What absorbs at 1212 cm⁻¹ in an FTIR spectrum?
A band near 1212 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 1212 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 |
|---|---|---|---|
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Amide | 3 | 3 | 1,0 |
| Secondary amine | 2 | 2 | 1,0 |
| C n single bond | 2 | 2 | 1,0 |
| Alkyl C-H | 2 | 1 | 1,0 |
| Fluorine (C-F) | 2 | 1 | 1,0 |
| C c single bond | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Borate | 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 |
|---|---|---|---|
| polypropylene | 1212, 1030, 1600 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| polyaniline | 1212, 1565, 1570 | Methacrylate, Acetate | 1 |
| copolymer | 1212, 2921, 1540 | Methacrylate, Acetate | 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 1212 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
-
Borate confiance 1,0
“B-O bond stretching of tetrahedral BO units 4 ~1050 Stretching vibrations of tetrahedral BO units 4 Stretching vibrations of V=O bonds ~1212, ~1276, ~1387 Asymmetric stretching vibrations of B-O bond of trigonal BO units 3”
Synthesis, thermal and spectroscopic characterization of lithium bismuth borate glasses containing mixed transition metal ions DOI: 10.13036/17533562.57.3.018 -
Alkyl C-H confiance 1,0
“LLM confirmed rule peak-group candidate”
Chen 等 - 2015 - Processing and characterization of electrospun tra DOI: 10.1515/polyeng-2014-0124 -
Amide confiance 1,0
“Some of the referred absorptions can be unambiguously the C-N-C stretching at 1212 cm-1 [27,28].”
An Electrochemical Study on the Copolymer Formed from Piperazine and Aniline Monomers DOI: 10.3390/ma11061012 -
confiance 1,0
“Characteristic absorption bands have also been observed for raw EZT related to acteristic absorption bands have also been observed for raw EZT related to O-H stretching cm-1 cm-1, β-lactam O-H stretching vibrations at 3430 and 3265 C=O stre”
Preformulation Studies of Ezetimibe-Simvastatin Solid Dispersions in the Development of Fixed-Dose Combinations DOI: 10.3390/pharmaceutics14050912 -
Acetate confiance 1,0
“Finally, at 1212 3 there is a band of the phosphite group (C-O-P.”
Valoration of the Synthetic Antioxidant Tris-(Diterbutyl-Phenol)-Phosphite (Irgafos P-168) from Industrial Wastewater and Application in Polypropylene Matrices to Minimize Its Thermal Degradation DOI: 10.3390/molecules28073163 -
Amide confiance 1,0
“1212 cm-1 (C-N stretching vibration mode in benzenoid ring system) and 1315 cm-1(C-N stretching vibration of secondary aromatic amine).”
Kamarudin 等 - 2018 - Adsorption of Copper Ion using Acrylic Acid-g-Poly DOI: 10.1088/1755-1315/140/1/012022 -
Acetate confiance 1,0
“Signals at 736 cm-1, 1212 cm-1 and 1047 cm-1 corresponded to 1047 and 900 Signals at 736 1212 and 1047 corresponded to -C=O, -C-C-Oand -C-O groups, respectively, representing the characteristics of CTA -C=O, -C-C-Oand -C-O groups, respectiv”
Membrane Fouling Behavior of Forward Osmosis for FruitJuice Concentration DOI: 10.3390/membranes11080611 -
Acetate confiance 1,0
“The peak at 1212.42 also assigns to the C-O-C symmetric stretching vibration, and cm-1 vibration in (BX)2.”
Study of the Effect of Sodium Sulfide as a Selective Depressor in the Separation of Chalcopyrite and Molybdenite DOI: 10.3390/min7040051
Avez-vous un spectre avec cette bande ?
Téléchargez votre spectre FTIR et obtenez un rapport d＇interprétation complet — attributions de pics avec citations bibliographiques, correspondances de bibliothèque et une chaîne de preuves avec évaluation de la confiance — en quelques secondes.