What absorbs at 3304 cm⁻¹ in an FTIR spectrum?
A band near 3304 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 3304 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) | 7 | 7 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Amine primary | 1 | 1 | 0,9 |
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 |
|---|---|---|---|
| TiO2 | 3304, 1700, 1093 | Hydroxyl (O-H), Carboxyl (COOH) | 1 |
| AgNPs | 3304, 1232, 1048 | N h, Hydroxyl (O-H) | 1 |
| silver nanoparticles | 3304, 1636, 1631 | Hydroxyl (O-H), N h | 1 |
| TiO2 nanoparticles | 3304, 1700, 455 | Hydroxyl (O-H), 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 3304 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
“The O-H stretching frequency is related to the cm-1 stretching frequency is related to the band at 3304 cm-1 which confirms the CA sample as band at 3304 which confirms the CA sample as partially acetylated cellulose [54].”
TiO2 Nanoparticle Filler-Based Mixed-Matrix PES/CA Nanofiltration Membranes for Enhanced Desalination DOI: 10.3390/membranes11060433 -
Hydroxyl (O-H) confiance 1,0
“LLM confirmed rule peak-group candidate”
Chen 等 - 2021 - Synthesis of Novel Arginine-Based Flame Retardant DOI: 10.3390/molecules26123588 -
Hydroxyl (O-H) confiance 1,0
“The FTIR spectrum of the mushroom extract showed cm-1 a medium peak at 3304 corresponding to H-bonded -OH stretch carboxylic acids and -CH stretch alkene;”
Efficacy of mycosynthesised AgNPs from <i>Earliella scabrosa</i> as an <i>in vitro</i> antibacterial and wound healing agent DOI: 10.1049/iet-nbt.2018.5237 -
Hydroxyl (O-H) confiance 1,0
“In GG: cm-1 case of GG, a broad band at 3304 due to the presence of OH stretching was observed, a sharp absorption band located at”
Raghavendra 等 - 2013 - Cellulose-polymer-Ag nanocomposite fibers for anti DOI: 10.1016/j.carbpol.2012.12.035 -
Hydroxyl (O-H) confiance 1,0
“cm-1 The 3304 absorbance band could also be related to OH group vibrations.”
Rahmawati 等 - 2020 - Isolation and Identification of Fungi Inhabiting R DOI: 10.1002/bit.260230921 -
confiance 1,0
“The of ANI with AA and the The prepolymerization solution containing ANI, AA, and interaction of the template with the monomers paved the melamine (MA) showed shifted and new peaks at 3304, 1634, cm-1 film N-H preparation of the melamine-im”
Regasa 等 - 2020 - Development of Molecularly Imprinted Conducting Po DOI: 10.1021/acsomega.9b03747 -
Hydroxyl (O-H) confiance 1,0
“LLM confirmed rule peak-group candidate”
Wang 等 - 2022 - Biosynthesis and Structural Characterization of Le DOI: 10.21203/rs.3.rs-511002/v2 -
confiance 1,0
“Absorbance peaks at 3304 cm-1 represent the stretching vibrations of N-H [24].”
Zhou 等 - 2017 - Regenerable Antibacterial Cotton Fabric by Plasma DOI: 10.3390/coatings7010011
Avez-vous un spectre avec cette bande ?
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