What absorbs at 933 cm⁻¹ in an FTIR spectrum?
A band near 933 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 933 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 |
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Phosphate (PO4) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Silicon (Si) | 2 | 2 | 1,0 |
| C c single bond | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 1 | 1,0 |
| Methyl | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silanol (Si-OH) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Nucleic acid | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Carbohydrate | 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 |
|---|---|---|---|
| Silica | 933, 1100, 1080 | Alkyl C-H, Methacrylate, Acetate | 1 |
| Polypropylene | 933, 1030, 1600 | Alkyl C-H, 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 933 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
“It is possible that the new peak of 933.03 eV may be due to Cu (I) species, while the energy band of 935.23 eV could be assumed to be due to Cu”
Ibrahim 等 - 2022 - Effect of Ammonium Sulfide on Sulfidization Flotat DOI: 10.3390/min12101193 -
C c single bond confiance 1,0
“At the length of the wavenumber of 933 another peak also appears, appears, indicating the presence of a C-C bond group.”
Glass Powder Additive on Recycled Polypropylene Filaments: A Sustainable Material in 3D Printing DOI: 10.3390/polym14010005 -
C c single bond confiance 1,0
“The films (C-C in melting temperature is higher for drawn at a higher bands at 933 and 947 (CH rocking);”
Vasanthan 和 Manne - 2013 - Strain-Induced Crystallization and Conformational DOI: 10.1021/ie401783y -
Phosphate (PO4) confiance 1,0
“cm-1, assignments of the phosphate related peaks are as follows: P-O stretching at 776 P-O-C cm-1, cm-1, cmsymmetric stretching at 933 P-O-C assymetric stretching at 1050 P=O at 1240 1.”
An appraisal of the thermal decomposition mechanisms of ILs as potential lubricants DOI: 10.1002/ls.1457 -
Carbohydrate confiance 1,0
“cm-1 (1) Band at 933 (assigned to carbohydrates) is specific for Col fungi (Fig.”
Erukhimovitch 等 - 2010 - Direct identification of potato's fungal phyto-pat DOI: 10.3233/SPE-2010-0483 -
Silicon (Si) confiance 1,0
“XPS A strong peak at 932.54 eV by Cu2p 3/2 EDAX The spectrum revealed the presence of elements like C, N, O, Si and Cu.”
Gupta 等 - 2015 - Silica functionalized Cu(II) catalysed selective o DOI: 10.1007/s12039-015-0902-2 -
Acetate confiance 1,0
“cm-1 cm-1 were observed at 1076 (C-O, axial deformation), 933 cm-1 (characteristic of 3, 6-anhydrogalactose) and 889 (attributed to Fourier transform infrared spectroscopy carbon)[16].”
Hu 等 - 2012 - Preparation of Berbamine Loaded Chitosan-agarose M DOI: 10.1590/S0104-14282012005000073 -
Acetate confiance 1,0
“Firstly in HeLa cells, the band at 933 was assigned to the vibrational mode of the C-O-C ring of deoxyribose in Z-form DNA (Banyay et al., 2003;”
Le Roux 等 - 2015 - Fourier Transform Infrared spectroscopy discloses DOI: 10.1016/S0301-4622
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