**Data:** * Peak at 1018 cm⁻¹: Height 0.55, medium, broad. * Peak at 1108 cm⁻¹: Height 1.00, strong, broad. * Peak at 1409 cm⁻¹: Height 0.43, medium, broad. * Peak at 1713 cm⁻¹: Height 0.88, strong, broad.
**Analysis:** * **1713 cm⁻¹ (strong, broad):** This peak falls within the characteristic range for carbonyl (C=O) stretching vibrations (typically 1680-1750 cm⁻¹). The broad nature suggests the presence of hydrogen bonding, commonly associated with carboxylic acids (O-H···O=C) or possibly amides. * **1409 cm⁻¹ (medium, broad):** This region (1390-1450 cm⁻¹) is complex. It can correspond to O-H in-plane bending in carboxylic acids, C-H bending vibrations (e.g., in CH₂/CH₃ groups), or C-N stretching in amines/amides. The broadness is consistent with O-H bending in carboxylic acids. * **1108 cm⁻¹ (strong, broad) and 1018 cm⁻¹ (medium, broad):** These peaks are in the fingerprint and C-O stretching region (1000-1300 cm⁻¹). Strong, broad absorptions here are highly characteristic of C-O stretching vibrations in alcohols, phenols, or carboxylic acids, often overlapping with O-H bending modes. The specific positions suggest possible contributions from primary or secondary alcohols/phenols (C-O stretch ~1050-1150 cm⁻¹) and/or carboxylic acids (C-O stretch and O-H deformation ~1210-1320 cm⁻¹, potentially shifted/broadened).
**Conclusion / Inference:** The FTIR spectrum is dominated by broad absorptions indicative of strong hydrogen bonding. The key features are: 1. A strong, broad carbonyl stretch at **1713 cm⁻¹**. 2. Strong, broad absorptions in the **1000-1150 cm⁻¹** region. 3. A medium, broad band near **1409 cm⁻¹**.
**[Inference]** The most consistent interpretation, based on the correlation of these broad features, is the presence of a **carboxylic acid functional group (-COOH)**. The 1713 cm⁻¹ peak is assigned to the hydrogen-bonded C=O stretch, the broad bands around 1108 and 1018 cm⁻¹ are attributed to the coupled C-O stretch and O-H deformation, and the 1409 cm⁻¹ band is consistent with O-H in-plane bending. The data are insufficient to determine the specific alkyl or aryl chain (R-group) attached to the acid. No other distinct functional groups (e.g., sharp O-H, primary amine N-H) are clearly evident from the provided peaks.
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
**Data:**
* Peak at 1018 cm⁻¹: Height 0.55, medium, broad.
* Peak at 1108 cm⁻¹: Height 1.00, strong, broad.
* Peak at 1409 cm⁻¹: Height 0.43, medium, broad.
* Peak at 1713 cm⁻¹: Height 0.88, strong, broad.
**Analysis:**
* **1713 cm⁻¹ (strong, broad):** This peak falls within the characteristic range for carbonyl (C=O) stretching vibrations (typically 1680-1750 cm⁻¹). The broad nature suggests the presence of hydrogen bonding, commonly associated with carboxylic acids (O-H···O=C) or possibly amides.
* **1409 cm⁻¹ (medium, broad):** This region (1390-1450 cm⁻¹) is complex. It can correspond to O-H in-plane bending in carboxylic acids, C-H bending vibrations (e.g., in CH₂/CH₃ groups), or C-N stretching in amines/amides. The broadness is consistent with O-H bending in carboxylic acids.
* **1108 cm⁻¹ (strong, broad) and 1018 cm⁻¹ (medium, broad):** These peaks are in the fingerprint and C-O stretching region (1000-1300 cm⁻¹). Strong, broad absorptions here are highly characteristic of C-O stretching vibrations in alcohols, phenols, or carboxylic acids, often overlapping with O-H bending modes. The specific positions suggest possible contributions from primary or secondary alcohols/phenols (C-O stretch ~1050-1150 cm⁻¹) and/or carboxylic acids (C-O stretch and O-H deformation ~1210-1320 cm⁻¹, potentially shifted/broadened).
**Conclusion / Inference:**
The FTIR spectrum is dominated by broad absorptions indicative of strong hydrogen bonding. The key features are:
1. A strong, broad carbonyl stretch at **1713 cm⁻¹**.
2. Strong, broad absorptions in the **1000-1150 cm⁻¹** region.
3. A medium, broad band near **1409 cm⁻¹**.
**[Inference]** The most consistent interpretation, based on the correlation of these broad features, is the presence of a **carboxylic acid functional group (-COOH)**. The 1713 cm⁻¹ peak is assigned to the hydrogen-bonded C=O stretch, the broad bands around 1108 and 1018 cm⁻¹ are attributed to the coupled C-O stretch and O-H deformation, and the 1409 cm⁻¹ band is consistent with O-H in-plane bending. The data are insufficient to determine the specific alkyl or aryl chain (R-group) attached to the acid. No other distinct functional groups (e.g., sharp O-H, primary amine N-H) are clearly evident from the provided peaks.
This discussion presents an infrared spectral analysis combining automated interpretation with reference comparison to support functional group identification and structural assessment.