Abstract
The C-H, C-F, Hg-C, Hg-H and Hg-F spin-spin coupling constants of CF 3HgCH 3 in hexadeuterobenzene have been determined. The last two of these coupling constants have been also measured in nematic Merck ZLI 1167, ZLI 1132 and Phase IV liquid crystals heated to isotropic states. It appears that these coupling constants are solvent and temperature dependent; J(Hg-F), m particular, varies from 942.7 Hz to 955.1 Hz in nematic solvents and has a value of 926.4 Hz in a benzene solution. The distance ratios obtained in the aforesaid nematic solvents by using direct dipole-dipole coupling constants corrected for harmonie vibrations agree within the error limits. However, serious trouble arises in determining the positions of the fluorine nuclei. These difficulties arise partly from the low relative precisions of the dipole-dipole coupling constants and partly from the indirect contributions in the experimental values.
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