# VIBRATIONAL SPECTRA AND CRYSTAL STRUCTURE OF 1,1-DICHLOROETHYLENE.

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 Title: VIBRATIONAL SPECTRA AND CRYSTAL STRUCTURE OF 1,1-DICHLOROETHYLENE. Creators: D'Alessio, E.; Silberman, E.; Jones, E. A. Issue Date: 1969 Publisher: Ohio State University Abstract: The polarized infrared spectrum of crystalline 1-1 dichloroethylene was examined with 0.3 to $0.6 cm^{-1}$ resolution in the $4000-200 cm^{-1}$ range at temperatures between - 122 and $-250^{\circ}C$. Spectra of molecules isolated in an Argon matrix were also obtained as an aid in the assignment of the band splittings. Raman shifts of crystals at $-190^{\circ}C$ were measured with a laser Raman spectrometer. The density of the crystalline phase was determined near the freezing point temperature. Analysis of the activity, polarization and splittings of the bands, complemented by packing considerations, lead to the conclusion that 1-1 dichloroethylene crystallizes in the orthorhombic system and that it can only have a $C^{5}_{2v}, C^{9}_{2v}, D^{4}_{2}$ or $D^{15}_{2h}$ structure, the first being the most probable on the basis of qualitative density and dipole interaction energy considerations. Description: $^{\ast}$ Present address of E. D'Alessio: Comision Nacional de Energia Atomica. Avenida del Liberator 8250, Buenos Aires, Argentina. Silberman E. and Jones, E.A. Infrared Spectroscopy Laboratory, Fisk University, Nashville, Tennessee, 37203. Author Institution: Department of Physics and Astronomy, Vanderbilt University URI: http://hdl.handle.net/1811/15709 Other Identifiers: 1969-G-10