Infrared Spectroscopy (AQA A-Level Chemistry): Flashcards

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Infrared Spectroscopy
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What does IR spectroscopy identify?

Functional groups in molecules

Factors affecting vibrational frequency of bonds

Mass of atoms, bond strength & length

Wavenumber range of fingerprint region

Below 1500 cm−1^{-1}

Use of fingerprint region

Confirms identity by comparison to known sample

Wavenumber of C−HC-H stretch

Just under 3000 cm−1^{-1}

Wavenumber of O−HO-H in alcohols

3230-3550 cm−1^{-1} (broad)

Wavenumber of O−HO-H in carboxylic acids

2500-3000 cm−1^{-1} (very broad)

Wavenumber of C=OC=O stretch

1680-1750 cm−1^{-1} (sharp)

Examples of greenhouse gases

CO2_2, CH4_4, water vapour

Why greenhouse gases cause warming

Absorb IR radiation, trapping heat in atmosphere

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Halogenoalkanes

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Alkanes

Halogenoalkanes

Alkenes

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