Time-resolved CIDNP: an NMR way to determine the EPR parameters of elusive radicals

Time-resolved CIDNP: an NMR way to determine the EPR parameters of elusive radicals Научная публикация

Журнал

Physical Chemistry Chemical Physics
ISSN: 1463-9076

Вых. Данные

Год: 2011, Том: 13, Номер: 14, Страницы: 6619-6627 Страниц : 9 DOI: 10.1039/C0CP02449J

Ключевые слова

hyperfine coupling constants, laser flash photolysis, electron spin resonance, dynamic nuclear polarization, aqueous solution, amino acids, magnetic field, cation, methionine, tyrosine

Авторы

Morozova Olga B. ¹ , Ivanov Konstantin L. ¹ , Kiryutin Alexey S. ¹ , Sagdeev Renad Z. ¹ , Köchling Talea ² , Vieth Hans-Martin ² , Yurkovskaya Alexandra V. ¹

Организации

1	International Tomography Center, Institutskaya 3a, 630090 Novosibirsk, Russia.
2	Institut fuer Experimentalphysik, Freie Universitaet Berlin, Arnimallee 14, D-14195, Berlin, Germany.

Chemically Induced Dynamic Nuclear Polarization (CIDNP) of the diamagnetic products of radical reactions is exploited for the purpose of determination of the hyperfine coupling constants (HFCCs) of the radical intermediates. A simple proportionality relation between geminate CIDNP of a nucleus and its HFCC at the radical stage is established. The applicability range of this relation is determined: the relation is fulfilled in the case of a large difference in g-factor between the radicals involved and for the situation where the number of magnetic nuclei in the system is sufficiently large. The validity of the relation was confirmed by CIDNP experiments on radical pairs with precisely known HFCCs. Using the proportionality relation we were able to measure the HFCCs in various short-lived radicals of the amino acids histidine and tryptophan and of the S-N-centered cyclic radical of methionine derived from the methionine-glycine dipeptide in aqueous solution.

Morozova O.B. , Ivanov K.L. , Kiryutin A.S. , Sagdeev R.Z. , Köchling T. , Vieth H-M. , Yurkovskaya A.V.
Time-resolved CIDNP: an NMR way to determine the EPR parameters of elusive radicals
Physical Chemistry Chemical Physics. 2011. V.13. N14. P.6619-6627. DOI: 10.1039/C0CP02449J WOS OpenAlex

Поступила в редакцию:	8 нояб. 2010 г.
Принята к публикации:	2 февр. 2011 г.
Опубликована online:	7 мар. 2011 г.

Web of science:	WOS:000288678900025
OpenAlex:	W2069764065

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