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Unformatted text preview: Useful Spectroscopic Data Important Infrared Absorptions Type of Absorption Frequency, cm 1 , (Intensity) Comment Alkanes CH stretch 28503000 (m) occurs in all compounds with aliphatic CH bonds Alkenes C=C stretch CH=CH 2 1640 (m) C CH 2 1655 (m) others 16601675 (w) not observed if alkene is symmetrical =CH stretch 30003100 (m) =CH bend CH=CH 2 910990 (s) C CH 2 890 (s) C C H H 960980 (s) C C H H 675730 (s) position is highly variable C C H 800840 (s) Alcohols and Phenols OH stretch 32003400 (s) CO stretch 10501250 (s) also present in other compounds with CO bonds: ethers, esters, etc. Alkynes C C stretch 21002200 (m) not present or weak in many internal alkynes CH stretch 3300 (s) present only in terminal alkynes Aromatic Compounds C=C stretch 1500, 1600 (s) two absorptions CH bend 650750 (s) overtone 16602000 (w) Aldehydes C=O stretch ordinary 17201725 (s) , -unsaturated 16801690 (s) benzaldehydes...
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This note was uploaded on 10/10/2010 for the course CH 54600 taught by Professor Colorpart during the Fall '10 term at University of Texas at Austin.
- Fall '10