Amines infrared absorption frequencies

The Infrared Region 515 12-4 Molecular Vibrations 516 12-5 IR-Active and IR-lnactive Vibrations 518 12-6 Measurement of the IR Spectrum 519 12-7 Infrared Spectroscopy of Hydrocarbons 522 12-8 Characteristic Absorptions of Alcohols and Amines 527 12-9 Characteristic Absorptions of Carbonyl Compounds 528 12-10 Characteristic Absorptions of C—N Bonds 533 12-11 Simplified Summary of IR Stretching Frequencies 535 12-12 Reading and Interpreting IR Spectra (Solved Problems) 537 12-13 Introduction to Mass Spectrometry 541 12-14 Determination of the Molecular Formula by Mass Spectrometry 545... 

In Table 5.4 are listed correlations for the CH group. The hydrocarbon CH stretch occurs near 2900 cm" and is usually lost among other aliphatic absorptions. The CH deformation absorbs weakly in hydrocarbons at 1350-1315 cm" in the infrared. This vibration is more distinctive in the Raman effect. In nonhydrocarbons, such as ortAo-formates, acetals, secondary peroxides, or a-subsdtuted amines, the CH deformation at 1350-1315 cm" is intensified in the infrared. In secondary alcohols, the CH and OH deformation interact to give two bands sensitive to hydrogen bonding at 1440-1350 and 1350-1200 cm" (see alcohols). A chlorine next to the CH will raise the stretching (ca. 3000 cm" ) and lower and intensify the bending frequency (1250-1200 cm" ). 

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