Infrared Spectroscopy

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Last updated 9:46 PM on 4/22/26
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7 Terms

1
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Bonds in a molecule absorb ... radiation + v...

Different bonds absorb at specific wavenumbers - unique p...

IR, vibrate, peaks

2
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IR identifies f... g..., checks purity (extra peaks = impure) + monitor r... progress

functional groups, reaction

3
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A v... must cause a net change in the m... d... m... for it to absorb IR.

vibration, molecules dipole moment

4
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Fingerprint region: u... to each molecule

Region below ...cm⁻¹

unique, 1500

5
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O-H alcohol vs O-H acid:

O-H alcohol = l... peak + more d... C-H stretch

O-H acid = b... + o... the C-H stretch

larger, defined, broad, overlaps

6
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C=C vs C=O:

C=C = n... + s...

C=O = more i... + d...

narrower, shorter, intense, deeper

7
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Alcohol: broad O-H, no C=O

Aldehyde: C=O, some C-H

Ketone: ...? only

Carboxylic acid: broad O-H + C=O

Ester: C=O + strong C-O, no O-H

C=O