Knowledge Bank

Microwave spectrum of bromodifluoromathane, $CHBrF2$ (Freon FC-22Bl), for the $\mathrm{<mrow\; data-mjx-texclass="ORD">79</mrow>}$Br and $\mathrm{<mrow\; data-mjx-texclass="ORD">81</mrow>}$Br species has been studied by a Stark modulation spectrometer. The Spectrum consists of strong $c$-type and weak $a$-type transitions. A simultaneous least-squares analysis of the observed transition frequencies gave the rotational, quartic centrifugal distortion, and bromine nuclear quadrupole coupling constants. The distance for the $\mathrm{<mrow\; data-mjx-texclass="ORD">79</mrow>}$Br and $\mathrm{<mrow\; data-mjx-texclass="ORD">81</mrow>}$Br species are 2.171843 \AA and 2.171849 \AA, respectively. These distance are slightly longer than the corresponding value 2.17053 \AA in $CHCIF2$. The electronic characters of the C-Br bond have been determined from the bromine nuclear quadrupole coupling constants and are compared with those of other related molecules.