15N magnetic shielding anisotropies in 15N15NO

Abstract

The ¹⁵N magnetic shielding anisotropies in nitrous oxide (¹⁵N¹⁵NO) have been determined using a pulsed FT NMR spectrometer. The shielding anisotropies obtained from the temperature dependence of the nematic phase chemical shifts are 512 ± 10 ppm (central ¹⁵N) and 369 ± 15 ppm (end ¹⁵N). The values obtained from the nematic‐isotropic phase difference method are 505 ± 10 ppm (central ¹⁵N) and 366 ± 10 ppm (end ¹⁵N). Theoretical estimates of the anisotropies from the so‐called atom dipole method are also reported. The indirect scalar coupling constant has been assigned to be negative. The signs of the ¹⁵N spin‐rotation constants are predicted to be positive.