What absorbs at 3007 cm⁻¹ in an FTIR spectrum?
A band near 3007 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 3007 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 | 10 | 10 | 1.0 |
| Alkene (C=C) | 5 | 5 | 1.0 |
| Fatty acid | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 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 |
|---|---|---|---|
| edible oils | 3007, 1743, 1064 | Alkyl C-H, Alkene (C=C), Fatty acid | 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 3007 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
“In addition, the bands at 3007 based cm(cid:0) cm(cid:0) Calibration (C-- 1 1 (=C-H asymmetric stretching), 1654 C stretching) 1438 cm(cid:0) (C-- 1 =C-H H scissoring deformation), 1258 (cis deformation), and”
Comparison and chemical structure-related basis of species discrimination of animal fats by Raman spectroscopy using near-infrared and visible excitation lasers DOI: 10.1016/j.lwt.2020.110105 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
MacDonald 等 - 2016 - Reaction of Pb(II) and Zn(II) with Ethyl Linoleate DOI: 10.1021/acsomega.6b00075 -
Fatty acid confidence 1.0
“andofsmallchangesintherelativepeakintensity(absorbancies),escm-1 cm-1 pecially at frequency region of about 3007 and 1117 cm-1 Peak area of fatty acid x (Fig.”
The chemometrics approach applied to FTIR spectral data for the analysis of rice bran oil in extra virgin olive oil DOI: 10.1016/j.chemolab.2011.10.010 -
Alkene (C=C) confidence 1.0
“The peaks at 3007 and 3300 In latter case, raw data were expressed in different correspond to C=C and O-H vibrations (Rubio-Diaz cm-1);”
Depciuch 等 - 2018 - Identification of birch pollen species using FTIR DOI: 10.1007/s10453-018-9528-4 -
Alkyl C-H confidence 1.0
“and 3 cm-1 oils from different cultivars, geographical origins, quality finally 3007 regarding the CH stretching vibration of cis grades, analyzed in fresh or after storage [27, 28, 37, 38], double bonds (= C-H).”
Fourier transform infrared spectroscopy-chemometric approach as a non-destructive olive cultivar tool for discriminating Portuguese monovarietal olive oils DOI: 10.1007/s00217-021-03809-8 -
Protein confidence 1.0
“FTIR-ATR spectroscopy as a tool for the rapid detection of adulterations in Andradea, Antonio Iranaldo Nunes Cristina Guimarães Jonathan Maria José Valenzuela Virgílio Nívea Maria 900, Juiz de Fora, Minas Gerais, Brazil Educação, bInstituto”
FTIR-ATR spectroscopy as a tool for the rapid detection of adulterations in butter cheeses DOI: 10.1016/j.lwt.2019.04.017 -
Aromatic ring confidence 1.0
“Aromatic C-H and C=C: the stretching of aromatic C-H bonds was detected as a small cm-1 cm-1 band between 3007 and 3014 in all PF foams [5,24,27,29].”
What about Phenol Formaldehyde (PF) Foam in Modern-Contemporary Art? Insights into the Unaged and Naturally Aged Material by a Multi-Analytical Approach DOI: 10.3390/polym13121964 -
Alkyl C-H confidence 1.0
“The peaks at 3007, 2920 and 2855 are attributed to = C-H stretching vibration, and stretching vibrations of methylene and methyl groups, cm-1 respectively [42].”
Plazzotta 等 - 2021 - Conversion of Whey Protein Aerogel Particles into DOI: 10.3390/polym13234063
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