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Title: ROTATIONAL ISOMERISM OF $Br_{2}DC-CDBr_{2}$$^{*}$
Creators: Piotrowski, E. A.; Sundaram, S.; Miller, Sidney I.; Cleveland, Forrest F.
Issue Date: 1958
Publisher: Ohio State University
Abstract: “The Raman spectrum of $C_{2}D_{2}Br_{4}$ was obtained with a Hilger 2-prism spectrograph. The Raman displacements $\Delta\sigma$, in $K$ ($K$ = kayser=wave/cm), the relative intensities l, and the depolorization factors $\rho$ are: $\Delta\sigma({I})\rho =$ 63(15)0.73, 112(13)0.55, 146(17)0.70, 175(19)0.68, 217(100)0.11, 434(7)0.77, 520(20)0.03, 603(6)0.35, 659(25)0.43, 793(2)0.82, 835(1)0.86, 873(3)0.72, 900(16)0.65, 944(0)0.66?, 073(1)0.86, 1065(12)0.21, and 2228(12)0.34. Also, infrared data were obtained in the region 400-4000 K. Of the 57 observed bands, the wave numbers $\sigma$ in $K$ of the intense ones are: $\sigma({I}) = 436$ (s), 521 (s), 569(m), 592(vs), 618(m), 655(vs), 838(vs), 901(vs), 976(vs), 1069(s), and 2232(vs). Raman and infrared spectral data also were obtained for $C_{2}H_{2}Br_{2}$. These data are essentially in agreement with Kagarise’s $results.^{1}$ A normal coordinate treatment using the Wilson FG matrix technique has been carried out for the trans isomer of each molecule by transferring potential energy constants from the molecules $CH_{2}Br_{2}$ and $C_{2}H_{2}Cl_{4}$. The tentative assignments for $C_{2}H_{2}Br_{4}$ are: $b_{g}-184, 724, 1133$; ${a}_{u}-637, 1139$; ${b}_{u}=-282, 586, 1117, 2985$; and for $C_{2}D_{2}Br_{4}$ they are: ${b}_{g}-184, 944$; ${a}_{u}-592, 873$; and ${b}_{u}-569, 838, 2232$. A complete assignment of all the observed bands for the two forms of both molecules will be reported elsewhere after the completion of the normal coordinate treatment which is now in progress for the gauche isomer.”
Description: $^{*}$Supported partly by a grant from the National Science Foundation. $^{1}$R. E. Kagarise, J. Cham. Phys. 24, 300 (1956).
Author Institution: Illinois Institute of Technology
Other Identifiers: 1958-I-05
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