R. Villamañán, J. Alonso
Jun 30, 1989
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Influential Citations
13
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Journal
Chemical Physics Letters
Abstract
Abstract Microwave spectra of 3-fluorostyrene are analyzed in the frequency region 26.5–40.0 GHz. The analysis confirms the existence in the gas phase of two rotational isomers, cis and trans. Relative intensity measurements and estimated electric dipole moment components give an energy difference of 26±46 cm−1 with the cis rotamer being the more stable. Several torsional excited states are assigned for each form. The inertia defect and the variation of the rotational constants with torsional quantum number demonstrate that the equilibrium conformation is planar for both rotamers. Plausible structures for each rotamer are proposed from the rotational constants. For the cis rotamer, a single-minimum potential function of the quadratic-quartic type is estimated for the bottom of the torsion potential energy curve of the vinyl group.