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INTERNAL ROTATION: IX. THE INFRARED AND RAMAN SPECTRA OF LIQUID NORMAL ALKYL BROMIDES
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1957
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Optical MaterialsEngineeringInternal RotationOrganic ChemistryChemistrySpectroscopic PropertySpectra-structure CorrelationOptical PropertiesRaman Intensity RatioOptical SpectroscopyCarbon ChainMolecular SpectroscopyMaterials SciencePhysicsInfrared SpectroscopyPhysical ChemistryRaman IntensityNatural SciencesSpectroscopySpectroscopic Method
The ratio of the Raman intensity of the trans to gauche bands and also the optical density ratio, for n-alkyl bromides, has been examined in liquid, dilute solution, and vapor (for n-propyl bromide) and the temperature dependence of the Raman intensity ratio obtained over the range −80° to +80 °C. for the liquids. Both Raman and infrared ratios become constant for the higher members of the series but are measurably different for n-butyl and n-propyl bromide. The results are consistent with a very small difference in energy between gauche and trans forms in liquid, solution, or vapor, and can be interpreted semiquantitatively by assuming appropriate trans–gauche energy differences in the carbon chain.