What absorbs at 2070 cm⁻¹ in an FTIR spectrum?
A band near 2070 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 2070 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 2 | 2 | 1,0 |
| C=n | 1 | 1 | 1,0 |
| Carbon dioxide | 1 | 1 | 1,0 |
| Thiocyanate | 1 | 1 | 0,8 |
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 2070 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
“Lack for 1 h at 323 K) on fresh surface (top spectrum) reveals a of oxidized Pd adsorption sites due to the reducing effect of set of vibrational features at 2070, 1980, 1931, 1504, 1463, CO also enables us to rule out the presence of carbo”
Sulfur Poisoning and Regeneration Behavior of Perovskite-Based NO Oxidation Catalysts DOI: 10.1007/s11244-016-0721-9 -
Adsorbed carbon monoxide confiance 1,0
“The absorption peak observed at 2070 cm-1 is due to 0.05 linearly adsorbed CO on the Pt surface [1].”
Setup, sensitivity and application of thin electrolyte layer ATR-FTIR spectroscopy DOI: 10.1016/j.jelechem.2004.01.028 -
Adsorbed carbon monoxide confiance 1,0
“cm-1), 2300-2400 625-725 carbon monoxide (CO: cm-1), 2000-2200 sulfide carbonyl (COS: double peaks at 2070;”
Kinetic analysis of the thermal decomposition of a carbon fibre-reinforced epoxy resin laminate DOI: 10.1016/j.jaap.2017.07.002 -
Carbon dioxide confiance 1,0
“This result clearly indicates that the three peaks at 2041, 2021, and 2070 cm-1 are not associated with just one molecule of Co2(CO)8.”
Wang Hang 等 - 2013 - In situ FTIR study of low-pressure hydroformylatio DOI: 10.1016/S1872-2067(11)60504-4 -
C=n confiance 1,0
“2070 cm-1 C=N stretch, 3000 cm-1 C-H stretch c.”
Walters 等 - 2005 - Structure of a-C N H prepared from ammonia DOI: 10.1557/JMR.2005.0423 -
confiance 0,9
“Band at 2070-2030 due to CO on Rh”
Structure and reactivity of Au–Rh bimetallic clusters on titanate nanowires, nanotubes and TiO2(110) DOI: 10.1016/j.cattod.2011.06.002 -
Thiocyanate confiance 0,8
“Text: 'shoulder at 2070' and 'SCN-'”
Johnson 等 - 2021 - An ultrafast vibrational study of dynamical hetero DOI: 10.1063/5.0044822
Avez-vous un spectre avec cette bande ?
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