VIBRATIONAL BOND MOMENTS FROM OUT-OF-PLANE BENDING MODES IN $CHCl=CHCl$ AND $F_{2}C=CH_{2}^{*}$
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Date
1955
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Ohio State University
Abstract
A notable discrepancy between bond moments obtained from different types of vibration occurs in ethylene, where the in-plane moments lie around 0.25 D, and the out-of-plane moment at 0.7 D. The relation of the out-of-plane bending moment to the molecular dipole moment has been investigated in transdichloroethylene and 1,1-difluoroethylene. Infrared intensitles reported here or taken from previously published spectra indicate the following out-of-plane bond moments:\mu_{CH}\sim\pm0.7, \mu_{CCl}\sim\pm0.7, \mu_{CF}\sim\pm1.0{D}. The molecular dipole moments, $\mu_{mol}$, for $cis-CHCl=CHCl$ and $F_{2}C-CH_{2}$ are calculated from these moments to be 0.1 and 0.5 D, respectively; the observed values of $\mu_{mol}$ being 1.9 and 1.4 D, respectively. The magnitudes and relative signs of these ``bond moments” are discussed in relation to possible electronic movements in the molecule during vibration.
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Author Institution: Metcalf Chemical Laboratories, Brown University