What absorbs at 1513 cm⁻¹ in an FTIR spectrum?
A band near 1513 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 1513 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 | 15 | 13 | 1.0 |
| Amide | 5 | 4 | 1.0 |
| Ring structure | 4 | 4 | 1.0 |
| Lignin | 4 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Alkene (C=C) | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Sulfur heterocycle | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
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 |
|---|---|---|---|
| lignin | 1513, 1035, 1510 | Lignin, Aromatic ring | 2 |
| polypropylene | 1513, 1030, 1600 | Amide | 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 1513 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
-
Acetate confidence 1.0
“Table 3, According to the IR data in W-DHS has characteristic peaks at 1513, 1377, 1194 and cm-1 corresponding to the characteristic peaks of TC-DHS at 1727 (C=O vibration), 1454, 1057 cm-1.”
Discrimination and similarity evaluation of tissue-cultured and wild Dendrobium species using Fourier Transform Infrared Spectroscopy DOI: 10.1016/j.molstruc.2015.01.027 -
Aromatic ring confidence 1.0
“cm-1 Absorption bands for lignin at 1513 and 1515 indicated aromatic skeletal vibrations which showed the”
Hassan 和 Badri - 2014 - Lignin Recovery from Alkaline Hydrolysis and Glyce DOI: 10.1063/1.4895236 -
Aromatic ring confidence 1.0
“1267 O-C-O and Guaiacyl ring Stretching vibration in lignin and xylan 1231 1234 O-C-O and Syringyl ring Stretching vibration in lignin and xylan 1513 1508 Aromatic skeletal vibrations in extractives and lignin 1205”
Jin 等 - 2022 - Rapid Identification for the Pterocarpus Bracelet DOI: 10.3390/molecules27154793 -
Aromatic ring confidence 1.0
“Bands aromatic ring modes (1513 and 1597”
Effect of high CO2 concentration on char formation through mineral reaction during biomass pyrolysis DOI: 10.1016/j.proci.2012.07.048 -
C c single bond confidence 1.0
“cm-1) stretching peaks (1566, 1507, 1560 and 1513 and the C-C aromatic stretching peaks (1614, 1507, 1442, 1626, 1513 cm-1).”
Aamir 和 Ahmad - 2010 - Production and Stability Evaluation of Modified-Re DOI: 10.1208/s12249-010-9392-1 -
Aromatic ring confidence 1.0
“The peaks at 1595 (aromatic C=C stretching), cm-1 cm-1 1513 (aromatic skeletal vibration rings), and 1455 (C-H deformation) were visible in all the composites [16].”
Alassod 等 - 2021 - PolypropyleneLigninPOSS Nanocomposites Thermal DOI: 10.3390/ma14143950 -
Aromatic ring confidence 1.0
“1504 848 25 Non-attributed Aromatic peak 1513 407 12 (Benzene ring) 1531”
Bhattacharyya 等 - 2017 - Metallization and APPJ treatment of bismaleimide DOI: 10.1155/2010/987357 -
Alkene (C=C) confidence 1.0
“The peak at 1513 was derived from the C=C stretching of”
Boonsuk 等 - 2021 - Structure-properties relationships in alkaline tre DOI: 10.1016/j.aiepr.2019.11.003.
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