Microwave Spectra and Molecular Structures of Fluoroform, Chloroform, and Methyl Chloroform

Abstract
Sufficient isotopic combinations have been studied to make complete structural determinations of fluoroform and chloroform from microwave rotational spectra. The dimensions of CHF3 are d CH = 1.098A, d CF = 1.332A, and ∠FCF = 108°48′; those of CHCl3 are d CH = 1.073A, d CCl = 1.767A, and ∠ClCCl = 110°24′. Measurements were made on only the most abundant isotopic species of CH3CCl3. If the CCl3 configuration as in chloroform and the CH3 configuration as in methane are assumed, the CC distance in CH3CCl3 is found to be 1.55A.