What absorbs at 3082 cm⁻¹ in an FTIR spectrum?
A band near 3082 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 7 cited sources
Quick answer
A band near 3082 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 | 5 | 5 | 1.0 |
| Alkene (C=C) | 3 | 3 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Styrene | 1 | 0 | 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 |
|---|---|---|---|
| silver nanoparticles | 3082, 1636, 1631 | 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 3082 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
-
Alkene (C=C) confidence 1.0
“Functional groups cm-1 amber amber amber amber C=C stretching 3082”
Chen 等 - 2019 - Baltic amber or Burmese amber FTIR studies on amb DOI: 10.1016/j.saa.2019.117270 -
Alkyl C-H confidence 1.0
“The average spectrum of methylene (CH 2) groups in diterpenoid form with peaks at ~3082,”
Organic geochemistry of resins from modern Agathis australis and Eocene resins from New Zealand: Diagenetic and taxonomic implications DOI: 10.1016/j.coal.2009.07.015 -
Alkene (C=C) confidence 1.0
“the peak of 1655.00 the olefinic C-H out of plane bending vibration at the band of 968.22 cm-1 Furthermore, the peak at 3082.50 corresponds to the =C-H stretching vibrations of both the allyl group and the cm-1 aromatic ring, whereas the ab”
Tan 等 - 2018 - Synthesis and Characterization of Polybenzoxazine DOI: 10.1063/1.5066866 -
Aromatic ring confidence 1.0
“The MSN-Cip spectrum exhibits new the case of MSN-[Ch][Cip], besides the changes in the aromatic stretching region, the peak MSN-[Ch][Cip], besides the changes in the aromatic stretching region, the peak at 1520 bands at 3082, 3042 and 2928”
Boosting Antimicrobial Activity of Ciprofloxacin by Functionalization of Mesoporous Silica Nanoparticles DOI: 10.3390/pharmaceutics13020218 -
Alkyl C-H confidence 1.0
“3026 C - H stretching methyl group 3059 C - H stretching methylene group 3082 C - H stretching methylene group”
Siddaiah 等 - 2018 - DOI: 10.1590/1980-5373-MR-2017-0987 -
Alkyl C-H confidence 1.0
“The peaks at 2926.01, obtained at 3178.60 The peaks at 3082.25, cm-1 2862.36 are associated with symmetric CH 2”
Green synthesis and characterization of silver nanoparticles using Cydonia oblong seed extract DOI: 10.1007/s13204-016-0517-z -
Alkene (C=C) confidence 0.8
“vinyl signal”
Razgon 等 - 2008 - Ozonolysis-based route to the in situ formation of DOI: 10.1021/la703120c
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.