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分享一个红外光谱网站
tussah 发布于 2009-06-25 11:57:43
Characteristic IR Absorption Frequencies of Organic Functional Groups 一个不错的网站
http://organicworldwide.net/infrared/比如下面的内容就是来自这一网站：http://www2.ups.edu/faculty/hanson/Spectroscopy/IR/IRfrequencies.html
Functional Group Type of Vibration Characteristic Absorptions (cm-1) Intensity Alcohol O-H (stretch, H-bonded) 3200-3600 strong, broad O-H (stretch, free) 3500-3700 strong, sharp C-O (stretch) 1050-1150 strong Alkane C-H stretch 2850-3000 strong -C-H bending 1350-1480 variable Alkene =C-H stretch 3010-3100 medium =C-H bending 675-1000 strong C=C stretch 1620-1680 variable Alkyl Halide C-F stretch 1000-1400 strong C-Cl stretch 600-800 strong C-Br stretch 500-600 strong C-I stretch 500 strong Alkyne C-H stretch 3300 strong,sharp 
stretch 2100-2260 variable, not present in symmetrical alkynes Amine N-H stretch 3300-3500 medium (primary amines have two bands; secondary have one band, often very weak) C-N stretch 1080-1360 medium-weak N-H bending 1600 medium Aromatic C-H stretch 3000-3100 medium C=C stretch 1400-1600 medium-weak, multiple bands Analysis of C-H out-of-plane bending can often distinguish substitution patterns Carbonyl Detailed Information on Carbonyl IR C=O stretch 1670-1820 strong (conjugation moves absorptions to lower wave numbers) Ether C-O stretch 1000-1300 (1070-1150) strong Nitrile CN stretch 2210-2260 medium Nitro N-O stretch 1515-1560 & 1345-1385 strong, two bands
IR Absorption Frequencies of Functional Groups Containing a Carbonyl (C=O) Functional Group Type of Vibration Characteristic Absorptions (cm-1) Intensity Carbonyl C=O stretch 1670-1820 strong (conjugation moves absorptions to lower wave numbers) Acid C=O stretch 1700-1725 strong O-H stretch 2500-3300 strong, very broad C-O stretch 1210-1320 strong Aldehyde C=O stretch 1740-1720 strong =C-H stretch 2820-2850 & 2720-2750 medium, two peaks Amide C=O stretch 1640-1690 strong N-H stretch 3100-3500 unsubstituted have two bands N-H bending 1550-1640 Anhydride C=O stretch 1800-1830 & 1740-1775 two bands Ester C=O stretch 1735-1750 strong C-O stretch 1000-1300 two bands or more Ketone acyclic stretch 1705-1725 strong cyclic stretch 3-membered - 1850
4-membered - 1780
5-membered - 1745
6-membered - 1715
7-membered - 1705strong a,b-unsaturated stretch 1665-1685 strong aryl ketone stretch 1680-1700 strong
A good general reference for more detailed information on interpretation of infrared spectra (as well as other spectroscopic techniques) is Silverstein, R.M.; Bassler, G.C.; and Morrill, T.C. Spectrometric Identification of Organic Compounds. 4th ed. New York: John Wiley and Sons, 1981. QD272.S6 S55
A more complete listing of functional group absorption frequencies ma be found in: Nakanishi, Koji Infrared Absorption Spectroscopy. QD95.N383
