What absorbs at 1267 cm⁻¹ in an FTIR spectrum?
A band near 1267 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
Réponse rapide
A band near 1267 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 | 7 | 7 | 1,0 |
| Methacrylate | 7 | 6 | 1,0 |
| Acetate | 7 | 6 | 1,0 |
| Methoxy (OCH3) | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Carboxyl (COOH) | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Carbonyl (C=O) | 2 | 2 | 1,0 |
| Lignin | 2 | 1 | 1,0 |
| S eq o | 1 | 1 | 1,0 |
| Sulfonyl | 1 | 1 | 1,0 |
| Protein beta turn | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Urethane | 1 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 0,9 |
| C=n | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 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.
Logique du spectre
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 1267 cm⁻¹ is usually not enough for material identification by itself.
Utilisation réelle
Ce type de requête est courant dans l＇identification des polymères, le criblage des plastiques inconnus, le dépannage du contrôle qualité, la vérification des matériaux recyclés et l＇examen de l＇attribution des pics appuyée par la littérature.
Erreurs courantes
- Traiter une bande isolée comme preuve d＇un matériau sans vérifier au moins un ou deux pics de support.
- Ignorer le chevauchement : plusieurs groupes fonctionnels peuvent contribuer près du même nombre d＇onde.
- Sauter la validation lorsque des additifs, des mélanges, l＇oxydation ou la contamination peuvent déformer le spectre.
Conseil de vérification
Lorsque l＇ambiguïté persiste, validez l＇hypothèse avec DSC, GC-MS ou TGA, en particulier pour les mélanges, les échantillons dégradés et les polymères chargés.
Bibliographie derrière ces attributions
-
Alkene (C=C) confiance 1,0
“[30] identified from FT-Raman spectra of olive pomace that the major bands of Figure 2 presents the spectra obtained when concentrations of FAME were evaluated by virgin olive oil were seen at 1267 cm-1 (=C-H), deformation in unconjugated c”
Monitoring Enzymatic Hydroesterification of Low-Cost Feedstocks by Fourier Transform InfraRed Spectroscopy DOI: 10.3390/catal9060535 -
Alkyl C-H confiance 1,0
“The vibration band at 1267 cm-1, 267 displayed by AgvCca 90 corresponds to vibrations of C-H and C-O bonds (Bureau et al., 2019;”
Vazquez-Vuelvas 等 - 2020 - A comparative FTIR study for supplemented agavin a DOI: 10.1016/j.foodhyd.2020.105642 -
Acetate confiance 1,0
“Strong stretching C-O vibrations are observed at 1267, 1032cm-1.”
HPTLC and FTIR Fingerprinting of Olive Leaves Extracts and ATR-FTIR Characterisation of Major Flavonoids and Polyphenolics DOI: 10.3390/molecules26226892 -
Alkyl C-H confiance 1,0
“due to the presence of CH symmetric stretching 3 cm-1 whereas the peaks at about 1267 and 749 may 3.1.2.”
Ahmed 等 - 2013 - Quantitative determination of tolfenamic acid and DOI: 10.2478/s11532-013-0284-6 -
Ester confiance 1,0
“cm-1 cm-1 the principal bands at 2854 to phenyl groups, the bands at 1267 and 2924 correscorresponds to cm-1 pond to the symmetric and anti-symmetric stretching in ester carbonyl groups, and the band at 1060 correthe CH sponds to primary OH”
Aisha 等 - 2014 - Preparation and characterization of nano liposomes DOI: 10.1155/2011/103039. -
Alkyl C-H confiance 1,0
“The bands at 1267 cm-1 and 749 cm-1 are attributed to C-H and C-N deformation, respectively [45].”
Regularities of Encapsulation of Tolfenamic Acid and Some Other Non-Steroidal Anti-Inflammatory Drugs in Metal-Organic Framework Based on -Cyclodextrin DOI: 10.3390/pharmaceutics15010071 -
Alkyl C-H confiance 1,0
“Indian Journal of Pharmaceutical Education and Research | Vol 54 | Issue 3 [Suppl] | Jul-Sep, 2020 Dubey and Dewangan.: Transdermal Patch of Irbesartan for Hypertension cm-1 delivery system of Irbesartan for enhancement of 1375 for C-H Asym”
Dubey 和 Dewangan - 2020 - Rational Design and Characterization of Transderma DOI: 10.5530/ijper.54.3s.145 -
Acetate confiance 1,0
“cm-1, spectrum at 950 and 855 band with the maximum at 1267 which was the result of coupling between the valence vibration of C-O 365 S.S.”
Ilic-Stojanovic 等 - 2015 - The improved photostability of naproxen in the inc DOI: 10.2298/HEMIND131128050I
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