TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS

T. Rosenfeld; A. Alchalel; M. Ottolenghi

doi:10.1111/j.1751-1097.1974.tb06558.x

TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS

T. Rosenfeld^*
, A. Alchalel
, M. Ottolenghi

^*Corresponding author for this work

School of Pharmacy

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

Abstract—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.

Original language	English
Pages (from-to)	121-125
Number of pages	5
Journal	Photochemistry and Photobiology
Volume	20
Issue number	2
DOIs	https://doi.org/10.1111/j.1751-1097.1974.tb06558.x
State	Published - Aug 1974

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@article{bbaa440ef7394373bfc6898465d3a0b1,

title = "TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS",

abstract = "Abstract—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 (φDISO) and triplet‐sensitized (φTISO) photoisomerization yields, determined using steady irradiation methods, are found to be: φTISO (9‐cis) = 0.06, φTISO (11‐cis) = 045, φTISO (13‐cis) = 008, φTISO (all‐trans) = 0.02‐0.05, φDISO (11‐cis, = (4 ± 1) × 10‐3, φDISO (all‐trans) = (2 ± 1) × 10‐3. The possible role of the triplet state in the isomerization of rhodospin is discussed.",

author = "T. Rosenfeld and A. Alchalel and M. Ottolenghi",

year = "1974",

month = aug,

doi = "10.1111/j.1751-1097.1974.tb06558.x",

language = "אנגלית",

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T1 - TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS

AU - Rosenfeld, T.

AU - Alchalel, A.

AU - Ottolenghi, M.

PY - 1974/8

Y1 - 1974/8

N2 - Abstract—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 (φDISO) and triplet‐sensitized (φTISO) photoisomerization yields, determined using steady irradiation methods, are found to be: φTISO (9‐cis) = 0.06, φTISO (11‐cis) = 045, φTISO (13‐cis) = 008, φTISO (all‐trans) = 0.02‐0.05, φDISO (11‐cis, = (4 ± 1) × 10‐3, φDISO (all‐trans) = (2 ± 1) × 10‐3. The possible role of the triplet state in the isomerization of rhodospin is discussed.

AB - Abstract—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 (φDISO) and triplet‐sensitized (φTISO) photoisomerization yields, determined using steady irradiation methods, are found to be: φTISO (9‐cis) = 0.06, φTISO (11‐cis) = 045, φTISO (13‐cis) = 008, φTISO (all‐trans) = 0.02‐0.05, φDISO (11‐cis, = (4 ± 1) × 10‐3, φDISO (all‐trans) = (2 ± 1) × 10‐3. The possible role of the triplet state in the isomerization of rhodospin is discussed.

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ER -

TRIPLET STATES AND cis‐trans PHOTOISOMERIZATION PROCESSES IN THE SCHIFF BASES OF RETINAL ISOMERS

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