What absorbs at 3096 cm⁻¹ in an FTIR spectrum?
A band near 3096 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 3096 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 |
|---|---|---|---|
| Water (H2O) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| activated carbon | 3096, 1575, 1210 | Hydroxyl (O-H), Carboxyl (COOH) | 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 3096 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
-
Alkyl C-H confidence 1.0
“Inthiscompeaks (3096 and 3154 were assigned to the CH wag2 ment, we investigate a few of the reported peaks in greater ging and CH stretching vibrations of the ethanol monomer 3 detailandshowthatsomepeaksthatwereassignedtoethanol and dimer”
Hull 等 - 2019 - Comment on Revisiting the formation of cyclic clu DOI: 10.1063/1.5047417 -
Alkene (C=C) confidence 1.0
“LLM confirmed rule peak-group candidate”
Liquid fuel oil produced from plastic based medical wastes by thermal cracking DOI: 10.1038/s41598-021-96424-2 -
Hydroxyl (O-H) confidence 1.0
“LLM confirmed rule peak-group candidate”
Sureshkumar 等 - 2020 - Continuous Phenol Removal Using a Liquid-Solid Cir DOI: 10.3390/en13153839
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