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>Correlations between Characteristic Frequencies of the Paraffins and the Skeletal Frequencies of Some Structurally Analogous Polar Molecules
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Correlations between Characteristic Frequencies of the Paraffins and the Skeletal Frequencies of Some Structurally Analogous Polar Molecules
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机译：Correlations between Characteristic Frequencies of the Paraffins and the Skeletal Frequencies of Some Structurally Analogous Polar Molecules
Some close analogies are found in the region 1500 to 600 cmmdash;1between the frequencies of a number of paraffins and their more polar analogs in which CH3groups are replaced by F, OH, or NH2groups. The great intensities of the infrared bands of the polar molecules have led to their assignment to skeletal stretching modes; a similar assignment for the frequencies of the paraffins may therefore be deduced. On this criterion the 1053 cmmdash;1band of propane, the 1170 cmmdash;1band of isobutane, and the 1249 cmmdash;1band of neopentane are to be attributed principally to skeletal stretching vibrations. Some apparently contradictory conclusions reached earlier from studies of deuterium substituted propanes and neopentanes are discussed.
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