66 (1), p.79-90
Main Authors: Bohne, C., Fan, M.G., Li, Z.J., Liang, Y.C., Lusztyk, J., Scaiano, J.C.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
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Summary:The photochemistry of spirooxazines I and II was examined using laser flash photolysis techniques. Both compounds lead to the formation of a strongly absorbing and long-lived, ring-opened photomerocyanine (PMC). In non-polar solvents the PMCs undergo photo-isomerization induced by visible light irradiation which ultimately regenerates the starting materials. In the case of II an additional transient (believed to be a charge-transfer intermediate) is also formed. In spite of the rich transient phenomena observed, no new products were detected even after extensive laser irradiation. The remarkable fatigue resistance of these compounds makes them excellent candidates for commercial applications.
ISSN:1010-6030
1873-2666
DOI:10.1016/1010-6030(92)85121-A