Journal ArticleDOI
Relationship between Absorption Spectrum and Molecular Conformations of 11-cis-Retinal
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The results of experiments allow the identification of particular absorption bands in the 11-cis-retinal spectrum, which are steric hindrance and bend in the system of conjugated double bonds.Abstract:
THE absorption spectrum of 11-cis-retinal is strongly influenced by the presence of a cis bond between carbon atoms 11 and 12. The cis bond in this position results in two important spatial properties of the molecule: first, steric hindrance between the C13-methyl group and the C10-hydrogen atom; second, a bend in the system of conjugated double bonds. Both the steric hindrance and the bend in the molecule give rise to particular absorption bands. We now report the results of experiments which allow the identification of these absorption bands in the 11-cis-retinal spectrum.read more
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References
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Journal ArticleDOI
Contact Electron‐Spin Coupling of Nuclear Magnetic Moments
TL;DR: In this article, the valence-bond theory for the contact electron-spin coupling of nuclear magnetic moments is used to calculate the proton−proton, proton-fluorine, and fluorine-florine coupling constants in ethanic and ethylenic molecules.
Journal ArticleDOI
Pre-lumirhodopsin and the bleaching of visual pigments.
Tôru Yoshizawa,George Wald +1 more