- 723 cm⁻¹: Rocking vibration of CH₂ groups (—CH₂—CH₂—); strong sharp peak indicates a long-chain alkane or polyethylene. - 790 cm⁻¹: Out-of-plane bending of terminal —CH=CH₂ (vinyl group); medium sharp peak suggests a terminal alkene. - 845 cm⁻¹: Out-of-plane bending of —CH=CH₂; supports terminal alkene presence. - 871 cm⁻¹: Out-of-plane bending of —CH=CH₂; further confirms terminal alkene. - 955 cm⁻¹: =C—H bending (terminal alkene); medium broad peak supports alkene. - 1016 cm⁻¹: C—O stretching (alcohol or ether); medium sharp peak suggests an alcohol or ether. - 1094 cm⁻¹: C—O stretching (alcohol or ether); strong broad peak indicates an alcohol. - 1240 cm⁻¹: C—O stretching (alcohol or ether); strong broad peak supports alcohol. - 1338 cm⁻¹: CH₃ bending (asymmetric); weak sharp peak suggests methyl group. - 1407 cm⁻¹: CH₃ bending (symmetric); weak sharp peak confirms methyl group. - 1472 cm⁻¹: CH₂ bending (scissoring); weak broad peak indicates methylene groups. - 1714 cm⁻¹: C=O stretching (carbonyl); strong broad peak indicates a ketone or aldehyde.
**Conclusion:** The spectrum indicates a compound containing a terminal alkene (—CH=CH₂), a primary alcohol (—OH), and a ketone (C=O). The presence of long-chain methylene groups (723 cm⁻¹) and methyl groups (1338–1407 cm⁻¹) suggests an aliphatic chain. The most likely compound class is a **hydroxyalkene ketone**, such as a 2-alken-1-ol with a ketone group (e.g., 4-penten-2-one-1-ol or similar). The broad peaks at 1094 and 1240 cm⁻¹ confirm alcohol functionality, while the strong 1714 cm⁻¹ peak confirms a ketone. This is consistent with a medium-chain unsaturated alcohol with a ketone group.
This discussion presents an infrared spectral analysis combining
automated interpretation with reference comparison to support
functional group identification and structural assessment.
FTIR Spectrum Interpretation Summary
Comparative Analysis Conclusion
AI-assisted Interpretation Conclusion
- 723 cm⁻¹: Rocking vibration of CH₂ groups (—CH₂—CH₂—); strong sharp peak indicates a long-chain alkane or polyethylene.
- 790 cm⁻¹: Out-of-plane bending of terminal —CH=CH₂ (vinyl group); medium sharp peak suggests a terminal alkene.
- 845 cm⁻¹: Out-of-plane bending of —CH=CH₂; supports terminal alkene presence.
- 871 cm⁻¹: Out-of-plane bending of —CH=CH₂; further confirms terminal alkene.
- 955 cm⁻¹: =C—H bending (terminal alkene); medium broad peak supports alkene.
- 1016 cm⁻¹: C—O stretching (alcohol or ether); medium sharp peak suggests an alcohol or ether.
- 1094 cm⁻¹: C—O stretching (alcohol or ether); strong broad peak indicates an alcohol.
- 1240 cm⁻¹: C—O stretching (alcohol or ether); strong broad peak supports alcohol.
- 1338 cm⁻¹: CH₃ bending (asymmetric); weak sharp peak suggests methyl group.
- 1407 cm⁻¹: CH₃ bending (symmetric); weak sharp peak confirms methyl group.
- 1472 cm⁻¹: CH₂ bending (scissoring); weak broad peak indicates methylene groups.
- 1714 cm⁻¹: C=O stretching (carbonyl); strong broad peak indicates a ketone or aldehyde.
**Conclusion:**
The spectrum indicates a compound containing a terminal alkene (—CH=CH₂), a primary alcohol (—OH), and a ketone (C=O). The presence of long-chain methylene groups (723 cm⁻¹) and methyl groups (1338–1407 cm⁻¹) suggests an aliphatic chain. The most likely compound class is a **hydroxyalkene ketone**, such as a 2-alken-1-ol with a ketone group (e.g., 4-penten-2-one-1-ol or similar). The broad peaks at 1094 and 1240 cm⁻¹ confirm alcohol functionality, while the strong 1714 cm⁻¹ peak confirms a ketone. This is consistent with a medium-chain unsaturated alcohol with a ketone group.
This discussion presents an infrared spectral analysis combining automated interpretation with reference comparison to support functional group identification and structural assessment.