1. **Peak at 1376 cm⁻¹ (Height: 0.20, Weak, Sharp):** - **Wavenumber Assignment:** 1376 cm⁻¹ - **Functional Group/Bond Vibration:** C-H bending (methyl or methylene groups). - **Justification:** Weak sharp peaks around 1370–1400 cm⁻¹ are characteristic of symmetric bending vibrations of C-H bonds in aliphatic chains.
2. **Peak at 1460 cm⁻¹ (Height: 0.39, Medium, Sharp):** - **Wavenumber Assignment:** 1460 cm⁻¹ - **Functional Group/Bond Vibration:** C-H bending (methyl or methylene groups). - **Justification:** Medium sharp peaks in the 1450–1470 cm⁻¹ range are attributed to asymmetric bending vibrations of C-H bonds in aliphatic chains.
3. **Peak at 2858 cm⁻¹ (Height: 0.71, Strong, Sharp):** - **Wavenumber Assignment:** 2858 cm⁻¹ - **Functional Group/Bond Vibration:** C-H stretching (symmetric). - **Justification:** Strong sharp peaks around 2850–2870 cm⁻¹ are indicative of symmetric C-H stretching vibrations in aliphatic hydrocarbons.
4. **Peak at 2926 cm⁻¹ (Height: 1.00, Strong, Broad):** - **Wavenumber Assignment:** 2926 cm⁻¹ - **Functional Group/Bond Vibration:** C-H stretching (asymmetric). - **Justification:** Strong broad peaks in the 2900–2950 cm⁻¹ range correspond to asymmetric C-H stretching vibrations in aliphatic hydrocarbons.
**Conclusion:** The FTIR spectrum indicates the presence of aliphatic hydrocarbon groups, as evidenced by characteristic C-H bending and stretching vibrations. The peaks at 1376 cm⁻¹ and 1460 cm⁻¹ correspond to symmetric and asymmetric C-H bending, while the peaks at 2858 cm⁻¹ and 2926 cm⁻¹ are attributed to symmetric and asymmetric C-H stretching, respectively. These features are consistent with the presence of methyl (–CH₃) and methylene (–CH₂–) groups. The absence of peaks in the 1600–1800 cm⁻¹ range (C=O) or 3200–3600 cm⁻¹ range (O-H or N-H) suggests the absence of carbonyl, hydroxyl, or amine functionalities. The compound is likely a simple aliphatic hydrocarbon, such as an alkane or a long-chain fatty acid derivative.
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
**Analysis of FTIR Spectrum:**
1. **Peak at 1376 cm⁻¹ (Height: 0.20, Weak, Sharp):**
- **Wavenumber Assignment:** 1376 cm⁻¹
- **Functional Group/Bond Vibration:** C-H bending (methyl or methylene groups).
- **Justification:** Weak sharp peaks around 1370–1400 cm⁻¹ are characteristic of symmetric bending vibrations of C-H bonds in aliphatic chains.
2. **Peak at 1460 cm⁻¹ (Height: 0.39, Medium, Sharp):**
- **Wavenumber Assignment:** 1460 cm⁻¹
- **Functional Group/Bond Vibration:** C-H bending (methyl or methylene groups).
- **Justification:** Medium sharp peaks in the 1450–1470 cm⁻¹ range are attributed to asymmetric bending vibrations of C-H bonds in aliphatic chains.
3. **Peak at 2858 cm⁻¹ (Height: 0.71, Strong, Sharp):**
- **Wavenumber Assignment:** 2858 cm⁻¹
- **Functional Group/Bond Vibration:** C-H stretching (symmetric).
- **Justification:** Strong sharp peaks around 2850–2870 cm⁻¹ are indicative of symmetric C-H stretching vibrations in aliphatic hydrocarbons.
4. **Peak at 2926 cm⁻¹ (Height: 1.00, Strong, Broad):**
- **Wavenumber Assignment:** 2926 cm⁻¹
- **Functional Group/Bond Vibration:** C-H stretching (asymmetric).
- **Justification:** Strong broad peaks in the 2900–2950 cm⁻¹ range correspond to asymmetric C-H stretching vibrations in aliphatic hydrocarbons.
**Conclusion:**
The FTIR spectrum indicates the presence of aliphatic hydrocarbon groups, as evidenced by characteristic C-H bending and stretching vibrations. The peaks at 1376 cm⁻¹ and 1460 cm⁻¹ correspond to symmetric and asymmetric C-H bending, while the peaks at 2858 cm⁻¹ and 2926 cm⁻¹ are attributed to symmetric and asymmetric C-H stretching, respectively. These features are consistent with the presence of methyl (–CH₃) and methylene (–CH₂–) groups. The absence of peaks in the 1600–1800 cm⁻¹ range (C=O) or 3200–3600 cm⁻¹ range (O-H or N-H) suggests the absence of carbonyl, hydroxyl, or amine functionalities. The compound is likely a simple aliphatic hydrocarbon, such as an alkane or a long-chain fatty acid derivative.
This discussion presents an infrared spectral analysis combining automated interpretation with reference comparison to support functional group identification and structural assessment.