Spin Delocalization in Retinals
- 1 January 1970
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 65 (1) , 31-38
- https://doi.org/10.1073/pnas.65.1.31
Abstract
A 220-MHz proton nuclear magnetic resonance study of the binding of Ni(II) and Co(II) acetylacetonates to retinyl- N -methyl Schiff's bases is presented. The study has yielded the magnitude and sign of spin densities at the carbon atoms in the π system of the 9- cis , 13- cis , and all trans isomers. From a comparison of the experimental results with molecular orbital calculations, a mechanism for transfer of spin from the metal to the retinyl Schiff's base and its subsequent delocalization down the polyene chain is provided.Keywords
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