What absorbs at 3247 cm⁻¹ in an FTIR spectrum?
A band near 3247 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 5 cited sources
Quick answer
A band near 3247 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 3 | 1,0 |
| N h | 2 | 0 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Phenolic | 1 | 1 | 0,9 |
| Secondary amine | 1 | 0 | 1,0 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
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 3247 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
-
Hydroxyl (O-H) confiance 1,0
“To extract information from the OH-stretching band, the peak at ~3247 cm-1 and ~3336 cm-1, respectively, separated by the presence of an isosbestic point.”
Hydrating Capabilities of the Biopolymers Produced by the Marine Thermophilic Bacillus horneckiae SBP3 as Evaluated by ATR-FTIR Spectroscopy DOI: 10.3390/ma15175988 -
C c single bond confiance 1,0
“200◦C Zn2+cations, the tion polarizing power of the stronger H-bonds to water of N-bentonite at resulted in the weakening of the OH cm-1) species bending are expected to form in outer coordination spheres, and mode of water (1633 and the C”
Tabak 等 - 2011 - Structural analysis of naproxen-intercalated bento DOI: 10.1016/j.cej.2011.09.027 -
Alkene (C=C) confiance 1,0
“The bands at 3246.58 and 2944.29 correspond to the =C-H stretching vibrations and =C-H asymmetric stretching vibration of the aromatic ring [12, 13].”
Tan 等 - 2018 - Synthesis and Characterization of Polybenzoxazine DOI: 10.1063/1.5066866 -
Hydroxyl (O-H) confiance 1,0
“cm(cid:5)1 bands observed at 3247 for the three seed variant of roasted forhighmetalchelatingpropertiesoftheseedvarietywasobtainedinthe reflexa flours (-OH) Dioclea seed indicates alcohol-phenol groups [36].”
Effect of roasting on the chemical composition, functional characterisation and antioxidant activities of three varieties of marble vine (Dioclea reflexa): An underutilised plant DOI: 10.1016/j.heliyon.2021.e07107 -
Hydroxyl (O-H) confiance 1,0
“RES showed showed characteristic peaks at 3247.35 cm-1 (phenolic O-H), 1616.76 cm-1 (C=O), 1588.91 cm-1 cm-1 cm-1 characteristic peaks at 3247.35 (phenolic O-H), 1616.76 (C=O), 1588.91”
Spray-Drying of Hydroxypropyl -Cyclodextrin Microcapsules for Co-Encapsulation of Resveratrol and Piperine with Enhanced Solubility DOI: 10.3390/cryst12050596
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