What absorbs at 3496 cm⁻¹ in an FTIR spectrum?
A band near 3496 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 3 cited sources
Quick answer
A band near 3496 cm⁻¹ is usually interpreted by checking which functional groups repeatedly co-occur there in the literature, then confirming at least one or two additional peaks in the same sample. This page ranks those assignments by accumulated evidence rather than by a single fixed textbook rule.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Alkyl C-H | 2 | 2 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| N h | 1 | 1 | 0.7 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| polyvinylpyrrolidone | 3496, 1660, 1700 | Alkyl C-H, Hydroxyl (O-H) | 1 |
| CA | 3496, 1045, 1650 | Hydroxyl (O-H), Alkyl C-H | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
This band becomes meaningful only when read with its neighboring peaks. In practice, analysts first look at the assignments above, then check whether the same sample also shows other peaks expected for the same structural motif. A lone band near 3496 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literature behind these assignments
-
Acetate confidence 1.0
“Moreover, the diameter distribution was also widened with the O-H group (3496 cm-1), and the bending vibrations of the CH3 deformation for the acetate increased PVP concentration because of the unstable jet resulting from the addition of mo”
Biomimetic Growth of Hydroxyapatite on Electrospun CA/PVP Core–Shell Nanofiber Membranes DOI: 10.3390/polym10091032 -
Thiol confidence 1.0
“For 4-ATP, it was observed at 3427 and 3348 and calculated at 3630 and 3496 cm-1 In the FT-IR spectrum, the S-H stretching vibration band is observed around 2530 [2, 25, cm-1, 26].”
Kalayci 等 - 2021 - EXPERIMENTAL AND THEORETICAL INVESTIGATIONS (FTIR, DOI: 10.4314/bcse.v35i3.11 -
Hydroxyl (O-H) confidence 1.0
“Recent reports by [37] showed that FTIR spectra of CUR presented a characteristic broad peaks at 3496, 2923, cm-1, and 1513 assigned to phenolic O-H stretching vibrations, aromatic C-H stretching”
The Effects of Curcumin Nanoparticles Incorporated into Collagen-Alginate Scaffold on Wound Healing of Skin Tissue in Trauma Patients DOI: 10.3390/polym13244291
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