Abstract
The deuteron quadrupole coupling constants, Q D, and methyl angles of the solute molecules CD 3CN, CD 3Br, CD 3I, and CD 3NO 2 were determined in various liquid-crystal solvents by use of NMR spectroscopy of oriented molecules. Carbon-13 satellites at natural abundance in the 2H or 1H spectra were used for the measurement of the degree of order of the CD bonds. The results reveal a strong solvent dependence of Q D (maximum variation of 26% in CD 3NO 2) as well as of the DCD angle (maximum variation of 2.3 degrees in CD 3I). These large apparent effects are attributed to much smaller real variations occurring in a two-site interaction. A general correlation between increasing anisotropy of the solvent diamagnetic susceptibility, decreasing Q D, and increasing DCD angle is observed.
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