Interpret IR Spectrum

Analyze infrared absorption spectra to identify functional groups, assess hydrogen bonding, and compile a comprehensive inventory of structural features present in the sample.

When to Use

• Identifying functional groups in an unknown compound as a first screening step
• Confirming the presence or absence of specific functional groups (e.g., verifying a reaction converted an alcohol to a ketone)
• Monitoring reaction progress by tracking the appearance or disappearance of characteristic absorptions
• Distinguishing between similar compounds that differ in functional group content
• Complementing NMR and mass spectrometry data with vibrational information

Inputs

• Required: IR spectrum data (absorption frequencies in cm-1 with intensities, either as %Transmittance or Absorbance plot)
• Required: Sample preparation method (KBr pellet, ATR, Nujol mull, thin film, solution cell)
• Optional: Molecular formula or expected compound class
• Optional: Known structural fragments from other spectroscopic data
• Optional: Instrument parameters (resolution, scan range, detector type)