Possibility of Coupling to haloform molecules in intercalated ${\mathrm{C}}_{60}$

For field-effect-doped fullerenes it was reported that the superconducting transition temperature $T_c$ is markedly larger for ${\mathrm{C}}_{60}2\mathrm{CH}{X}_3$ $(X=\mathrm{Cl},\mathrm{Br})$ crystals, than for pure ${\mathrm{C}}_{60}.$ As a possible mechanism it was proposed that there is not only coupling to the vibrational modes of the $C_{60}$ molecule, but also to the modes of the intercalated molecules. We investigate the possiblity of such a coupling. We find that, assuming the ideal bulk structure of the intercalated crystal, both a coupling due to hybridization of the molecular levels, and a coupling via dipole moments should be very small.