Substituted Methanes. X. Infrared Spectral Data, Assignments, Potential Constants, and Calculated Thermodynamic Properties for CF3Br and CF3I

Infrared wave numbers, relative intensities, and percent transmission curves have been obtained for CF3Br and CF3I in the region 400–2200 cm−1. Assignments are given for the observed bands, in which the assignments of Plyler and Acquista for ν2 and ν3 are interchanged. Potential constants were calculated for both molecules by the Wilson FG matrix method. And, finally, the heat content, free energy, entropy, and heat capacity for the ideal gaseous state at 1 atmos pressure were calculated for 12 temperatures from 100°to 1000°K, using a rigid rotator, harmonic oscillator approximation.