What absorbs at 3095 cm⁻¹ in an FTIR spectrum?
A band near 3095 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 5 cited sources
Quick answer
A band near 3095 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 | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 0.8 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| membrane | 3095, 1316, 2927 | Alkyl C-H, Hydroxyl (O-H), Amide | 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 3095 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
-
Hydroxyl (O-H) confidence 1.0
“3328 3327 O-H stretching, broad 3095 3095 3095”
Differentiation between copal and amber by their structure and thermal behaviour DOI: 10.1007/s10973-023-12333-8 -
Amide confidence 1.0
“metric stretching bands respectively at 2875 and glues It should be noticed that these CH stretching bands appear ]OH 3570 better resolved in the spectrum of casein, with CH3 groups ] 3370 asNH of greater intensity than CH2 groups, whereas”
Invernizzi 等 - 2018 - Mid and Near-Infrared Reflection Spectral Database DOI: 10.1155/2018/7823248 -
Alkene (C=C) confidence 1.0
“cm-1, compounds (bands at 936 attributed to the C-H DMN-co-GMA1+A 100 ________ ________DMN-co-GMA2+A cm-1, deformation vibration of vinyl group, at 1650 rela________ DMN-co-GMA3+A 80 cm-1-to ________ ted to the C=C stretching vibrations and”
Maciejewska 和 Rogulska - 2019 - Insight into functionalized DMN-co-GMA copolymers DOI: 10.1007/s10973-019-08327-0 -
Hydroxyl (O-H) confidence 1.0
“The transmittance at 3095.27 cm-1 appeared to be due to the presence of the hydroxyl group and C-H group stretching present in beta-amyrin and cholesterol in the gazania extract [43];”
Antioxidant and Organic Dye Removal Potential of Cu-Ni Bimetallic Nanoparticles Synthesized Using Gazania rigens Extract DOI: 10.3390/w13192653 -
Aromatic ring confidence 0.8
“Text: 'The absorption peak at matic ring is assigned at'”
Gercel 等 - 2016 - Polymer Electrolyte Membrane Fuel Cell Performance DOI: 10.1155/2016/6123213
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