|
ИСТИНА |
Войти в систему Регистрация |
Интеллектуальная Система Тематического Исследования НАукометрических данных |
||
Isotope effect due to N-15/N-14 substitution on N-14-N-14 coupling constants in nitrous oxideстатья
Информация о цитировании статьи получена из
Scopus,
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Strelenko Y.A., Sergeyev N.M.
- Журнал: Journal of Molecular Structure
- Том: 378
- Номер: 1
- Год издания: 1996
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 61
- Последняя страница: 65
- DOI: 10.1016/0022-2860(95)09148-3
- Аннотация: N-14 and O-17 NMR spectra of a solution of nitrous oxide, NNO in acetonitrile were measured on a Bruker AM 300 spectrometer. The N-14 NMR spectrum reveals two narrow lines at about -147 and -231 ppm relative to external nitromethane assigned to the central and terminal nitrogen atoms, respectively. Both lines exhibit mutual spin-spin splittings equal to 4.233 (+/-0.006) Hz. The O-17 NMR spectrum also reveals a rather narrow line with a chemical shift of 110 ppm relative to external water with a clearly seen 1:1:1 triplet structure due to a (1)J(N-14-O-17) coupling constants of 35.8 (+/-0.3) Hz. Accurate experimental values were obtained using the QUADR program. Comparison of the (1)J(N-14-N-14) coupling constant measured in the present study with (1)J(N-15-N-15) coupling constant equal to -9.16 (+/-0.3) Hz (or -4.65 (+/-0.2) Hz on the basis of N-14-N-14 coupling constants) obtained previously by Bhattacharrya and Dailey reveals a strong, double primary isotope effect of about 10%. This can be considered as one of the largest isotope effects on coupling constants ever measured.
- Добавил в систему: Сергеев Николай Михайлович