15min:
MICROWAVE SPECTRA AND MOLECULAR STRUCTURES OF 2-CHLORO-1,1-DIFLUOROETHYLENE AND ITS COMPLEX WITH ARGON.

JOSEPH P. MESSINGER, GREGORY S. KNOWLTON, KATHRYN M. SUNDHEIM, HELEN O. LEUNG AND MARK D. MARSHALL, Department of Chemistry, Amherst College, P.O. Box 5000, Amherst, MA 01002-5000.

Chirped-pulse and Balle-Flygare spectrometers are used to obtain Fourier transform microwave spectra of 2-chloro-1,1-difluoroethylene and its complex with argon from 5.5 to 21.0 GHz, allowing for the geometries of both species to be determined. A total of six isotopologues are observed each for the monomer and dimer, including the most abundant species, the singly-substituted 37Cl and two singly-substituted 13C isotopologues in natural abundance, and deuterated versions of both the 35Cl and 37Cl species using an isotopically enriched sample. Similar to the previously studied argon-haloethylene complexes, the argon shows a preference for close contact with heavier atoms. Tunneling of the argon between two equivalent non-planar structures, similar to that in argon- cis -1,2-difluoroethylene, is not observed in this complex.