Author/Authors :
Park، نويسنده , , Gregory H.J. and Martin، نويسنده , , Rachel W. and Sakellariou، نويسنده , , Dimitris and Pines، نويسنده , , Alexander and Shahkhatuni، نويسنده , , Aleksan G. and Shahkhatuni، نويسنده , , Astghik A. and Panosyan، نويسنده , , Henry A.، نويسنده ,
Abstract :
NMR spectra of 13C–iodomethane oriented in three different liquid crystalline solvents have been collected and analyzed under spinning at various angles with respect to the static magnetic field. For each sample the ratio of homonuclear (1H–1H) to heteronuclear (13C–1H) dipolar couplings, which is a function of the geometry of the solute molecule, does not change significantly with the scaling of the dipolar couplings due to spinning at different angles. This result implies that the ‘apparent bond angle deviations’ (Δθa), previously calculated from thermotropic liquid crystals, arise from a solvent effect and are not an artifact from scaling the anisotropic interactions.
