Deuterium-induced primary and secondary isotope effects on 13C,H coupling constants in halomethanes

Primary pΔJ(13C,H) and secondary sΔJ(13C,H) isotope effects on carbon-proton coupling constants were measured in studies of proton-and deuteron-coupled 13C NMR spectra of the halomethanes CHnDmX4-n-m, where X is Cl, Br or I. Both effects are always negative. The magnitudes of pΔJ(13C,H) increase with the number of halogen atoms whereas those of sΔJ(13C,H) decrease. pΔJ(13C,H) is almost linearly dependent on the number of halogen atoms whereas for sΔJ(13C,H) the dependence is non-linear. New results for the isotope effect on the 13C,H coupling constant in fluoroform are in accord with data for the other members of the haloform series. For CH3Br and CH3I estimates of the main features of the surfaces for the 13C,H coupling constants were made using known molecular force fields. © 1998 John Wiley & Sons, Ltd.

Авторы
Sergeyeva N.D. 1 , Sergeyev N.M.2, 5 , Raynes W.T.3, 4
Редакторы
-
Издательство
John Wiley and Sons Ltd
Номер выпуска
4
Язык
Английский
Страницы
255-260
Статус
Опубликовано
Подразделение
-
Номер
-
Том
36
Год
1998
Организации
  • 1 Department of Natural Sciences, Russ. Univ. of Peoples' Friendship, 117198, Moscow, Russian Federation
  • 2 Department of Chemistry, Moscow State University, 119899, Moscow, Russian Federation
  • 3 Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
  • 4 Department of Chemistry, University of Sheffield, Sheffield, 53 7HF, United Kingdom
  • 5 Dept. of Chemistry, Moscow State University, 119899 Moscow, Russian Federation
Ключевые слова
13C NMR: Halomethanes; Carbon-proton spin-spin coupling constants; Deuterium isotope effects
Дата создания
19.10.2018
Дата изменения
19.10.2018
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/687/