Infrared Spectroscopy: Peak Classification and Characteristic Frequencies
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15 Terms
How can peaks in infrared spectroscopy be classified?
Peaks can be classified as strong, medium, or weak.
What happens when the frequency of the molecular stretch matches the energy of the IR light?
Light is absorbed.
What is the characteristic frequency range for alcohol and phenol in IR spectroscopy?
3200-3600 cm-1, broad and strong.
What is the characteristic frequency range for carboxylic acid in IR spectroscopy?
2500-3200 cm-1, broad and strong.
What is the characteristic frequency range for nitriles (C=N) in IR spectroscopy?
2210-2260 cm-1, medium.
What is the characteristic frequency range for alkenes (sp²) in IR spectroscopy?
3000-3100 cm-1, weak.
What is the characteristic frequency range for ketones and aldehydes in IR spectroscopy?
1680-1750 cm-1, strong.
What is the characteristic frequency range for amides (N-H) in IR spectroscopy?
3350-3500 cm-1, medium.
What is the characteristic frequency range for esters in IR spectroscopy?
1730-1750 cm-1, strong.
What is the characteristic frequency range for alcohols, esters, and ethers (C-O) in IR spectroscopy?
1050-1150 cm-1, medium.
What does it mean if a peak is labeled as variable in intensity?
It means the intensity depends on the specific molecule.
What defines a broad peak in infrared spectroscopy?
A peak width greater than 200 cm-1.
What is the characteristic frequency range for sp alkynes (C-H) in IR spectroscopy?
~3300 cm-1, strong.
What is the characteristic frequency range for carboxylic acid (C=O) in IR spectroscopy?
1710-1780 cm-1, strong.
What is the characteristic frequency range for sp³ alkanes in IR spectroscopy?
2800-3000 cm-1, variable.