What absorbs at 1492 cm⁻¹ in an FTIR spectrum?
A band near 1492 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 1492 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.
Attributions possibles de groupes fonctionnels
| Groupe fonctionnel | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Carbonate | 1 | 1 | 1,0 |
| Nitrate | 1 | 1 | 1,0 |
| Lewis acid site | 1 | 0 | 0,7 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
Possible materials
| Matériel | Pics de support | Overlapping groups | Sources citées |
|---|---|---|---|
| polystyrene | 1492, 1020, 1600 | Aromatic ring, Alkyl C-H | 3 |
| Polyethylene | 1492, 1737, 1720 | Alkyl C-H, Aromatic ring | 1 |
| saliva | 1492, 1648, 1664 | Alkyl C-H | 1 |
| hydroxyapatite | 1492, 1620, 1639 | Alkyl C-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 1492 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.
Bibliographie derrière ces attributions
-
Alkyl C-H confiance 1,0
“For PS1, there was cm-1 a peak in the area of 1492.25 to indicate the absorption of the (C-H) group as alkyl.”
Hidayani 等 - 2022 - Acoustic and Mechanical Properties of Polystyrene DOI: 10.37358/Mat.Plast.1964 -
Alkyl C-H confiance 1,0
“For PS, there was a peak at 1492.25 cm-1 indicating the absorption of the indentation of the (C-H) group as alkyl.”
Preparation and Characterization of Sound-Absorbent Based on Polystyrene Reinforced Primary Sludge and Fly Ash from Pulp Mill DOI: 10.14716/ijtech.v14i3.5131 -
Alkyl C-H confiance 1,0
“1506 In-plane CH bending vibration from the phenyl rings 1492 Deformation C-H Table 2.”
Salivary Detection of Zika Virus Infection Using ATR-FTIR Spectroscopy Coupled with Machine Learning Algorithms and Univariate Analysis: A Proof-of-Concept Animal Study DOI: 10.3390/diagnostics13081443 -
Nitrate confiance 1,0
“cm-1 and the combined peaks at 1257 and 1302 can be assigned to monodentate nitrate species adsorbed on the surface of the support.37 TiO Similarly, the two peaks present at 1492 and 2 cm-1 1584 may be assigned to monodentate and bidentate”
Pena 等 - 2004 - Identification of surface species on titania-suppo DOI: 10.1021/jp0313122 -
confiance 1,0
“The intensity may be assigned to OH groups linearly coordinated to cm-1, environments.57,58 of bands at 1492 and 1410 which may be attributed to cations (Zr-Type I) in different A feature at ceriacm-1, residual polydentate carbonates chemis”
Collins 等 - 2007 - Hydrogen interaction with a ceria-zirconia support DOI: 10.1021/jp071968l -
Amide confiance 1,0
“ranges 1510-1700 and 3500-3600 simultaneous with the increase of the absorbance of IR band at cm-1 C=C 1492 attributed to the stretching vibrational mode in compounds of the type aniline [20,22] indicate a decrease in the amide group weight”
Photoluminescence as a Valuable Tool in the Optical Characterization of Acetaminophen and the Monitoring of Its Photodegradation Reactions DOI: 10.3390/molecules25194571 -
Aromatic ring confiance 1,0
“The absorption peaks at 1492 and 1451 represent the stretching vibration bands of aromatic ring C=C contribution from polystyrene [30].”
Fabrication of Europium-Doped Barium Titanate/Polystyrene Polymer Nanocomposites Using Ultrasonication-Assisted Method: Structural and Optical Properties DOI: 10.3390/polym14214664 -
C c single bond confiance 1,0
“Moreover, bands at 1492 and 1451 cm-1were of the C-C stretching vibrations of the benzyl ring and the stretching vibrations of the C-H bond of characteristic of the C-C stretching vibrations of the benzyl ring and the stretching vibrations”
Ramirez-Gomez 等 - 2019 - Synthesis and Characterization of Clay Polymer Nan DOI: 10.3390/polym11040721
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