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

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...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 1993-08, Vol.74 (1), p.75-79
Main Authors: Polyakov, N.E., Taraban, M.B., Kruppa, A.I., Avdievich, N.I., Mokrushin, V.V., Schastnev, P.V., Leshina, T.V., Lüsis, V., Muceniece, D., Duburs, G.
Format: Article
Language:English
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Summary: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.
ISSN:1010-6030
1873-2666
DOI:10.1016/1010-6030(93)80153-Z