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NORMAN C. CRAIG AND MICHAEL C. MOORE, Department of Chemistry and Biochemistry, Oberlin College, Oberlin, OH 44074; TONY MASIELLO, Environmental and Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, Mail Stop K8-88, Richland, WA 99352.
We seek an equilibrium structure cis,cis -1,4-difluorobutadiene. Rotational structure of a C-type band centered at 762.8 cm-1 in the high-resolution infrared spectrum (0.0015 cm-1) has been analyzed as a first step. A sequence of strong hot bands of the torsional mode (78 cm-1) complicate the analysis of this band. Provisional ground state rotational constants are reported. The spectrum of a second C-type band at 328 cm-1 may also be analyzable. Ground state rotational constants for a full set of isotopomers are needed. A procedure for synthesizing these species is being explored.