What absorbs at 808 cm⁻¹ in an FTIR spectrum?
A band near 808 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
Schnelle Antwort
A band near 808 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 7 | 6 | 1,0 |
| Alkyl C-H | 4 | 4 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Metal oxygen | 3 | 3 | 1,0 |
| Amide | 2 | 2 | 1,0 |
| N h | 2 | 2 | 1,0 |
| Aromatic ring | 2 | 2 | 1,0 |
| Nitrogen heterocycle | 2 | 2 | 1,0 |
| Siloxane (Si-O-Si) | 2 | 2 | 1,0 |
| Methacrylate | 2 | 1 | 1,0 |
| Acetate | 2 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Water (H2O) | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 0 | 1,0 |
| C-O single bond | 1 | 0 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Mögliche Materialien
| Material | Unterstützende Peaks | Überlappende Gruppen | Zitierte Quellen |
|---|---|---|---|
| SiO2 | 808, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Silicon (Si) | 1 |
| polypropylene | 808, 1030, 1600 | Alkyl C-H | 1 |
| magnetite | 808, 1740, 1263 | Metal oxygen, Silicon-oxygen (Si-O) | 1 |
| Polyvinyl Alcohol | 808, 1141, 1640 | Alkyl C-H | 1 |
Materialien werden nur angezeigt, wenn derselbe Literaturpool diese Bande und mindestens einen weiteren charakteristischen Peak unterstützt.
Spektrumslogik
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 808 cm⁻¹ is usually not enough for material identification by itself.
Praktische Anwendung
Diese Art von Abfrage ist üblich bei der Polymeridentifikation, dem Screening unbekannter Kunststoffe, der Fehlersuche in der Qualitätskontrolle, der Verifizierung von Recyclingmaterial und der literaturgestützten Überprüfung der Peakzuordnung.
Häufige Fehler
- Behandlung einer isolierten Bande als Beweis für ein Material, ohne mindestens einen oder zwei unterstützende Peaks zu überprüfen.
- Überlappung ignorieren: Mehrere funktionelle Gruppen können nahe der gleichen Wellenzahl beitragen.
- Überspringen der Validierung, wenn Additive, Mischungen, Oxidation oder Verunreinigungen das Spektrum verfälschen können.
Beratung zur Verifizierung
Wenn weiterhin Mehrdeutigkeit besteht, validieren Sie die Hypothese mit DSC, GC-MS oder TGA, insbesondere bei Mischungen, degradierten Proben und gefüllten Polymeren.
Literatur hinter diesen Zuweisungen
-
Silicon (Si) Vertrauen 1,0
“The adsorption cm-1 cm-1 peaks at around 808 and 457 were ascribed to Si-O (symmetric stretching vibration) [41-43].”
Study of Polyvinyl Alcohol-SiO2 Nanoparticles Polymeric Membrane in Wastewater Treatment Containing Zinc Ions DOI: 10.3390/polym13111875 -
Vertrauen 1,0
“Peak at 460 for Si-O-Si bending and at cm-1 808 for stretching of the Si-O-Si.”
Nanostructure and Property of Electrospun SiO2-Cellulose Acetate Nanofiber Composite by Electrospinning DOI: 10.1016/j.egypro.2016.12.133 -
Alkyl C-H Vertrauen 1,0
“In the spectra of non-aged PPc and PPcr, the main cm-1, PP bands were observed at 808 cm-1, due to the angular deformation of the out-of-plane PP bands were observed at 808 due to the angular deformation of the out-of-plane cm-1 cm-1,corres”
From Waste to Potential Reuse: Mixtures of Polypropylene/Recycled Copolymer Polypropylene from Industrial Containers: Seeking Sustainable Materials DOI: 10.3390/su14116509 -
Vertrauen 1,0
“amino bands (NH bending, 808 and 780”
Bellido-Aguilar 等 - 2019 - Effect of a fluoroalkyl-functional curing agent on DOI: 10.1016/j.surfcoat.2019.02.006 -
Water (H2O) Vertrauen 1,0
“H-O-H bending modes of 1590 - 1650 vibration Wagging modes of 808 3 Results and discussion vibration of coordinated water v1 symmetric stretching 930 - 995 3.1 Effect of sludge type PO43vibration of units v2 symmetric bending 404 - 470 Init”
Damalerio 等 - 2019 - Phosphorus recovery from wastewater and sludge DOI: 10.1051/matecconf/201926806016 -
Silicon (Si) Vertrauen 1,0
“3 4000 4 cm-1 The band at 808 could be attributed to the Si-O-Si”
Synthesis of core–shell structured FAU/SBA-15 composite molecular sieves and their performance in catalytic cracking of polystyrene DOI: 10.1080/14686996.2017.1396561 -
Vertrauen 1,0
“Si-O and Be-O bond vibration is observed at wavenumber 808 cm-1.”
Fawzy - 2021 - Separation of fine beryl from quartz via magnetic DOI: 10.37190/ppmp/132329 -
Nitrogen heterocycle Vertrauen 1,0
“The peak at 808 cm-1 is assigned to the breathing mode of the triazine units (Figcm-1 vibrations.”
Underlying Mechanisms of Reductive Amination on Pd-Catalysts: The Unique Role of Hydroxyl Group in Generating Sterically Hindered Amine DOI: 10.3390/ijms23147621
Haben Sie ein Spektrum mit dieser Bande?
Laden Sie Ihr FTIR-Spektrum hoch und erhalten Sie in Sekunden einen vollständigen Interpretationsbericht – Peakzuweisungen mit Literaturzitaten, Bibliotheksübereinstimmungen und einer vertrauensbewerteten Evidenzkette.