**Analysis:** * **Region 4000-2500 cm⁻¹ (X-H Stretching):** * **2846, 2913, 2944, 2978 cm⁻¹:** C-H stretching vibrations (symmetric & asymmetric) of aliphatic -CH₂- and -CH₃ groups. The sharpness suggests relatively ordered or isolated alkyl chains. * **3031 cm⁻¹ (weak, broad):** Aromatic or alkene C-H stretching. * **2372, 2503 cm⁻¹:** These are not typical for fundamental organic vibrations. **[Speculation]** They may correspond to overtone/combination bands or, more likely, are artifacts or indicate the presence of specific impurities (e.g., weakly absorbed atmospheric CO₂ near 2350 cm⁻¹, or P-H/S-H stretches if present, but data is insufficient for confirmation). * **2738, 2760 cm⁻¹:** **[Speculation]** Possibly Fermi resonance bands associated with an aldehyde C-H stretch, but a corresponding strong carbonyl band would be expected near 1725 cm⁻¹. * **3136-3988 cm⁻¹ (numerous weak, sharp peaks):** This pattern is highly atypical for common organic materials. **[Speculation]** It strongly suggests the presence of isolated, non-hydrogen-bonded O-H groups (free hydroxyls, ~3600-3700 cm⁻¹) and/or N-H groups, potentially in a crystalline or non-interacting state. The multiplicity may indicate a complex mixture, adsorbed water with varying hydrogen-bonding strengths, or specific mineral/inorganic hydroxide components (e.g., Si-OH, Al-OH). The sharpness implies minimal intermolecular interaction for these specific X-H oscillators.
* **Region 1800-1500 cm⁻¹ (Double Bond Region):** * **1734 cm⁻¹ (medium, broad):** C=O stretching vibration. The breadth suggests possible hydrogen bonding or the presence of different carbonyl types (e.g., ester, carboxylic acid). * **1637 cm⁻¹ (medium, sharp):** Likely C=C stretching (alkene or aromatic ring quadrant stretch) and/or N-H bending (amide I/II region). A conjugated carbonyl could also contribute here. * **1557 cm⁻¹ (medium, broad):** N-H in-plane bending (amide II) and/or C=C aromatic stretching. * **1472, 1416 cm⁻¹:** C-H bending vibrations of -CH₂- and -CH₃ groups.
* **Region 1500-400 cm⁻¹ (Fingerprint Region):** * **1367, 1290, 1257 cm⁻¹:** C-H bending, C-O stretching (in esters, acids, phenols), C-N stretching, or O-H bending. * **1180, 1132, 1096 cm⁻¹ (strong):** Dominant peaks indicating C-O-C asymmetric stretching (ethers, esters), C-O stretching (alcohols, acids), Si-O-Si stretching (if silica-based), or S=O stretching. The strong, broad feature at 1096 cm⁻¹ is particularly characteristic of a heavily hydrogen-bonded network or Si-O-Si in silicates. * **956 cm⁻¹ (medium, broad):** Possibly =C-H out-of-plane bending, P-O-C stretching, or Si-OH stretching. * **802, 730 cm⁻¹ (strong/medium):** Aromatic C-H out-of-plane bending (para- or 1,2,4-trisubstituted patterns) and/or rocking vibrations of -(CH₂)ₙ- chains (n≥4). The 669 cm⁻¹ (strong, broad) peak may also relate to aromatic substitution or C-S/C-Cl stretches. * **[Speculation]** The pattern of strong, broad peaks below 1200 cm⁻¹, combined with the complex high-wavenumber region, is suggestive of a material containing both organic functional groups and an inorganic component (e.g., a silicate, modified clay, or a composite).
**Conclusions
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 → Analysis → Conclusions/Inferences**
**Data:**
Provided FTIR peaks (cm⁻¹, relative intensity, shape): 669 (0.71, strong, broad), 730 (0.62, medium, sharp), 802 (0.73, strong, broad), 956 (0.62, medium, broad), 1096 (1.00, strong, broad), 1132 (0.91, strong, sharp), 1180 (0.99, strong, broad), 1257 (0.65, medium, sharp), 1290 (0.44, medium, sharp), 1367 (0.47, medium, sharp), 1416 (0.51, medium, broad), 1472 (0.44, medium, sharp), 1557 (0.59, medium, broad), 1637 (0.41, medium, sharp), 1734 (0.65, medium, broad), 2372 (0.24, weak, broad), 2503 (0.21, weak, sharp), 2738 (0.20, weak, broad), 2760 (0.21, weak, sharp), 2846 (0.34, medium, sharp), 2913 (0.27, weak, broad), 2944 (0.12, weak, sharp), 2978 (0.18, weak, sharp), 3031 (0.19, weak, broad), 3136-3988 (multiple weak, sharp/broad peaks).
