What absorbs at 2082 cm⁻¹ in an FTIR spectrum?
A band near 2082 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 4 cited sources
Quick answer
A band near 2082 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 |
|---|---|---|---|
| Thiocarbonyl | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 1.0 |
| C#c | 1 | 1 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
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 2082 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
-
confidence 1.0
“FTIR cm-1 of 1% Pt/CeO shows a strongly adsorbed CO peak at 2082 corresponding to oxidized Pt.”
Bera 等 - 2003 - Promoting effect of CeO2 in combustion synthesized DOI: 10.1021/jp022132f -
Hydroxyl (O-H) confidence 1.0
“Penicillin conjugated (C≡C silver nanoparticles and plant extracts exhibited characteristic bands at 3,370 (O-H Stretching), 2082 Stretching), 1699 (C = C isolated), 1644 (C = C isolated), 1,423 (C-H bending), 1,368 (C-H Bending), 1,234 (C-”
Murei 等 - 2020 - Functionalization and antimicrobial evaluation of DOI: 10.1038/s41598-020-68290-x -
C=n confidence 1.0
“The peak at 2082 corresponds to the stretching vibrations of -N=C=S group in the dye.”
Siami 等 - 2015 - DOI: 10.4152/pea.201501023 -
C#c confidence 0.9
“Text: 'characteristic absorbance for alkynes was observed in PGG, AHGG and EHGG in the range 2082.3399 cm-1 to 2236.7423 cm-1'”
Hydrolysis, Microstructural Profiling and Utilization of Cyamopsis tetragonoloba in Yoghurt DOI: 10.3390/fermentation9010045
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