INFRARED SPECTRA OF CARBONYL SULFIDE-ACETYLENE TRIMERS: OCS-(C$_2$H$_2$)$_2$ AND TWO ISOMERS OF (OCS)$_2$-C$_2$H$_2$
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Date
2009
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Publisher
Ohio State University
Abstract
Spectra of acetylene-carbonyl sulphide trimers in the region of the OCS \nub{1} fundamental ($\sim$2062 \wn) are observed using a tunable diode laser to probe a pulsed supersonic slit jet expansion. A previous microwave study of (OCS)$_2$- C$_2$H$_2$ by Peebles and Kuczkowski \textbf{111}, 10511 (1999).} gave a nonplanar triangular twisted structure, which could be thought of as a polar OCS dimer plus a C$_2$H$_2$ monomer lying above the dimer plane. In the present work, three infrared bands are analyzed. The first band clearly belongs to this previously known (OCS)$_2$-C$_2$H$_2$ complex. The second band can be assigned as an isomer of (OCS)$_2$-C$_2$H$_2$ having a similar structure, but with a nonpolar OCS dimer plus a C$_2$H$_2$ monomer above the dimer plane. The third band is assigned to OCS-(C$_2$H$_2$)$_2$. The rotational constants and dipole moment components of all three bands are consistent with barrel shape structures having C$_1$, C$_2$ and C$_s$ symmetries, respectively.
Description
S.A. Peebles and R.L. Kuczkowski, \textit{J. Chem. Phys.
Author Institution: Department of Physics and Astronomy, University of Calgary; Calgary, AB T2N 1N4, Canada; Steacie Institute for Molecular Sciences, National Research; Council of Canada, Ottawa, ON K1A 0R6, Canada
Author Institution: Department of Physics and Astronomy, University of Calgary; Calgary, AB T2N 1N4, Canada; Steacie Institute for Molecular Sciences, National Research; Council of Canada, Ottawa, ON K1A 0R6, Canada