IR - IR: Theory and Interpretation 331L recitation Jeffrey...

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IR: Theory and Interpretation 331L recitation Jeffrey Steen
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IR I nfrar ed Spectroscopy The measure of absorption of Infrared radiation by molecular bonds Three regions Near 400-10 cm -1 Mid 4000-400 cm -1 Far 14000-4000 cm -1
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What does the IR measure?
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spectra Wavenumbers cm -1 (Inverse wavelength) Increase in energy %Transmittance/Absorbance
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Spectra overview
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frequency, cm–1 bond functional group 3640–3610 (s, sh) O–H stretch, free hydroxyl alcohols, phenols 3500–3200 (s,b) O–H stretch, H–bonded alcohols, phenols 3400–3250 (m) N–H stretch primary, secondary amines, amides 3300–2500 (m) O–H stretch carboxylic acids 3330–3270 (n, s) –C(triple bond)C–H: C–H stretch alkynes (terminal) 3100–3000 (s) C–H stretch aromatics 3100–3000 (m) =C–H stretch alkenes 3000–2850 (m) C–H stretch alkanes 2830–2695 (m) H–C=O: C–H stretch aldehydes 2260–2210 (v) C(triple bond)N stretch nitriles 2260–2100 (w) –C(triple bond)C– stretch alkynes
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IR - IR: Theory and Interpretation 331L recitation Jeffrey...

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