What absorbs at 3306 cm⁻¹ in an FTIR spectrum?
A band near 3306 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 3306 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) | 4 | 4 | 1,0 |
| N h | 4 | 4 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| Hydrogen bond | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Carbohydrate | 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 |
|---|---|---|---|
| PVA | 3306, 1660, 2930 | Hydroxyl (O-H), Amide | 1 |
| Starch | 3306, 1650, 1540 | Hydroxyl (O-H), Amide | 1 |
| nanotube | 3306, 1540, 1080 | Amide, N h, Hydroxyl (O-H) | 1 |
| chitosan | 3306, 1650, 1655 | Amide, Hydroxyl (O-H), N h | 1 |
| silver nanoparticles | 3306, 1636, 1631 | Hydroxyl (O-H), Amide, N h | 1 |
| collagen | 3306, 1408, 1660 | Amide, N 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 3306 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
“cm-1 the FTIR (ATR) The broad band at 3306.05 revealed study reported a lower value of crystallinity index From Previous presence of OH group in cellulose [20,21], while the band PALF, which was 13.74% compared to the current study [30].”
Characterization of silane treated Malaysian Yankee Pineapple AC6 leaf fiber (PALF) towards industrial applications DOI: 10.1016/j.jmrt.2020.01.058 -
Hydroxyl (O-H) confiance 1,0
“However, the absorption peaks at 3306 due to stretching of O-H appear in all spectra, where they are belonging to PVA.”
Highly Conductive Polyelectrolyte Membranes Poly(vinyl alcohol)/Poly(2-acrylamido-2-methyl propane sulfonic acid) (PVA/PAMPS) for Fuel Cell Application DOI: 10.3390/polym13162638 -
confiance 1,0
“It exhibits a relatively broad peak at about 3306 cm-1 attributed to the N-H stretching vibrations (with NH involved in”
Evaluation of Water Sorption and Solubility and FTIR Spectroscopy of Thermoplastic Orthodontic Retainer Materials Subjected to Thermoforming and Thermocycling DOI: 10.3390/app13085165 -
Hydroxyl (O-H) confiance 1,0
“TEM 2114, and 1635 The peaks at 3306 and 2114 reveals that the CRE-AgNPs are spherical in shape with a wellcorrespond to the stretching vibration of OH in the alcoholic C�C”
Bakthavatchalam 等 - 2023 - Biogenic Synthesis and Characterization of Silver DOI: 10.1021/acsomega.2c07531 -
confiance 1,0
“Fourier Transform Infrared Spectroscopy (FTIR) Analysis with N-H stretching frequency, occurred at 3304.82 and 3305.90 cm-1 for ASC and PSC, respectively.”
Physicochemical Properties and Biocompatibility Evaluation of Collagen from the Skin of Giant Croaker (Nibea japonica) DOI: 10.3390/md16070222 -
Hydroxyl (O-H) confiance 1,0
“The maximum of hydroxyl band shifts from 3306 cm-1 to 3391 cm-1 in both types of the samples.”
Ziegler-Borowska 等 - 2018 - Photochemical Reactions in Dialdehyde Starch DOI: 10.3390/molecules23123358 -
confiance 0,9
“assigned to -CO-NH-”
Liu 等 - 2013 - Synthesis and Application of a Novel Polyamide Cha DOI: 10.1155/2013/616859 -
N h confiance 0,9
“Explicit assignment: '3305.87 symmetric stretching' and 'N-H'”
Ni -chitosan/carbon nanotube: An efficient biopolymer -inorganic catalyst for selective hydrogenation of acetylene DOI: 10.1016/j.heliyon.2023.e13523
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