What absorbs at 3006 cm⁻¹ in an FTIR spectrum?
A band near 3006 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 8 cited sources
Quick answer
A band near 3006 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 | 13 | 13 | 1.0 |
| Alkene (C=C) | 8 | 8 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Fatty acid | 3 | 3 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Thiol | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| oil | 3006, 1161, 1163 | Alkyl C-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 3006 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
“The leaves showed to have Pre-pro higher peak intensity of C-H stretching (3006 cm-1) than their strong and broad O-H stretching peak at 3374 cm-1 (Figure 2).”
Azlah 等 - 2020 - A fast and reliable 2D-IR spectroscopic technique DOI: 10.1016/j.vibspec.2019.103014 -
Carboxyl (COOH) confidence 1.0
“3006cm-1 are due to the presence of oleic acid.”
Barnaby 等 - 2018 - Free Radical Scavenging Capacity, Carotenoid Conte DOI: 10.1155/2018/1762342 -
Alkene (C=C) confidence 1.0
“182 cm-1 The weak signal at 3006 correspond to =C-H stretching groups of cis-unsaturated 183 fatty acid which gradually reduced with the order of poultry, porcine, ovine and bovine 184 MBMs (Koca et al., 2010).”
Gao 等 - 2021 - Complementarity of FT-IR and Raman spectroscopies DOI: 10.1016/j.foodchem.2020.128754 -
Alkyl C-H confidence 1.0
“Range, Functional group Nominal frequency Mode of vibration @C-H 3025a 1 3029-2989 (trans) Stretching @C-H 3006a (cis)”
Rapid evaluation of oxidised fatty acid concentration in virgin olive oil using Fourier-transform infrared spectroscopy and multiple linear regression DOI: 10.1016/j.foodchem.2010.06.054 -
Alkyl C-H confidence 1.0
“cm(cid:1)1 paste.37 This roux The peak at 3006 is attributed to the cis-C]CH”
Influence of flaxseed flour as a partial replacement for wheat flour on the characteristics of Chinese steamed bread DOI: 10.1039/d0ra05742h -
Alkene (C=C) confidence 1.0
“LLM confirmed rule peak-group candidate”
Mansour 等 - 2017 - Elucidation of penetration enhancement mechanism o DOI: 10.1016/j.saa.2017.05.026 -
Alkyl C-H confidence 1.0
“Functional group Mode of vibration Intensity --C-H 3006 (cis) Stretching M”
Fourier transform midinfrared spectroscopy evaluation of early stages of virgin olive oil autoxidation DOI: 10.1002/ejlt.201200317 -
Thiol confidence 1.0
“The peak at 3006 characteristic of We have demonstrated in this work that thiol chemistry can nanoparticles adsorbed on the surface is not observed in Fig.”
Shukla 等 - 2006 - FePt nanoparticle adsorption on a chemically patte DOI: 10.1016/j.surfcoat.2006.01.043
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