Microwave spectrum, quadrupole coupling constants, and structure of Nndash;bromodifluoromethanimine

摘要

A continuous flow system has been used to measure the microwave spectrum (26.5 to 40.0 GHz) of rapidly decomposing Nndash;bromodifluoromethanimine, CF2=NBr. The hyperfine structure of the spectrum caused by two nuclei with nuclear quadrupole moments (14N,79Br, or81Br) has been analyzed and rotational, centrifugal distortion, and quadrupole coupling constants have been determined by a global leasthyphen;squares fit for both bromine isotopic species. Identification and assignment ofRtransitions in thebhyphen;type spectrum have been facilitated considerably by the determination of the magnitude of the rotational constants from the hyperfine structure of theQtransitions alone. A structure compatible with the observed rotational constants has been determined for this planar molecule.