The Cage Structure of IndanCHF(3) is Based on the Cooperative Effects of C-H center dot center dot center dot pi and C-H center dot center dot center dot F Weak Hydrogen Bonds

The structural and energetic features of the CH interaction and the internal dynamics of the CHF3 group change drastically in going from benzeneCHF(3) to indanCHF(3), according to the analysis of the rotational spectrum of the latter complex generated in a supersonic expansion.