What absorbs at 451 cm⁻¹ in an FTIR spectrum?
A band near 451 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 451 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 |
|---|---|---|---|
| C c single bond | 2 | 2 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Alkyl C-H | 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 |
|---|---|---|---|
| Fe2O3 | 451, 1130, 1631 | C c single bond | 1 |
| Co3O4 | 451, 1050, 450 | Carboxyl (COOH) | 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 451 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
-
C c single bond confiance 1,0
“It was also noticed that the intensity of Raman bands at 42 cm-1 451.13 and 760.5 correspond to the C-C stretching which become symmetrical with the 43 44 addition salt in the host polymer the interlinking chemical complex has been changed.”
Kumar 和 Rao - 2018 - Structural and electrochemical properties of PVP-C DOI: 10.1088/2053-1591/aace40 -
Metal oxygen confiance 1,0
“cm-1 cm-1 Similarly, Ce-O stretching band at 451 and at 450”
Maqbool 等 - 2016 - Antimicrobial potential of green synthesized CeO2 DOI: 10.2147/IJN.S113508 -
C c single bond confiance 1,0
“Moreover, different mode of a primary aromatic amine or a C-C stretching 451”
Benyoucef 等 - 2005 - Synthesis and in situ MRS characterization of cond DOI: 10.1016/j.eurpolymj.2004.10.047 -
Hydroxyl (O-H) confiance 1,0
“Fritsch et al.: OH stretching vibrations in serpentines 451 Table 1.”
Fritsch 等 - 2021 - Structural, textural, and chemical controls on the DOI: 10.5194/ejm-33-447-2021 -
Carboxyl (COOH) confiance 1,0
“4 cm-1 literature.45 in the reported The band at 180 (F 2g) exhibits CoO vibration, and the other bands at 450.9, 494.7, 6 cm-1correspond 591, and 652 to E g, 2F 2g, and A 1g, which”
Gawai 等 - 2022 - Microwave-Assisted Coprecipitation Synthesis and L DOI: 10.1021/acsomega.1c06179 -
confiance 1,0
“Compared with Sp, the bands at 1051 and 451 cm-1 of Ms attributed to the silica, decreased considerably.”
Cd(II) Adsorption on Different Modified Rice Straws under FTIR Spectroscopy as Influenced by Initial pH, Cd(II) Concentration, and Ionic Strength DOI: 10.3390/ijerph16214129 -
confiance 0,7
“Assigned peak ~451 cm-1 indicates BO.”
Effects of Fe2O3 replacement of ZnO on elastic and structural properties of 80TeO2–(20−x)ZnO–xFe2O3 tellurite glass system DOI: 10.1016/j.jnoncrysol.2012.04.017 -
confiance 0,7
“Assigned to B combination bands.”
Kollipost 等 - 2012 - Communication The highest frequency hydrogen bond DOI: 10.1063/1.4704827
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.