What absorbs at 1524 cm⁻¹ in an FTIR spectrum?
A band near 1524 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 1524 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 |
|---|---|---|---|
| Amide | 5 | 5 | 1.0 |
| N h | 4 | 4 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Protein beta sheet | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| graphite | 1524, 1640, 1326 | Alkyl C-H, N h | 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 1524 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
-
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
Nickel adsorption from aqueous solution using lemon peel biomass chemically modified with TiO2 nanoparticles DOI: 10.1016/j.scp.2020.100299 -
Alkyl C-H confidence 1.0
“Vials were subat 1524.26 cm-1, 1308.30 cm-1, and at 839.48 cm-1 was jected to mechanical shaking at 400 rpm for 24 h observed due to C-H stretching, C-C stretching and”
Batool 等 - 2019 - USE OF GLUTARIC ACID TO IMPROVE THE SOLUBILITY AND DOI: 10.32383/appdr/94246 -
confidence 1.0
“Explicitly assigned as G-peak in text.”
Simultaneous Gene Delivery and Tracking through Preparation of Photo-Luminescent Nanoparticles Based on Graphene Quantum Dots and Chimeric Peptides DOI: 10.1038/s41598-017-09890-y -
Amide confidence 1.0
“Assessment of the residual lipids in the biomass namely chitin and chitosan (N-H stretching at 3275 cm-1, after the transesterification and 3095 C =O stretching in amides at 1660 and cm-1 cm-1 1625 Assessment of the residual lipids in the f”
Evaluation and optimisation of direct transesterification methods for the assessment of lipid accumulation in oleaginous filamentous fungi DOI: 10.1186/s12934-021-01542-1 -
Amide confidence 1.0
“LLM confirmed rule peak-group candidate”
Purification and Structural Characterization of the Central Hydrophobic Domain of Oleosin* DOI: 10.1074/jbc.M202721200 -
Secondary amine confidence 1.0
“After the reduction of AgNO3, the shift of the bands from 1538 cm-1 and 1524 cm-1 is attributed to the involvement of the secondary amines in the reduction process and the binding of the (NH) C=O group with nanoparticles.”
Part B: Improvement of the Optical Properties of Cellulose Nanocrystals Reinforced Thermoplastic Starch Bio-Composite Films by Ex Situ Incorporation of Green Silver Nanoparticles from Chaetomorpha linum DOI: 10.3390/polym15092148 -
Aromatic ring confidence 1.0
“The FTIR spectrum of PPP/PEG-NH/Hys/MAB (Figure 3a) exhibited the typical absorption peaks at 2926 and 2869 cm-1 (-CH2-, asymmetric and symmetric stretching vibrations), 1713 cm-1 (C=O, stretching vibration), 1600 and 1524 cm-1 (aromatic C-”
Design and Synthesis of Amphiphilic Graft Polyphosphazene Micelles for Docetaxel Delivery DOI: 10.3390/pharmaceutics15051564 -
confidence 1.0
“In the salt complexes, the carbonyl band appears at the 1629 and the amine band cm-1 at 1524 indicates that the salt has form interaction between the cation group and the nitrogen atom cm-1 complexed with amine group.”
Shaffie 和 Khiar - 2018 - Characterization of Chitosan-starch Blend Based Bi DOI: 10.1063/1.5041232
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