Infrared Spectroscopy (LS)

Infrared Spectroscopy (LS) - 1950 1750 3 or 4 small humps...

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Infrared (IR) Spectroscopy 18 Lecture Supplement: Infrared Spectroscopy Characteristic IR Stretching Frequencies Functional Group Bond Stretching, cm -1 Intensity Zone 1: 3700 – 3200 cm -1 alcohol O-H 3650 – 3200 variable; usually broad alkyne C-H ~3300 strong amine, amide N-H 3500 – 3300 medium, often broad Zone 2: 3200 – 2700 cm -1 alkane sp 3 C-H 2960 – 2850 variable aryl, vinyl sp 2 C-H 3100 – 3000 variable aldehyde sp 2 C-H ~2900, ~2700 medium, 2 bands carboxylic acid O-H 3000 – 2500 strong, broad Zone 3: 2300 – 2100 cm -1 alkyne C C 2260 – 2100 variable nitrile C N 2260 – 2220 variable Zone 4: 1950 - 1650 cm -1 aldehyde C=O 1740 – 1720 strong amide C=O 1690 – 1650 strong aryl ketone C=O 1700 – 1680 strong carboxylic acid C=O 1725 – 1700 strong ester C=O 1750 – 1735 strong ketone C=O 1750 – 1705 strong enone (C=C-C=O) C=O 1685 – 1665 strong aromatic overtones
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Unformatted text preview: 1950 1750 3 or 4 small humps Zone 5: 1680 1450 cm-1 alkene C=C 1680 1620 variable aromatic C=C ~1600, 1500-1450 variable; 1600 often 2 bands Fingerprint region: < 1450 cm-1 The functional groups in each zone must be learned. (Do lots of problems!) The exact stretching frequency data for each functional group does not need to be memorized. It will be provided on an exam if needed. Lecture Supplement: Infrared Spectroscopy 19 Sample IR Spectra 20 Lecture Supplement: Infrared Spectroscopy Lecture Supplement: Infrared Spectroscopy 21 22 Lecture Supplement: Infrared Spectroscopy Five Zone Analysis Practice Problems Formula: C 6 H 12 O 2 Lecture Supplement: Infrared Spectroscopy 23 Formula: C 8 H 7 N 24 Lecture Supplement: Infrared Spectroscopy Formula: C 2 H 3 ClO 2...
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This note was uploaded on 03/09/2010 for the course CHEM 30B Chem 30B U taught by Professor Miguelgarciagaribay during the Summer '10 term at UCLA.

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Infrared Spectroscopy (LS) - 1950 1750 3 or 4 small humps...

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