Abstract
The 13C shieldings and 13C 199Hg coupling constants of fourteen phenyl- and seven alkyl- and alkenyl-mercury compounds have been obtained. Substituent effects on the 13C shieldings are similar to those in nonmercurated phenyl compounds, with a similar relationship between 13C shieldings and Hammett σ + values of para substituents. For phenylmercuric salts of carboxylic acids, the shieldings are insensitive to the particular anion. Trends in 13C shieldings for a given compound type parallel 199Hg shielding trends. Directly-bonded 13C 199Hg coupling constants range from 1186 to 3196 Hz, two-bond coupling constants from 72 to 126 Hz and three-bond coupling constants from 101 to 221 Hz in the phenylmercury compounds. An alternation in the magnitude of J CHg, with the number of intervening bonds is apparent. The dihedral angle dependence of 3 J Chg in 2-norbornylmercury compounds is confirmed. No correlation was observed between the directly-bonded carbon-mercury coupling constant 1 J CHg and the shielding of the mercury-bonded carbon, but this coupling increases significantly with increases in the 199Hg shielding.
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