What absorbs at 1169 cm⁻¹ in an FTIR spectrum?
A band near 1169 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 1169 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) | 6 | 5 | 1,0 |
| Methacrylate | 6 | 5 | 1,0 |
| C-O single bond | 6 | 5 | 1,0 |
| Acetate | 6 | 5 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| S eq o | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Sulfonyl | 2 | 2 | 1,0 |
| Ester | 2 | 2 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 0,6 |
| Fluorine (C-F) | 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.
Matériaux possibles
| Matériel | Pics de support | Groupes chevauchants | Sources citées |
|---|---|---|---|
| silica | 1169, 1100, 1080 | Methacrylate, Acetate | 1 |
| polystyrene | 1169, 1020, 1600 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| wood | 1169, 1740, 1730 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
Les matériaux sont affichés uniquement lorsque le même ensemble de littérature soutient cette bande et au moins un pic caractéristique supplémentaire.
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 1169 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
-
Carboxyl (COOH) confiance 1,0
“shoulder band at about The 1459 and 1384cm-1 bands are methyl bending signals and bands at 1243 1169cm-1 The different samples of coatings of amphorae were studied are different bending vibrations from COOH.”
Font 等 - 2007 - Fourier transform infrared spectroscopy as a suita DOI: 10.1016/j.aca.2007.07.021 -
Acetate confiance 1,0
“The C-O-H bending vibrations of the CH 2-OH group appeared at 1435 and the cellulose cm1 skeleton vibrations, including the C-O-C bridge stretching, appeared at 1169 (Hinterstoisser et al., 2001).”
Wang 等 - 2022 - Molecular-level characterization of changes in the DOI: 10.21203/rs.3.rs-882939/v1 -
Amide confiance 1,0
“At 50 the absorption intensity at 1169 at 1409 is assigned to the forcm(cid:0) ◦C 1 C-N is 0.98 a.u., but at 150 it is 1.33 a.u.”
Curing mechanism of triglycidylamine crosslinked soybean protein adhesive analyzed by Fourier transform infrared, second derivative infrared and two-dimensional correlation spectroscopy DOI: 10.1016/j.ijadhadh.2021.102825 -
Alkyl C-H confiance 1,0
“cm-1 Bands at 1169 and 1156 arise from a combination of OH and CH bending vibrations [54].”
Direct Quantification of Drug Loading Content in Polymeric Nanoparticles by Infrared Spectroscopy DOI: 10.3390/pharmaceutics12100912 -
Ester confiance 1,0
“Explicitly assigned to ester group vibrations.”
Biowaxes from Palm Oil as Promising Candidates for Cosmetic Matrices and Pharmaceuticals for Human Use DOI: 10.3390/ma16124402 -
confiance 1,0
“11c) measured after curing for 10 months, the Si-O-Si band (1080 cm-1) is remarkably more pronounced, while the faint Si-O-C band (1169 that is detected in 28 days is barely detected in 10 months, suggesting that polymerization has proceede”
Karatasios 等 - 2017 - Modification of water transport properties of poro DOI: 10.1515/pac-2016-1104 -
Aromatic ring confiance 1,0
“Newly cm-1 O=S=O, appearing peaks at 1169, 956, and 2923 are attributed to the benzene ring group and O=S=O -CH stretching vibrations in the PSSNa molecule, the peaks for and benzene ring shift by 2”
Liu 等 - 2019 - Novel Selective Depressant of Titanaugite and Impl DOI: 10.3390/min9110703 -
Amide confiance 1,0
“940 cm-1 and 1169 cm-1 are C-N stretching vibrations of imidazole groups and C=N stretchThe absorption peak at 903 cm-1 originated from the epoxy group of the polymer, which ing vibrations at 1570 cm-1 [22].”
Design and Preparation of Imidazole Ionic Liquid-Based Magnetic Polymers and Its Adsorption on Sunset Yellow Dye DOI: 10.3390/ma15072628
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