What absorbs at 1514 cm⁻¹ in an FTIR spectrum?
A band near 1514 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 1514 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 | 18 | 16 | 1.0 |
| Alkene (C=C) | 11 | 10 | 1.0 |
| Amide | 8 | 8 | 1.0 |
| Methacrylate | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Lignin | 6 | 6 | 1.0 |
| Ring structure | 5 | 5 | 1.0 |
| Secondary amine | 4 | 4 | 1.0 |
| C c single bond | 4 | 4 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| N h | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| C-O single bond | 3 | 3 | 1.0 |
| Ketone | 3 | 3 | 1.0 |
| Ester | 3 | 3 | 1.0 |
| Carboxyl (COOH) | 3 | 3 | 1.0 |
| Carbonyl (C=O) | 3 | 3 | 1.0 |
| Carbohydrate | 2 | 2 | 1.0 |
| Methyl | 1 | 1 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| Hydrogen bond | 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 | 1514, 1035, 1510 | Methacrylate, Aromatic ring | 1 |
| silver nanoparticles | 1514, 1636, 1631 | Methacrylate, 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 1514 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 most intense bands were the carbonyl peak at 1672 cm-1 and the benzene ring stretching at 1514, 1477, and 1392 cm-1.”
Armenta 等 - 2005 - FTIR approaches for diuron determination in commer DOI: 10.1021/jf050268f -
Aromatic ring confidence 1.0
“Enzymatic delignification of cm-1 cm-1 this optimized mixture was supported by FTIR studies where peak intensity at 1514 and 1595 corresponding to the aromatic skeletal vibrations of lignin decreased in magnitude after delignification.”
A strategic laccase mediated lignin degradation of lignocellulosic feedstocks for ethanol production DOI: 10.1016/j.indcrop.2016.08.009 -
Acetate confidence 1.0
“TC-DO at 1412 and 779 W-DM had characteristic peaks at 1723 (C=O vibration), 1514,”
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
“Using the intensity ratios of the peaks as out cm-1 cm-1 and 1514 in both spectra could be attributed 1604 indicated in equation (1) we have computed the crystallinity to skeletal vibrations in aromatic ring (C=C) mainly linked index in our”
Das 等 - 2017 - Extraction of xylem fibers from Musa sapientum and DOI: 10.1007/s12221-017-1187-5 -
Aromatic ring confidence 1.0
“cm-1, For E1 (Fig.3a), the intensities of the absorptions at 1514 assigned to the aromatic C=C”
FTIR spectroscopy of woods: a new approach to study the weathering of the carving face of a sculpture DOI: 10.1016/j.saa.2014.10.011 -
Lignin confidence 1.0
“Whereas, cm-1 the FTIR peak observedat 1514 belonged to aromatic skeleton vibrations in guaicyl> syringyl units.”
Majeed 等 - 2017 - Lignin macromolecule's implication in slowing the DOI: 10.1002/star.201600362 -
Alkene (C=C) confidence 1.0
“cm-1 cm-1 cm-1 aromatic), 1635 (C=C stretch, aromatic), 1514 (NH), 1016 (C-O stretch, cm-1 hydroxyl), 669 (=C-H bending, alkene) (Masum et al., 2019).”
Pathak 等 - 2020 - Attenuation of hepatic and breast cancer cells by DOI: 10.1016/j.bcab.2020.101863 -
Acetate confidence 1.0
“The bands located around 1696-1697 cm-1 and around 1595 and 1514 cm-1, on the other hand, were assigned to the C=O stretching (with”
Evaluation of Water Sorption and Solubility and FTIR Spectroscopy of Thermoplastic Orthodontic Retainer Materials Subjected to Thermoforming and Thermocycling DOI: 10.3390/app13085165
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