Infrared Spectroscopy, Example #4

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Analysis: C₈H₇N Help with Analysis

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IR Spectrum

Correlation Table	Common Absorbances	Interpret IR
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From the molecular formula, the compound has "6 degrees of unsaturation" (six double bonds, carbonyls or rings). The large number suggests the possible presence of an aromatic ring (4 degrees of unsaturation).

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3400-3200 cm-1:	no peak which would indicate OH or NH
3100 cm-1:	strong peak suggesting unsaturated CH
2900 cm-1:	moderate peak indicating saturated CH
2250 cm-1:	strong absorbance indicating an unsymmetrical triple bond
1720 cm-1:	no carbonyl absorbance
1450-1600 cm-1:	moderate absorbance bands consistent with aromatic carbon-carbon double bonds

The spectrum seems to be consistent with a nitrile (CN) containing both single and double bonds. The large number of degrees of unsaturation suggest the presence of an aromatic ring.

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Structure:

IUPAC Name: benzyl nitrile

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