What absorbs at 3667 cm⁻¹ in an FTIR spectrum?
A band near 3667 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 3 cited sources
Réponse rapide
A band near 3667 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) | 2 | 2 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 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 |
|---|---|---|---|
| starch | 3667, 1650, 1540 | Hydroxyl (O-H), Methacrylate | 1 |
| PLA | 3667, 1650, 1073 | Methacrylate, Hydroxyl (O-H) | 1 |
| zeolite | 3667, 1013, 1245 | Hydroxyl (O-H) | 1 |
| PPy | 3667, 1043, 910 | Methacrylate | 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 3667 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
-
Hydroxyl (O-H) confiance 1,0
“Also, the results indicate that the nature of peaks (3667 3101 and 3024 and some new peaks cm(cid:0) 1) O-H PPy/Ze nanocomposite was not altered after RB and RR adsorption (3618 indicate the involvement of functional groups in RB cm(cid:0)”
Polypyrrole/zeolite composite – A nanoadsorbent for reactive dyes removal from synthetic solution DOI: 10.1016/j.chemosphere.2021.132164 -
Hydroxyl (O-H) confiance 1,0
“The cm-1 theoretical FTIR spectra of starch (a) show that bands in the range of 3689-3446 were related to -OH stretching vibrations which directly connected to the rings, while the bands at cm-1 3667 and 3661 were related to -OH stretching”
Akman 等 - 2020 - Synthesis and characterization of starch sulfates DOI: 10.1016/j.carbpol.2012.07.075 -
Acetate confiance 1,0
“Other peaks in printed PLA include: the CH3 stretching vibrations at 2829 and 2932 cm-1 and OH stretching vibrations at 3501 and 3667 cm-1 due to the hygroscopic nature of PLA (although these features can also be attributed to the C=O overt”
Impact of the Fused Deposition (FDM) Printing Process on Polylactic Acid (PLA) Chemistry and Structure DOI: 10.3390/app7060579
Avez-vous un spectre avec cette bande ?
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