What absorbs at 1183 cm⁻¹ in an FTIR spectrum?
A band near 1183 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 7 cited sources
Quick answer
A band near 1183 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 |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Fatty acid | 1 | 1 | 1,0 |
| Sulfonate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Oxygen heterocycle | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Amide | 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.
Possible materials
| Matériel | Pics de support | Overlapping groups | Sources citées |
|---|---|---|---|
| SiO2 | 1183, 1739, 699 | Methoxy (OCH3) | 1 |
| graphene oxide | 1183, 1150, 3400 | Methacrylate, Acetate, C-O single bond | 1 |
| GO | 1183, 1720, 1182 | Methacrylate, Acetate, C-O single bond | 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 1183 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
-
Water (H2O) confiance 1,0
“C60FWS (fullerene water system) samples[20] show four vibration bands of C fullerene at 523-526, 571, 1182.560 cm-1, 1183 and 1429 close to the simulated spectra.”
EL-Barbary - 2016 - Hydrogenated Fullerenes in Space FT-IR Spectra an DOI: 10.1063/1.4953126 -
Oxygen heterocycle confiance 1,0
“The slight vibrations at 1183 and 957 cm-1 correspond to epoxy groups (C-O), and”
Sustainable Remedy Waste to Generate SiO2 Functionalized on Graphene Oxide for Removal of U(VI) Ions DOI: 10.3390/su14052699 -
Silicon (Si) confiance 1,0
“and 1239 The tion peaks of C-N appeared at 1290 toxic (cell viability >90%), mild (cell viability 60-90%), modercm-1 was attributed to Si-CH due to the presence peak at 1183 ate (cell viability 30-60%) and severe (30%) (30).”
Khan 等 - 2021 - The Structural, Physical, and In Vitro Biological DOI: 10.14744/eej.2020.36349 -
Acetate confiance 1,0
“At 1578 and 1390 the asymmetric and, respectively, C=O symmetric stretching vibration of the C=O bond from the carboxylate anion are revealed, while the the symmetric stretching vibration of the bond from the carboxylate anion are revealed,”
Stability and Compatibility Studies of Levothyroxine Sodium in Solid Binary Systems—Instrumental Screening DOI: 10.3390/pharmaceutics12010058 -
Sulfonate confiance 1,0
“The peaks at about 1183, 1122 and 1036 cm-1 of LDH-SAS are attributed cm-1 attributed to the stretching vibration of sulfonate groups [41], and the peak at about 833 is the to the stretching vibration of sulfonate groups [41], and the peak”
Aging-Resistant Functionalized LDH–SAS/Nitrile-Butadiene Rubber Composites: Preparation and Study of Aging Kinetics/Anti-Aging Mechanism DOI: 10.3390/ma11050836 -
Acetate confiance 1,0
“O stretch), 1183 approach for recrystallization in presence of ultrasound under cooling cm(cid:0) (C-O-C (C-O-C 1 asymmetrical stretching) and 1045 symmetconditions gives plate / rod type crystals unlike corrugated, porous or rical stretchi”
Improvements in azithromycin recrystallization using ultrasound for size reduction DOI: 10.1016/j.ultsonch.2022.105922 -
Acetate confiance 1,0
“vulgaris) 1183 and 1185 (stretching vibration of group C-O to 1395 cm-1 to 1395 cm-1 (A.”
Identification of Metabolites with Antibacterial Activities by Analyzing the FTIR Spectra of Microalgae DOI: 10.3390/life12091395
Avez-vous un spectre avec cette bande ?
Téléchargez votre spectre FTIR et obtenez un rapport d＇interprétation complet — attributions de pics avec citations bibliographiques, correspondances de bibliothèque et une chaîne de preuves avec évaluation de la confiance — en quelques secondes.