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TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS
Author(s) -
Rosenfeld T.,
Alchalel A.,
Ottolenghi M.
Publication year - 1974
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.1751-1097.1974.tb06558.x
Subject(s) - photoisomerization , isomerization , chemistry , photochemistry , schiff base , cis–trans isomerism , triplet state , irradiation , flash photolysis , kinetics , reaction rate constant , stereochemistry , molecule , organic chemistry , catalysis , physics , quantum mechanics , nuclear physics
—The triplet states of the n ‐butyl‐amine Schiff bases of 11‐ cis , 9‐ cis , 13‐ cis and all‐ trans retinal are produced via triplet‐triplet energy transfer. Their absorption spectra, peaking around 435 nm, and their decay kinetics are recorded using pulsed‐laser photolysis. Direct‐excitation (φ D ISO ) and triplet‐sensitized (φ T ISO ) photoisomerization yields, determined using steady irradiation methods, are found to be: φ T ISO (9‐ cis ) = 0.06, φ T ISO (11‐ cis ) = 045, φ T ISO (13‐ cis ) = 008, φ T ISO (all‐ trans ) = 0.02‐0.05, φ D ISO (11‐ cis , = (4 ± 1) × 10 ‐3 , φ D ISO (all‐ trans ) = (2 ± 1) × 10 ‐3 . The possible role of the triplet state in the isomerization of rhodospin is discussed.