Molecular Constants of Chlorodifluoromethane from Microwave Spectrum Analysis

The microwave spectrum of CHClF2 has been studied in the region 14 to 38 kMc and an analysis made for six transitions of each isotopic species. The following molecular constants were obtained: Rotational constants (Mc/sec)CHCl35F2CHCl37F2A10 234.6410 233.80B4861.244717.14C3507.313431.88Asymmetry parameterκ−0.597482−0.622091Quadrupole coupling constants (Mc/sec)χaa−64.96−51.07χbb35.6127.92χcc29.3523.15The C–H distance was assumed to be 1.09 Å, and the following structural parameters were computed: d(C–Cl)=1.74 Å, d(C–F)=1.35 Å, 〈HCCl=107°, 〈ClCF=110°30′, and 〈FCF=107°.