  Intercalation of polyatomic molecules into a superconductor can drastically
affect the properties of the compound. A mechanism leading to a large increase
in Tc for such systems is proposed. It explains the recent remarkable
observation of high Tc superconductivity in the hole-doped C60/CHX3 (X=Cl,Br)
compounds and the large shift in their Tc upon Cl->Br substitution. The
increase in Tc is due to contribution to the pairing arising from the
interaction of electrons with the vibrational manifold of the molecule. The
proposed mechanism opens up the possibility to observe a site-selective isotope
effect. We also suggest that intercalating CHI3 would further increase the
critical temperature to Tc=140K.
