What absorbs at 2161 cm⁻¹ in an FTIR spectrum?
A band near 2161 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 5 cited sources
Réponse rapide
A band near 2161 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 |
|---|---|---|---|
| Nitrile | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 1 | 1,0 |
| C#c | 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.
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 2161 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
-
Alkyl C-H confiance 1,0
“The absorption characteristics of chitosan with OH stretching were found at 3002 cm-1, C-H at 2161 cm-1, and C=O at”
Synthesis and Optimization of Superhydrophilic-Superoleophobic Chitosan–Silica/HNT Nanocomposite Coating for Oil–Water Separation Using Response Surface Methodology DOI: 10.3390/nano12203673 -
C#c confiance 1,0
“3276 Strong, broad Alcohol Alkyne C≡C terminal alkyne (monosubstiOH stretch 2161 Weak”
The Antimicrobial Activities of Silver Nanoparticles from Aqueous Extract of Grape Seeds against Pathogenic Bacteria and Fungi DOI: 10.3390/molecules26196081 -
Adsorbed carbon monoxide confiance 1,0
“cm-1) other two bands at higher frequencies (2161 and 2152 required more time for complete The other two bands at higher frequencies (2161 cm-1 and 2152 cm-1) required more time for complete desorption, and for this reason they can be assig”
Atzori 等 - 2020 - Adsorption Properties of Ce-5(BDC)(7.5)(DMF)(4) MO DOI: 10.3390/inorganics8020009 -
Silanol (Si-OH) confiance 1,0
“The cm-1 remaining band at 2161 is related to silanol groups present in large quantity in Mn 2.0SiBEA in line with earlier”
Influence of the nature and environment of manganese in Mn-BEA zeolites on NO conversion in selective catalytic reduction with ammonia DOI: 10.1039/C7CP02096A -
Nitrile confiance 1,0
“ice is warmed, a nitrile band at 2161 AAN is diluted in water ice, a large amount of AAN is driven”
Borget 等 - 2012 - Aminoacetonitrile characterization in astrophysica DOI: 10.1051/0004-6361/201218949
Avez-vous un spectre avec cette bande ?
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