What absorbs at 469 cm⁻¹ in an FTIR spectrum?
A band near 469 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 469 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 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 4 | 4 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Phosphate (PO4) | 2 | 1 | 1,0 |
| Alkyl C-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 |
| Alkene (C=C) | 1 | 1 | 1,0 |
| N 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.
Matériaux possibles
| Matériel | Pics de support | Groupes chevauchants | Sources citées |
|---|---|---|---|
| hematite | 469, 1030, 938 | Silicon-oxygen (Si-O), Siloxane (Si-O-Si), Silicon (Si) | 1 |
| kaolinite | 469, 3696, 693 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 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 469 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
“by cm-1 Si-O symmetrical stretching vibration to 801 value of wavenumber and Si-O cm-1 wavenumber.37 asymmetrical bending vibration to 469 value of At relative cm-1 high doses of radiation at 687 value of wavenumber, a new peak appears and”
Huseynov 等 - 2018 - Fourier transform infrared spectroscopic study of DOI: 10.1142/S0217979218500741 -
confiance 1,0
“The peaks around 469 and 3098cm(cid:2)1 are attributed to the N LVM [13], and the As stretch mode of N-H [10], respectively.”
Nishimura 等 - 2007 - Electrical properties of GaAsN film grown by chemi DOI: 10.1016/j.physb.2007.08.183 -
Alkene (C=C) confiance 1,0
“LLM confirmed rule peak-group candidate”
Patoka 等 - 2016 - Nanoscale plasmonic phenomena in CVD-grown MoS2 mo DOI: 10.1364/OE.24.001154 -
confiance 1,0
“Peaks found at 446, 452, between 400 and 4,000 O-H 3,691 3,708 3,720 stretching vibrations 469cm-1 highfor three samples can be related to the high-frequency frequency Au mode of CuO;”
Saleem 等 - 2022 - Enhancement in structural, morphological, and opti DOI: 10.1515/ntrev-2022-0473 -
Silicon (Si) confiance 1,0
“cm-1 cm-1 and 469 were attributed to the antisymmetric stretching vibration, symmetric stretching 469 were attributed to the antisymmetric stretching vibration, symmetric stretching vibration cm-1 cm-1 and 469 were attributed to the antisym”
Ding 等 - 2018 - The Preparation of Nano-SiO2Dialdehyde Cellulose DOI: 10.3390/polym10050550 -
Phosphate (PO4) confiance 1,0
“A low cm-1 cm-1 and the double bands at 564 and 604 belong to bending vibrations of P-O (υ intensity band at 469”
Esfahani 等 - 2016 - Structural and morphological analysis of zinc inco DOI: 10.1590/S1517-707620160003.0055 -
confiance 1,0
“(Si-O-Al stretching vibration), 938 and 912 (Al-OH deformation vibration), 693 (Si-O-Si stretching vibration), 1008 cm-1 (Si-O-Al stretching vibration), 938 and 912 cm-1 (Al-OH deformation cm-1 cm-1 symmetrical bending vibration), 538 (Si-O”
Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803 -
Silicon (Si) confiance 1,0
“The characterisitc band at 469 is attributed to the TO (T Si or Al) tetra4 structure35.”
Zeolite RHO Synthesis Accelerated by Ultrasonic Irradiation Treatment DOI: 10.1038/s41598-019-51460-x
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