l02_handout - Absorption Spectroscopy Type of Radiation...

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Absorption Spectroscopy Type of Radiation Energy (kcal/mol) Frequency Wavelength Molecular Interaction Microwave Infrared Visible Ultraviolet 0.001 - 1 1.1 - 11 50 - 75 75 - 150 1 - 400 cm -1 400 - 4,000 cm -1 400 - 600 nm 200 - 400 nm Translation Molecular Rotations Molecular Vibrations Electronic Excitation Rotation of the molecular as a whole about its center of mass Stretching and binding of bonds Promotion of electrons to higher energy levels Infrared Absorption Spectroscopy 4000 cm -1 2000 cm -1 1500 cm -1 400 cm -1 Region X - H Region SP Region X = Y Region Fingerprint 2000 - 1500 2500 - 4000 cm -1 2500 cm -1 2000 cm -1 400 - 1500 cm -1 C-H N-H O-H C=C C=C Single Rond Stretching Stretching C=N C=O Bond Bending Stretching C=N Polyatomic Vibrations Stretching Figure by MIT OCW.
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Infrared Spectra: Tables of Reference X-H Region Phenols and Alcohols Acids Amides and Amines C-H bonds 3700-3500 sharp or 3200-3600 broad(H-bonded) 2800-3600 very broad 3300-3500 ROH RCO 2 H RCONHR R 2 NH C C H C C H C C H RCHO 3000-3200 2700-2800 3100-3300 2850-3000 C C O C C C C C sp Region Acetylenes Nitriles Ketenes Allenes C N 2100 2200 2150 1950 Double Bond Region C C Alkenes Imines Nitro
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