Study of formation equilibria between [70]fullerene and a series of anisole by NMR spectrometric method

To improve the understanding of solution properties of [70]fullerene in aromatic solvents, binary systems of [70] fullerene with a series of anisole, viz., anisole, m-bromoanisole and p-bromoanisole have been studied in CCl4 medium by NMR spectroscopy. The complexes of [70]fullerene with the anisoles are shown to exhibit 1:1 ([70]fullerene:anisole) stoichiometry. Formation constants (K) of the above molecular complexes are determined using NMR spectroscopic technique. The K values of [70]fullerene/anisole, [70]fullerene/m-bromoanisole and [70]fullerene/p-bromoanisole give a good correlation of linear free energy relationship (L.P. Hammett, Chem. Rev. 53 (1953) 191).