CYCLOPROPANE-SULFUR DIOXIDE: MICROWAVE SPECTRUM AND STRUCTURE
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Date
1991
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Volume Title
Publisher
Ohio State University
Abstract
The microwave spectrum of the cyclopropane-sulfur dioxide van der Waals complex has been observed by Fourier transform microwave spectroscopy. The spectrum exhibited $a-$ and $c$-dipole selection rules; the c-type transitions were split into doublets of unequal intensity separated by about 200 kHz. The stronger and weaker c-type transitions were each fit independently with the $a$-type transitions using the Watson S-reduced Hamiltonian to rotational constants A = 6176.635(7) MHz, B = 1258.497(1) MHz, C = 1180.101(1) MHz for the stronger transitions and A = 6176.828(8) MHz, B = 1258.497(1) MHz, C = 1180.101(1) MHz for the weaker transitions. The complex has $C_{s}$ symmetry. The $C_{2}$ axis of sulfur dioxide lies in the CCC plane nearly parallel to a C-C bond with the oxygens straddling the plane; the center of mass of the sulfur dioxide is 3.31 {\AA} from the C-C bond center. The splittings in the spectrum suggest an internal rotation of the cyclopropane subunit.""
Description
Author Institution: Department of Chemistry, University of Michigan