What absorbs at 3462 cm⁻¹ in an FTIR spectrum?
A band near 3462 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 3462 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) | 5 | 5 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| N 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 |
|---|---|---|---|
| chitosan | 3462, 1650, 1655 | Amide, Hydroxyl (O-H) | 2 |
| PVP | 3462, 2983, 1648 | Hydroxyl (O-H), Amide, Carbonyl (C=O) | 1 |
| Fe3O4 | 3462, 2358, 1673 | Hydroxyl (O-H), Amide | 1 |
| pectin | 3462, 1746, 1150 | Hydroxyl (O-H), Amide, Carbonyl (C=O) | 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 3462 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
“WavenumAssignment (cm-1) ber 3451 Stretching (O-H) 3462 Stretching (O-H) 2) 2945 Asymmetric stretching (CH 2) 2943 Asymmetric stretching (CH”
Experimental and DFT studies on the structural and optical properties of chitosan/polyvinyl pyrrolidone/ZnS nanocomposites DOI: 10.1007/s00289-023-04700-0 -
Hydroxyl (O-H) confiance 1,0
“cm-1, For the spectrum of free eugenol, a characteristic band is observed around 3462 referring to the O-H cm-1 bond in 2838 the absorption peak corresponds to the stretching of the C-H bond.”
Bruckmann 等 - 2022 - Synthesis, Characterization, and Biological Activi DOI: 10.21203/rs.3.rs-1025029/v1 -
Hydroxyl (O-H) confiance 1,0
“The NH2 amino groups had a characteristic peak near enzymolysis should be operated at a chitosan concentration below 10.5 g/L, which is close to the 3462 cm-1, which was overlapping by the peak due to the -OH group [23].”
Optimization and Characterization of Chitosan Enzymolysis by Pepsin DOI: 10.3390/bioengineering3030017 -
confiance 1,0
“The bands in 3520 and cm-1 3462 correspond to the stretching of N-H;”
Larrosa 等 - 2018 - Spirulina sp biomass drieddisrupted by different DOI: 10.1007/s10068-018-0397-y -
Secondary amine confiance 1,0
“CeH 21.56 53.51 11.39 stretch Alkanes 3462e3472 NeH OeH 9.26 45.52 8.26 stretch, primary, secondary amines, amides, Hebonded stretch, alcohols, phenols 4396 2022;21:4386e4397 journal of materials research and technology”
Loto - 2022 - Analysis of the protection performance of admixed DOI: 10.1016/j.jmrt.2022.11.048 -
Amide confiance 1,0
“The spectra of CS-PEC G shifted to 3462 whereas the peaks attributed to amide I, II as well as to the carbonyl”
Preliminary Evaluation of 3D Printed Chitosan/Pectin Constructs for Biomedical Applications DOI: 10.3390/md19010036 -
Hydroxyl (O-H) confiance 1,0
“The broad band around 3462 cm-1 (spectrum 1) and respectively 3459 (spectrum 2) may be attributed to -OH stretching vibrations of adsorbed water molecules overlapped with -OH stretching vibrations of surface silanols [31-33].”
Muresan 等 - 2014 - Hard porous chromium containing macrospheres as ne DOI: 10.2478/s11532-013-0403-4 -
Hydroxyl (O-H) confiance 0,8
“Peaks attributed to OH incorporation.”
Zhang 等 - 2017 - Mechanisms of Incorporation of Hydroxyl in Coesite DOI: 10.1166/jnn.2017.14519
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.