Patel D J, Shulman R G
Proc Natl Acad Sci U S A. 1970 Jan;65(1):31-8. doi: 10.1073/pnas.65.1.31.
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.
本文介绍了一项关于乙酰丙酮镍（II）和乙酰丙酮钴（II）与视黄基-N-甲基席夫碱结合的220兆赫质子核磁共振研究。该研究得出了9-顺式、13-顺式和全反式异构体π体系中碳原子的自旋密度大小和符号。通过将实验结果与分子轨道计算进行比较，提供了一种自旋从金属转移到视黄基席夫碱并随后沿多烯链离域的机制。
