The 3He NMR spectra of a [60]fullerene cation and some arylated [60]fullerenes

Abstract

The ³He NMR spectra have been measured for the following compounds containing ³He within the fullerene cage: symmetrical C₆₀Ph₂, unsymmetrical C₆₀Ph₄, C₆₀Cl₆, C₆₀Ph₅Cl, C₆₀(4-FC₆H₄)₅Cl, and the carbocation derived from the latter by the addition of AlCl₃. In general there is an increase in ³He shielding with increased number of addends, and a decrease in shielding, relative to the precursor, on forming the cation.