Fourier transform infrared (FTIR) studies at 295 K of faujasite zeolite supercage-included tert-butyl halides (Cl, Br, I) are presented in comparison with the adsorbate molecular gas-phase and unloaded host solid-state spectra. The FTIR results reveal a propensity toward the exchange of quanta of vibrational excitation between guest and host modes, and between guest modes. The exchange phenomenon and some pseudo-hydrogen bonding effects are related to the siting of the guest molecules in the host supercage, and to the guest-host interactions at the guest site.