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Infrared Spectroscopy, Example #5
Analysis: C7H6O
Help with Analysis
IR Spectrum
| Correlation Table | Common Absorbances | Interpret IR |
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|
Infrared Spectroscopy, Example #5
Analysis: C7H6O
Help with Analysis
IR Spectrum
| Correlation Table | Common Absorbances | Interpret IR |
| Give Structure | Next Example | Return to IR Home |
From the molecular formula, the compound has "5 degrees of unsaturation" (five double bonds, carbonyls or rings). The large number suggests the possible presence of an aromatic ring (4 degrees of unsaturation).
| 3400-3200 cm-1: | no peak which would indicate OH or NH |
| 3100 cm-1: | moderate peak indicating unsaturated CH |
| 2900 cm-1: | no peaks to indicate saturated CH |
| 2750-2600 cm-1: | moderate peaks strongly suggesting aldehydic CH |
| 2250 cm-1: | no absorbance indicating an unsymmetrical triple bonds |
| 1700 cm-1: | strong carbonyl absorbance |
| 1450-1600 cm-1: | moderate absorbance bands consistent with aromatic carbon-carbon double bonds |
The spectrum seems to be consistent with an aldehyde containing no saturated carbon. The large number of degrees of unsaturation suggest the presence of an aromatic ring.
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