What absorbs at 944 cm⁻¹ in an FTIR spectrum?
A band near 944 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 7 cited sources
Réponse rapide
A band near 944 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 3 | 1,0 |
| Methoxy (OCH3) | 4 | 3 | 1,0 |
| Methacrylate | 4 | 3 | 1,0 |
| Acetate | 4 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Ring structure | 2 | 1 | 1,0 |
| Hydroxyl (O-H) | 2 | 1 | 1,0 |
| Chlorine | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
| Methyl | 1 | 0 | 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 |
|---|---|---|---|
| chitosan | 944, 1650, 1655 | Alkyl C-H, Acetate, Methacrylate | 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 944 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
-
Acetate confiance 1,0
“The cm-1 peak at 944 observed in the as-burnt BCZT powder with pH 5 was related to C-O-H bending vibration which was in agreement with previous work [13].”
Influence of pH values on the surface and properties of BCZT nanopowders synthesized via sol-gel auto-combustion method DOI: 10.1016/j.surfcoat.2016.03.091 -
confiance 1,0
“These peaks 943.88 and 968.32 eV correspond to Cu(II) species at the Cu 2O surface [52].”
Synthesis of CaCO3/Cu2O/GO Nanocomposite Catalysts for Hydrogen Production from NaBH4 Methanolysis DOI: 10.3390/catal13061010 -
Carbohydrate confiance 1,0
“Finally, absorptions at 944 and 841 were assigned to the pyranose ring.”
Gabriela Chuc-Gamboa 等 - 2021 - Antibacterial Behavior of Chitosan-Sodium Hyaluron DOI: 10.3390/app1103 -
confiance 1,0
“silanol Si-O stretch 944 Si-O-Si symmetric stretch 802 C-H3Asymmetric stretch 2954, 2955, 2961 C-H3Symmetric stretch”
<32352D382D3032283433322D3433372920C1A4BCF6B1A420C0AFBDBDB1E220C0E5BDBDBED620B9DAC1F8BCBA20B1E8C5C2C7F620C0CCC1A4C8C620B1E8BCF6B9CE2E687770> DOI: 10.6110/KJACR.2013.25.8.432 -
Acetate confiance 1,0
“The peaks saw at 944.5, prepared sample is calculated by using Debye-Scherrer's formula, cm(cid:3)1 C-O C-O 1105.6 and 1569.2 are assigned to aliphatic bending, C¼O film.”
Effect of Al2O3 on structural and dielectric properties of PVP-CH3COONa based solid polymer electrolyte films for energy storage devices DOI: 10.1016/j.heliyon.2019.e02727 -
Alkyl C-H confiance 1,0
“There are two strong absorption Figure 4c represents the IR spectrum of cationic sago starch at the optimum condition with DS bands at 944 cm-1 and 1081 cm-1 corresponded to an alkyl halide, C-Cl and C-O stretching, 1.195.”
Preparation and Optimization of Water-Soluble Cationic Sago Starch with a High Degree of Substitution Using Response Surface Methodology DOI: 10.3390/polym12112614 -
Alkyl C-H confiance 1,0
“cm-1-C-O and C-C stretching vibration, 1103-1020 cm-1--CH2 bending vibration, 944For the irradiated samples at 120 min, 180 min, and 240 min, two bands appear at 804 cm-1--CH bending vibration (phenyl), and 779-745 cm-1-C-O-C bending vibrac”
Optical Characterization of Ciprofloxacin Photolytic Degradation by UV-Pulsed Laser Radiation DOI: 10.3390/molecules26082324
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