What absorbs at 817 cm⁻¹ in an FTIR spectrum?
A band near 817 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 817 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 |
|---|---|---|---|
| Aromatic ring | 5 | 4 | 1,0 |
| Methoxy (OCH3) | 4 | 4 | 1,0 |
| Methacrylate | 4 | 4 | 1,0 |
| C-O single bond | 4 | 4 | 1,0 |
| Acetate | 4 | 4 | 1,0 |
| Alkyl C-H | 4 | 3 | 1,0 |
| C c single bond | 3 | 2 | 1,0 |
| Alkene (C=C) | 2 | 1 | 1,0 |
| Hydrogen bond | 2 | 1 | 1,0 |
| Phosphorus | 1 | 1 | 1,0 |
| Phosphate (PO4) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Borate | 1 | 1 | 1,0 |
| Lignin | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 1 | 0,9 |
| Sulfur heterocycle | 1 | 0 | 1,0 |
| C-S single bond | 1 | 0 | 1,0 |
| Silicon (Si) | 1 | 0 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 0 | 1,0 |
| Silicon-oxygen (Si-O) | 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 |
|---|---|---|---|
| ZnO | 817, 1400, 3430 | Methacrylate, C-O single bond, Methoxy (OCH3) | 1 |
| Fe2O3 | 817, 1130, 1631 | Methacrylate | 1 |
| lignin | 817, 1035, 1510 | Methacrylate, C-O single bond, Aromatic ring | 1 |
| PE | 817, 1414, 1700 | Methacrylate, Aromatic ring, Methoxy (OCH3) | 1 |
| PP | 817, 1700, 1043 | Methacrylate, Aromatic ring, Methoxy (OCH3) | 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 817 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
-
Aromatic ring confiance 1,0
“Weak peak appears at 817 in BA-Coir/(Py-Acetone) and Coir-BA (Py-Acetone)-C-BPO due to two adjacent aromatic Ccm-1 H bending vibration of lignin component.”
Rout 等 - 2017 - A green approach to produce silver nano particles DOI: 10.1016/j.surfin.2017.03.004 -
Alkyl C-H confiance 1,0
“As regards the broad band close to 568 cm-1, cm-1, cm-1, cm-1, cm-1 1087 2358 1191 1448 817 cm-1 and 3200 were attributed to stretching vibrations of C-H, C O, B-O and O-H bonds, respectively.”
Zhang 等 - 2019 - Synthesis of TiB2 Powders with Hexagonal Morpholog DOI: 10.1166/jnn.2019.16750 -
Acetate confiance 1,0
“some peaks, situated at 817 and 859 were assigned to the cm-1 (xi) C-O bond from cyclohexane [33];”
Bita 等 - 2023 - Diester Chlorogenoborate Complex A New Naturally DOI: 10.3390/inorganics11030112 -
C c single bond confiance 1,0
“881 sidic links, characteristic of polysaccharides structure ring 852 ------ Stretching C-C of ethyl 817”
Flores-Hernandez 等 - 2021 - Synthesis of a Biodegradable Polymer of Poly (Sodi DOI: 10.3390/polym13040504 -
N-O bond confiance 1,0
“structure.18 WS, initially no peaks were detected at 817 however, lignin-50 °C, Figure 6 shows the SEM images of the wt % WS after pyrolysis of WS at 300, 500, 700, and 900 the different foams fabricated at temperatures, for example, Figure”
Gupta 等 - 2020 - On the Design of Novel Biofoams Using Lignin, Whea DOI: 10.1021/acsomega.0c00721 -
C c single bond confiance 1,0
“The band of 817.23 was known as the stretching mode of C-C.”
Harati 等 - 2022 - Enhanced photocatalytic activity of Fe2O3@ZnO deco DOI: 10.1007/s40201-021-00758-y -
Acetate confiance 1,0
“the spectra of the silicon substrate, while that for PMMA on the klarite surface was seen at cm-1 cm-1 cm-1 622 due to C-C-O stretching, 817 (C-O-C symmetric stretching), 1000 E P”
Kundu 等 - 2021 - Identification and removal of microand nano-plas DOI: 10.1016/j.cej.2021.129816. -
Alkyl C-H confiance 1,0
“the 809-, 817-, 809-, 820-cm-1 , 809-, 817-, and 820-cm-1 peaks are δCH (out-of-plane deformation) of the triazine compound;”
Li 等 - 2019 - Blends of Cyanate Ester and Phthalonitrile-Polyhed DOI: 10.3390/polym11010054
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