Magnetic double resonance studies of carbon-13 and nitrogen-15 chemical shift anisotropies in methyl cyanide partially oriented in a nematic liquid crystal

Publisher Website
Google Scholar
Abstract
1H- {13C} and 1H- {15N} heteronuclear double resonance experiments are used to determine the transition frequencies in the 13C and 15N N.M.R. spectra of isotopically entriched samples of methyl cyanide dissolved in the nematic mesophase of p-ethoxybenzylidene-p-butyl aniline. It is found that σ∥ - σ⊥ in the -C ≡ N group has values of 307 and 452 p.p.m. for 13C and 15N respectively, and these are rationalized in terms of Pople's LCAO theory of nuclear shielding.