What absorbs at 1507 cm⁻¹ in an FTIR spectrum?
A band near 1507 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 1507 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 |
|---|---|---|---|
| Aromatic ring | 11 | 10 | 1.0 |
| Alkene (C=C) | 6 | 5 | 1.0 |
| Lignin | 5 | 5 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 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 |
| Amide | 1 | 1 | 0.7 |
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 |
|---|---|---|---|
| polyethylene | 1507, 1737, 1720 | Aromatic ring, Carboxyl (COOH) | 1 |
| kraft lignin | 1507, 1744, 1710 | Aromatic ring, Carboxyl (COOH) | 1 |
| CS | 1507, 1645, 1720 | Carboxyl (COOH) | 1 |
| biomass | 1507, 1082, 1282 | Aromatic ring | 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 1507 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
-
Aromatic ring confidence 1.0
“The cm-1 peak 1507 could be attributed to an aromatic skeletal of lignin from lignocellulosic cm-1 materials and the medium band at 1268 is attributed to C-O stretching of phenol in lignite”
Optimization of primary sewage sludge and coal lignite by microwave assisted pyrolysis for the production of bio oil DOI: 10.1080/09593330.2020.1797903 -
Acetate confidence 1.0
“The peak at 1507 was related to cm-1 C-O and C-C vibrations.”
Radiation Synthesis of Edible Coating Films of Nanocurcumin Based on Carboxymethyl Chitosan/Polyvinyl Alcohol to Extend the Shelf Life of Sweet Orange "Valencia" DOI: 10.1007/s10924-023-02854-6 -
Lignin confidence 1.0
“LLM confirmed rule peak-group candidate”
Elmas 和 Yilgor - 2020 - Chemical and Thermal Characterizations of Pinus sy DOI: 10.1515/hf- -
Aromatic ring confidence 1.0
“= I and I 2920, which are defined as the ratio between the heights of known marker bands of lignin (C 898 cm-1) cm-1 C aromatic stretching vibrations at 1507 and cellulose (C-H stretching of methylene groups at 2920 cm-1).”
Gomez-Martin 等 - 2020 - On the chemical composition and pyrolytic behavior DOI: 10.1016/j.egyr.2019.09.065 -
confidence 1.0
“Characteristic absorption bands have also been observed for raw EZT related to acteristic absorption bands have also been observed for raw EZT related to O-H stretching cm-1 cm-1, β-lactam O-H stretching vibrations at 3430 and 3265 C=O stre”
Preformulation Studies of Ezetimibe-Simvastatin Solid Dispersions in the Development of Fixed-Dose Combinations DOI: 10.3390/pharmaceutics14050912 -
Aromatic ring confidence 1.0
“cm-1): cm-1 • C=C of aromatic ring (1650-1450 The peak centered at 1507 attributed to the aromatic stretching of the C=C bond of the polybasic acid part of the alkyd binder, was no longer present in infrared spectra of mirror A1 exposed at”
Chemical Degradation and Color Changes of Paint Protective Coatings Used in Solar Glass Mirrors DOI: 10.3390/coatings11040476 -
Carboxyl (COOH) confidence 1.0
“aliphatic C-H asymmetric stretching 1598 asymmetric carboxylate stretching 1416 symmetrical carboxylate stretch 1507”
Lazzari 等 - 2019 - Kraft lignin and polyethylene terephthalate blends DOI: 10.1590/0104-1428.06618 -
Lignin confidence 1.0
“The absorption peaks at 1595 and 1507 cm-1 indicate the skeleton vibration of lignin, and the intensity of the absorption peak did not change noticeably.”
Long 等 - 2021 - Effect of Hot-pressing Process on Mechanical Prope DOI: 10.5552/drind.2017.1641
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