THE MICROWAVE SPECTRA OF ETHYLENE-WATER COMPLEX AND ITS ISOTOPOMERS FROM FTMW SPECTROSCOPY

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 Title: THE MICROWAVE SPECTRA OF ETHYLENE-WATER COMPLEX AND ITS ISOTOPOMERS FROM FTMW SPECTROSCOPY Creators: Andrews, Anne M.; Kuczkowski, R. L. Issue Date: 1992 Publisher: Ohio State University Abstract: The ethylene-water complex was first observed by Peterson and Klemperer using the MBER $technique.^{1}$ They showed that the water was hydrogen bonded to the $\pi$-system of ethylene and, from the observation of split transitions in the spectrum, determined that the complex was undergoing an internal motion which was attributed to a rotation of the water subunit about the hydrogen bond. They determined the $\mu_a$ component of the dipole moment as 1.0943(6) D. We have re-investigated the spectrum of this complex in the region 7-18 GHz using the FTMW technique. The spectra of the isotopomers $C_{2}$$H_{4} \cdot HDO, C_{2}$$H_{4}$ $\cdot$ $D_{2}O$, cis-CHD-CHD $\cdot$ $H_{2}O$, trans-CHD-CHD $\cdot$ $H_{2}O$, $CH_{2}-CD_{2}$ $\cdot$ $H_{2}O$, $C_{2}H_{4}$ $\cdot$ $H_{2}^{18}O$ and $C_{2}H_{4}^{17}H_{2}O$ were also studied. Several new transitions were observed in the spectrum of the normal isotopic species. Splitting patterns and relative intensities of the tunneling doublets of the isotopomers are consistent with an tunneling pathway which exchanges the two water hydrogen atoms. The dipole moment components and $^{17}O$ nuclear quadrupole coupling constants were measured with anomalous results. Description: 1.K.I.Peterson and W. Klemperer, J. Chem. Phys., 85, 725, (1986). Author Institution: Chemistry Department, University of Michigan URI: http://hdl.handle.net/1811/12744 Other Identifiers: 1992-RB-05