VIBRATIONAL SPECTRA OF PRIMARY AND SECONDARY ALIPHATIC AMINES
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Date
1958
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Ohio State University
Abstract
“A survey of the infrared spectra of primary and secondary aliphatic amines has provided some new spectra-structure correlations. Primary amines have strong broad absorption bands at 815 $\pm$ $35 cm^{-1}$, while secondary amines have similar bands at 730 $\pm$ $25 cm^{-1}$. These bands are associated with bending vibrations of the H-N-H and C-N-H bonds. In addition, secondary amines have strong bands at 1160 $\pm$ $30 cm^{-1}$ and primary amines have much weaker absorptions at 1085 $\pm$ $45 cm^{-1}$. A normal coordinate treatment of four-body models of the type $R_{2}NH_{2}$ and $R_{2}NH_{2}$, assuming $C_{a}$ symmetry, has been helpful in understanding the nature of amine vibrations.”
Description
Author Institution: Beckman Instruments, Inc.