Vibrational Spectrum of Tetrabromoethylene

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Abstract
The infrared spectrum of C2Br4 in various solvents and as a liquid has been observed and measured in the range 3—100μ. The new data, in conjunction with earlier results and force constant calculations, have enabled for the first time an essentially complete and satisfactory vibrational assignment. The fundamentals, in units of cm—1, are 1535, 265, 144 in a1g; 880, 208 in b1g; 766, 119 in b2u; 635, 188 in b3u; 66 in a1u; 245 in b1u; and 464 in b2g. The present results for C2Br4 have required that two changes be made in the earlier assignment for C2Cl4. The angular modes of the chloro compound in b1u and b3u are now found to be at 288 and 310 cm—1, respectively. The assignments for C2F4, C2Cl4, and C2Br4 are then complete and concordant.

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