Micellar effects on photoprocesses in retinyl polyenes

Bhattacharyya, K. ; Rajadurai, S. ; Das, P. K. (1987) Micellar effects on photoprocesses in retinyl polyenes Tetrahedron, 43 (7). pp. 1701-1711. ISSN 0040-4020

Full text not available from this repository.

Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0040-4020(01)90282-0


The effects of micellar solubilization on excited-state properties of several retinyl polyenes have been examined primarily by nanosecond laser flash photolysis. The relative intensity of band system III (254-256 nm) in the ground state absorption spectrum of 11-cis retinal decreases significantly on going from methanol to micellar solutions, suggesting that the 12-s-trans form of 11-cis retinal is relatively favored in the organized media. In addition to microsecond transient phenomena due to triplets, the laser flash photolysis of all-trans and 11-cis retinal and all-trans retinyl Schiff base incorporated into micelles leads to 'permanent' absorption changes attributable to photoisomerization (in the case of retinals) and protonation and/or complexation with water (in the case of Schiff base). All-trans retinol and retinyl acetate in micellar solutions undergo ionic photodissociation leading to long-lived retinyl carbocation (λmax = 585-600 nm), the process being monophotonic in the case of retinyl acetate and predominantly bipho-tonic in the case of retinol. The trends in the location of ground-state absorption maxima (IBu+∗IAg) and triplet yield of retinals, and photodissociation yield of retinyl acetate suggest that the polarity of the environment probed by the polyene systems increases in the order: Triton X-100 < CTAB < NaLS.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:77190
Deposited On:10 Jan 2012 07:42
Last Modified:10 Jan 2012 07:42

Repository Staff Only: item control page