What absorbs at 3226 cm⁻¹ in an FTIR spectrum?
A band near 3226 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 7 cited sources
Réponse rapide
A band near 3226 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 |
|---|---|---|---|
| N h | 5 | 5 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Secondary amine | 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 | 3226, 1650, 1540 | Hydroxyl (O-H) | 1 |
| TiO2 | 3226, 1700, 1093 | Hydroxyl (O-H) | 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 3226 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
-
confiance 1,0
“cm-1 However, Figure 2(b) shows a peak at 3226 corresponding to N-H of polyaniline as well as 1666”
Burhan 等 - 2020 - Preparation of Cyperus diffusus Vahl cellulose-pol DOI: 10.1088/1757-899X/833/1/012063 -
Hydroxyl (O-H) confiance 1,0
“The peak centered at 3226 coincides with the OH stretching band of choline chloride and thus it is attributed to the hydrogen bonding between the hydroxyl group of choline ions and the chloride ions (Perkins, Painter et al.”
Ternary Natural Deep Eutectic Solvent (NADES) Infused Phthaloyl Starch as Cost Efficient Quasi-Solid Gel Polymer Electrolyte DOI: 10.1016/j.carbpol.2017.03.023 -
confiance 1,0
“molecule has both carbonyl bonds which also another forked absorption band at about 3334.22 and cm-1 can act as a strong hydrogen acceptor as well as (N-H) bond 3226.23 corresponding to the stretching vibration of”
An Intragastric Delivery Device Employing FDM Technology: 3D-Printed Tablet Containing Green Developed Mosapride-Saccharin Co-crystals DOI: 10.1208/s12249-023-02578-9 -
confiance 1,0
“Bands attributed cm-1 to N-H stretching vibration can be observed at 3226, 3247, 3261, and 3234 for P1, P2, P3, and P4 respectively.”
Comparison of Different Methods for Spongin-like Collagen Extraction from Marine Sponges (Chondrilla caribensis and Aplysina fulva): Physicochemical Properties and In Vitro Biological Analysis DOI: 10.3390/membranes11070522 -
N h confiance 1,0
“Also it has been shown a change in the NH stretching absorption of cm-1 ∼3226 amines [13];”
Kacso 等 - 2012 - Structural characterization of ambazone salt with DOI: 10.3233/SPE-2012-0570 -
Hydroxyl (O-H) confiance 1,0
“LLM confirmed rule peak-group candidate”
Mino 等 - 2016 - A surface science approach to TiO2 P25 photocataly DOI: 10.1016/j.apcatb.2016.05.029 -
N h confiance 0,9
“Part of the range 3326–3226.”
Lin 等 - 2017 - SYNTHESIS AND BIOLOGICAL ACTIVITIES OF 3,6-DISUBST DOI: 10.4314/bcse.v31i3.12
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