Literature DB >> 5263759

Spin delocalization in retinals.

D J Patel, R G Shulman.   

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 pi 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.

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Year:  1970        PMID: 5263759      PMCID: PMC286186          DOI: 10.1073/pnas.65.1.31

Source DB:  PubMed          Journal:  Proc Natl Acad Sci U S A        ISSN: 0027-8424            Impact factor:   11.205


  5 in total

1.  Photochemical and stereochemical properties of carotenoids at low temperatures.

Authors:  L JURKOWITZ; J N LOEB; P K BROWN; G WALD
Journal:  Nature       Date:  1959-08-22       Impact factor: 49.962

2.  Visual pigments: their spectra and isomerizations.

Authors:  J R Wiesenfeld; E W Abrahamson
Journal:  Photochem Photobiol       Date:  1968-11       Impact factor: 3.421

3.  Lipid to protein chromophore transfer in the photolysis of visual pigments.

Authors:  R P Poincelot; P G Millar; R L Kimbel; E W Abrahamson
Journal:  Nature       Date:  1969-01-18       Impact factor: 49.962

4.  220 MHz proton nuclear magnetic resonance spectra of retinals.

Authors:  D J Patel
Journal:  Nature       Date:  1969-03-01       Impact factor: 49.962

5.  Vitamin A analogues. 3. Determination of the stereochemical configuration of some polyenes of the 4-thia-vitamin A series by NMR spectrometry.

Authors:  P K Korver; C Kruk; P J van der Haak; J L Baas; H O Huisman
Journal:  Tetrahedron       Date:  1966-01       Impact factor: 2.457

  5 in total

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