Infrared Spectroscopy

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Last updated 4:12 PM on 8/25/26
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12 Terms

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Transmittance

dimensionless ratio of transmitted light to the incident light

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If the molecule absorbs none of the electromagnetic radiation, the transmittance is

1 or 100%

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Absorbance

a measure of the amount of light absorbed by a sample

4
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Wavenumber

inverse of wavelength, therefore, a measurement of frequency. Higher values of wavenumber are equivalent to higher energy

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Draw a line at 3000 cm-1

• sp2 C-H directly to the left

• sp3 C-H directly to the right

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Intense stretches 3500 cm-1 to 3100 cm-1 can only mean four things

alcohol, primary amine, secondary amine, terminal alkyne, carboxyllic acid

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alcohol

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primary amine

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secondary amine

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carboxylic acid

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Anhydrides show a C=O doublet due to the out of phase C=O stretch

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Aldehydes have a characteristic doublet at 2800 cm-1 and 2700 cm-1