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The photochemical primary step and the potential in the proton bridge of the chromophore of visual pigments and bacteriorhodopsin
Author(s) -
Sandorfy C.
Publication year - 1984
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560260526
Subject(s) - bacteriorhodopsin , chromophore , protonation , photochemistry , isomerization , chemistry , proton , raman spectroscopy , schiff base , stereochemistry , optics , physics , organic chemistry , ion , biochemistry , quantum mechanics , membrane , catalysis
The primary photochemical step in the mechanism of vision is likely to involve cis → trans isomerization as well as proton transfer. Our understanding of this is connected with the problem as to whether the nitrogen of the chromophore Schiff base is protonated or not. More precisely we need to know the shape of the potential in the CN···H + ···X group, where X is a proton donor. It is proposed that this potential is double well. The consequences of this relating to the resonance Raman spectra are discussed.