What absorbs at 1478 cm⁻¹ in an FTIR spectrum?
A band near 1478 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 1478 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 | 8 | 8 | 1,0 |
| Amide | 4 | 4 | 1,0 |
| Secondary amine | 3 | 3 | 1,0 |
| C n single bond | 3 | 3 | 1,0 |
| Aromatic ring | 3 | 3 | 1,0 |
| N h | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Methacrylate | 2 | 2 | 1,0 |
| C-O single bond | 2 | 2 | 1,0 |
| Acetate | 2 | 2 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 0,9 |
| N-O bond | 1 | 0 | 1,0 |
| Nitrate | 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.
Matériaux possibles
| Matériel | Pics de support | Groupes chevauchants | Sources citées |
|---|---|---|---|
| PANI | 1478, 2930, 1300 | Alkyl C-H, Secondary amine, Amide | 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 1478 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
-
Alkyl C-H confiance 1,0
“Vibrational bands at 2935 cm-1 cm-1 and 2880 referred to a C-H stretching, 1478 to the CH bending of an alkyl”
Can 等 - 2023 - Choline Chloride-Based Deep Eutectic Solvent-Treat DOI: 10.3390/f14030569 -
Ester confiance 1,0
“appear at 1,560-1,520 The differential signal at e 1478 cm-1 1,725/1,719 is probably attributed to the 10a-ester”
Takano 等 - 2008 - Herbicide effect on the hydrogen-bonding interacti DOI: 10.1007/s11120-008-9302-5 -
C-O single bond confiance 1,0
“The ficient and variables and cm-1 represent -OH, C-OH and peaks at 1478, 1024 and 803 the interpretation of the experimental results are explained”
Bio-sorption of a bi-solute system of copper and lead ions onto banana peels: characterization and optimization DOI: 10.1007/s40201-021-00632-x -
Alkyl C-H confiance 1,0
“peaks of the C=C skeleton and C-H stretching vibration of CH2 and CH3 induced by arocm-1 However, several distinctive peaks at 1478, 2852, and 2922 were characteristic peaks matic groups of TC [46,47].”
Hanh 等 - 2023 - Adsorption of Tetracycline by Magnetic Mesoporous DOI: 10.3390/su15064727 -
Aromatic ring confiance 1,0
“cm-1 is related to the N=Q=N stretching cated at 1560 vibration in the quinoid structure, and the peak at cm-1 1478 corresponds to the N=B=N vibration of the benzenoid structure.”
He 等 - 2020 - Flexible fabric gas sensors based on PANIWO(3)p-n DOI: 10.1007/s40843-020-1364-4 -
Aromatic ring confiance 1,0
“cm-1 Aromatic C-C stretching Vibration of benzene: 1465-1490 cm-1 The aromatic C-C vibration of benzene shows a peak at 1478.24 with a transmittance of 80.26% (Fig.14) and shows a small shift toward a higher wavenumber with an increasing mo”
Hema 等 - 2022 - Structural and vibrational study of molecular inte DOI: 10.21203/rs.3.rs-649250/v1 -
Aromatic ring confiance 1,0
“The weight loss of 12.7%, between 30 and 350 is (C]C vibrations at about 1478 aromatic stretching) and about attributed to physically adsorbed water and the alkyl thiol Access cm(cid:1)1 (C-H 875 aromatic out-of-plane), due to the presence”
Synthesis and characterization of a new reusable calix[4]arene-bonded silica gel sorbent for antidiabetic drugs DOI: 10.1039/d2ra04530c -
Alkyl C-H confiance 1,0
“This]CHregionisclearlyshowninFigure4(a).Beeswax shellac wax shows an additional well-defined narrow C=O and band (acids/ketones) with the maximum being positioned at shellac wax spectra show two close narrow maxima both of 1735cm-1 CH2 scis”
Invernizzi 等 - 2018 - Mid and Near-Infrared Reflection Spectral Database DOI: 10.1155/2018/7823248
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