THE MICROWAVE SPECTRUM OF THE BENZENE-HCl HYDROGEN BOND COMPLEX
Loading...
Date
1982
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The microwave spectrum of benzene-HCl was studied in the gas phase using a pulsed Fourier-transform microwave spectrometer employing a Fabry Perot Cavity and a pulser supersonic nozzle as the molecular source. The $1 \rightarrow 2, 2 \rightarrow 3, 3 \rightarrow 4$ and $4 \rightarrow 5$ R branches were observed for benzene $H^{35}Cl$ and $D^{35}Cl$. The $3\rightarrow 4$ and $4 \rightarrow 5$ R branches were observed for benzene $H^{37}Cl$ and benzene $D^{37}Cl$. The microwave spectrum was characteristic of a symmetric top with the time averaged displacement of the H and Cl atoms from the $C_{6}$ axis being zero. Deuterium substitution of HCl demonstrated that the acidic proton lies between Cl and the benzene ring. $\chi^{Cl}_{aa}$ was measured for all four isotopes and is interpreted in terms of vibrationally averaging $\chi^{Cl}_{o}$ in HCl over two degenerate bending modes involving the angle between the $C_{6}$ axis and the HCl bond. The microwave spectrum, structure and interpretation of spectroscopic constants will be discussed.