Raman spectra and molecular configurations of solid ethylene dihalides
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The disappearance of many Raman lines of ethylene dihalides on solidification, which was the most important result of our previous experiment, acquired further confirmation by the more accurate measurement of the present experiment. It was shown by the calculation of normal vibrations as well as by the study of isotopic effect that practically all the molecules of solid ethylene dihalides assume thetrans-form. If, therefore, the thermal transitions observed for these solids (−65°C. for C2H4Cl2 and −24°C. for C2H4Br2) are caused by the onset of molecular rotation, this must take place about only one axis,i.e., that of the zigzag X−C−C−X chain. Such a rotation in one dimension does not contradict the existence of the crystal forces which keep the molecule of the solid in a nearly puretrans-state and is consistent with the small values of heat of transition estimated in thermal measurements.
KeywordsThermal Transition Raman Line Liquid Line Normal Vibration Molecular Rotation
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