What absorbs at 478 cm⁻¹ in an FTIR spectrum?
A band near 478 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 478 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 |
|---|---|---|---|
| Metal oxygen | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Metal oxo | 2 | 2 | 0,8 |
| Alkyl C-H | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 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 |
|---|---|---|---|
| calcium carbonate | 478, 3232, 2954 | Alkyl C-H, Silicon-oxygen (Si-O) | 1 |
| SiO2 | 478, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Metal oxygen | 1 |
| hematite | 478, 1030, 469 | Silicon-oxygen (Si-O), Metal oxygen | 1 |
| goethite | 478, 1470, 696 | Metal oxygen, Silicon-oxygen (Si-O) | 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 478 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
“Energy dispersive X-ray structures of hematite moved the peak ranges from 478 (EDX) analyses showed a lot of potassium (0.384-4.057%) cm-1 cm-1 to 456 and 574 to 530 (Kosmas et al.”
An integrated toolkit using multiple methods for determining the potential sources of iron and manganese in groundwater: a case study from the lower Kelantan River Basin, Malaysia DOI: 10.1007/s12665-021-09756-7 -
confiance 1,0
“The FTIR spectrum of the mulation with a size that matched the optical microscopy PVA-UHMWPEO/Ag@SiO nanocomposite exhibited several images, where the size of Ag cores was calculated to be 2 cm-1 new absorption peaks, such as 478 of (Si-O)”
Al-Bermany 等 - 2023 - Effect of green synthesis bimetallic Ag@SiO2 core- DOI: 10.1007/s12633-023-02332-7 -
confiance 1,0
“The high-frequency mode at 579 and the peak at 478 can be attributed to cm-1, the Cu-O stretching vibration.”
Structural and UV-blocking properties of carboxymethyl cellulose sodium/CuO nanocomposite films DOI: 10.1038/s41598-023-28032-1 -
Silicon-oxygen (Si-O) confiance 1,0
“In BB5, in addition to the characteristic features of haematite (Fe 2O 3) at 568 and 478 cm-1, the vibrational absorption of quartz (SiO 2), usually occuring in red ochre mixed with haematite, at 797, 781, and 693 cm-1 [49,50], was also App”
The 20th Century Wall Paintings in the Chapel of the Fallen in Parma Cathedral (Italy): Scientific Investigations for a Correct Conservation Project DOI: 10.3390/app13127235 -
Alkyl C-H confiance 1,0
“Small cm-1 bands between 478 and 648 are related to C-H vibration [31].”
Impedance, Electrical Equivalent Circuit (EEC) Modeling, Structural (FTIR and XRD), Dielectric, and Electric Modulus Study of MC-Based Ion-Conducting Solid Polymer Electrolytes DOI: 10.3390/ma15010170 -
Metal oxygen confiance 0,9
“Assigned to Fe-O.”
Hydrothermal synthesis and characterization of amp#x003B1;-Fe2O3 nanoparticles DOI: 10.1016/j.mssp.2012.12.029 -
Metal oxo confiance 0,8
“V-O-V vibrational stretching bond”
Selvakumar 等 - 2022 - Antibacterial Efficacy of Phytosynthesized Multi-M DOI: 10.1155/2022/6506796 -
confiance 0,7
“Band at 478 cm-1 recognized as octahedral metal stretching”
Kiswanto 等 - 2018 - Effect of Zinc on Crystal Structure and Magnetic P DOI: 10.1088/1757-899X/367/1/012001
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