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The mechanisms of oxidation of NADH analogues 3. Stimulated nuclear polarization (SNP) and chemically induced dynamic nuclear polarization (CIDNP) in low magnetic fields in photo-oxidation reactions of 1,4-dihydropyridines with quinones

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https://www.sciencedirect.com/science/article/pii/101060309380153Z
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Citation

Polyakov, N., Taraban, M., Kruppa, A., Avdievich, N., Mokrushin, V., Schastnev, P., et al. (1993). The mechanisms of oxidation of NADH analogues 3. Stimulated nuclear polarization (SNP) and chemically induced dynamic nuclear polarization (CIDNP) in low magnetic fields in photo-oxidation reactions of 1,4-dihydropyridines with quinones. Journal of Photochemistry and Photobiology A: Chemistry, 74(1), 75-79. doi:10.1016/1010-6030(93)80153-Z.


Cite as: https://hdl.handle.net/21.11116/0000-0006-044E-F
Abstract
Radical particles formed during the photo-oxidation of 1,4-dihydropyridines (1,4-DHPs) by quinones in benzene and acetone have been characterized using stimulated nuclear polarization (SNP) and low-magnetic-field chemically induced dynamic nuclear polarization (CIDNP) techniques. The experimentally obtained hyperfine coupling constants of the 1,4-DHP radical ion and neutral radical qualitatively agree with those calculated using the INDO method. It has been found that the disproportionation reaction of two neutral nitrogen-centred 1,4-DHP radicals provides the main contribution to CIDNP in low magnetic fields.