**Analysis:**
* **Region 4000-2500 cm⁻¹ (X-H Stretching):**
* **2846, 2913, 2944, 2978 cm⁻¹:** C-H stretching vibrations (symmetric & asymmetric) of aliphatic -CH₂- and -CH₃ groups. The sharpness suggests relatively ordered or isolated alkyl chains.
* **3031 cm⁻¹ (weak, broad):** Aromatic or alkene C-H stretching.
* **2372, 2503 cm⁻¹:** These are not typical for fundamental organic vibrations. **[Speculation]** They may correspond to overtone/combination bands or, more likely, are artifacts or indicate the presence of specific impurities (e.g., weakly absorbed atmospheric CO₂ near 2350 cm⁻¹, or P-H/S-H stretches if present, but data is insufficient for confirmation).
* **2738, 2760 cm⁻¹:** **[Speculation]** Possibly Fermi resonance bands associated with an aldehyde C-H stretch, but a corresponding strong carbonyl band would be expected near 1725 cm⁻¹.
* **3136-3988 cm⁻¹ (numerous weak, sharp peaks):** This pattern is highly atypical for common organic materials. **[Speculation]** It strongly suggests the presence of isolated, non-hydrogen-bonded O-H groups (free hydroxyls, ~3600-3700 cm⁻¹) and/or N-H groups, potentially in a crystalline or non-interacting state. The multiplicity may indicate a complex mixture, adsorbed water with varying hydrogen-bonding strengths, or specific mineral/inorganic hydroxide components (e.g., Si-OH, Al-OH). The sharpness implies minimal intermolecular interaction for these specific X-H oscillators.
* **Region 1800-1500 cm⁻¹ (Double Bond Region):**
* **1734 cm⁻¹ (medium, broad):** C=O stretching vibration. The breadth suggests possible hydrogen bonding or the presence of different carbonyl types (e.g., ester, carboxylic acid).
* **1637 cm⁻¹ (medium, sharp):** Likely C=C stretching (alkene or aromatic ring quadrant stretch) and/or N-H bending (amide I/II region). A conjugated carbonyl could also contribute here.
* **1557 cm⁻¹ (medium, broad):** N-H in-plane bending (amide II) and/or C=C aromatic stretching.
* **1472, 1416 cm⁻¹:** C-H bending vibrations of -CH₂- and -CH₃ groups.
* **Region 1500-400 cm⁻¹ (Fingerprint Region):**
* **1367, 1290, 1257 cm⁻¹:** C-H bending, C-O stretching (in esters, acids, phenols), C-N stretching, or O-H bending.
* **1180, 1132, 1096 cm⁻¹ (strong):** Dominant peaks indicating C-O-C asymmetric stretching (ethers, esters), C-O stretching (alcohols, acids), Si-O-Si stretching (if silica-based), or S=O stretching. The strong, broad feature at 1096 cm⁻¹ is particularly characteristic of a heavily hydrogen-bonded network or Si-O-Si in silicates.
* **956 cm⁻¹ (medium, broad):** Possibly =C-H out-of-plane bending, P-O-C stretching, or Si-OH stretching.
* **802, 730 cm⁻¹ (strong/medium):** Aromatic C-H out-of-plane bending (para- or 1,2,4-trisubstituted patterns) and/or rocking vibrations of -(CH₂)ₙ- chains (n≥4). The 669 cm⁻¹ (strong, broad) peak may also relate to aromatic substitution or C-S/C-Cl stretches.
* **[Speculation]** The pattern of strong, broad peaks below 1200 cm⁻¹, combined with the complex high-wavenumber region, is suggestive of a material containing both organic functional groups and an inorganic component (e.g., a silicate, modified clay, or a composite).
**Conclusions
This discussion presents an infrared spectral analysis combining automated interpretation with reference comparison to support functional group identification and structural assessment.