In Lewis-basic solvents, alkynyl carbons bonded to iodine have chemical shifts approximately 12-15 ppm higher in frequency than the corresponding shifts in CDCl3. We offer computational evidence that this solvent effect comes directly from polarization of the iodoalkyne triple bond. Hartree-Fock and Density Functional Theory calculations reproduce the change in chemical shift for a gas-phase complex between the iodoalkyne and dimethyl sulfoxide as Lewis base. The amount of spin-orbit coupling from the adjacent iodine does not change appreciably in the complex, according to the calculations.
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Rege et al. (2001) studied this question.
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