What absorbs at 805 cm⁻¹ in an FTIR spectrum?
Una banda cerca de 805 cm⁻¹ puede apuntar a varios grupos funcionales. A continuación se muestran las asignaciones más probables, clasificadas por cuánta evidencia publicada respalda cada una — cada una trazable a literatura (DOI) y validada de forma cruzada con nuestros más de 130,000 espectros de referencia y grafo de conocimiento.
Backed by 8 cited sources
Quick answer
A band near 805 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.
Posibles asignaciones de grupos funcionales
| Grupo funcional | Hechos de respaldo | Fuentes citadas | Confianza máxima |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 6 | 6 | 1,0 |
| Silicon (Si) | 3 | 3 | 1,0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1,0 |
| Alkyl C-H | 2 | 2 | 1,0 |
| Sulfate (SO4) | 2 | 2 | 1,0 |
| Hydroxyl (O-H) | 2 | 2 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Metal oxygen | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| C-O single bond | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
| Boron nitrogen | 1 | 0 | 0,9 |
La clasificación refleja la evidencia acumulada de la literatura, no una única regla autorizada. Siempre confirme según el contexto de su muestra.
Possible materials
| Material | Supporting peaks | Overlapping groups | Fuentes citadas |
|---|---|---|---|
| SiC | 805, 791, 1136 | Silicon-oxygen (Si-O), Silicon (Si), Siloxane (Si-O-Si) | 1 |
| asphalt | 805, 1600, 1376 | Alkyl C-H | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 805 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
Literatura detrás de estas asignaciones
-
confianza 1,0
“In addition, the bands at 805.22 are occupied by the phosphate group of the binding cm(cid:0) 1 Si-O and the strong stretching silicon group of the binding.”
Biologically-induced synthetic manganese carbonate precipitate (BISMCP) for potential applications in heavy metal removal DOI: 10.1016/j.heliyon.2023.e15919 -
Sulfate (SO4) confianza 1,0
“LLM confirmed rule peak-group candidate”
Fauzi 等 - 2020 - Characterization, Disintegration, and Dissolution DOI: 10.1155/2020/3565931 -
Hydroxyl (O-H) confianza 1,0
“CR occurs at the peak of 1261 1094 1031 804.7 and 667 cm-1, cm-1 cm-1 The absorption peaks at 1261 1094 and 1031 are identified as the bending vibrations of O-H, stretching vibrations of C-O and stretching vibrations of 804.7cm-1 S=O, respe”
Liang 等 - 2017 - Thermo-stability and aging performance of modified DOI: 10.1016/j.matdes.2017.04.060 -
Metal oxygen confianza 1,0
“The cm-1 intense transmittance band at 805 is due to vibrating Figure 6 displays the UV-visible spectra of YVO4:5%Dy, modes of stretching frequency of V-O bonds in YVO Eu (1 mol%, 3 mol%, 5 mol% and 7 mol%) nanophosphor.”
Synthesis and luminescence properties of europium-codoped and dysorium-doped YVO4 nanophosphor for potential applications DOI: 10.1007/s00339-019-2990-1 -
confianza 1,0
“1.0 corresponded to the asymmetric vibration of the siloxane ml/min) to pH = 9 with 150 ml of 3.0 mol/L HNO containcm-1 bond Si-O-Si, and the band at 805 was assigned to the 3”
Adam 等 - 2012 - Liquid Phase Oxidation of Acetophenone over Rice H DOI: 10.1016/S1872-2067(11)60361-6 -
confianza 1,0
“(cid:2)460, vibration patterns of KIT-6 centered at 805, 970, and crystalline emulsion with the crystallization time of 24 h cm(cid:4)1.29 cm(cid:4)1 1080 The adsorption band around 460 represents could be easily assembled using a mesoporou”
Synthesis of ZSM-5/KIT-6 with a tunable pore structure and its catalytic application in the hydrodesulfurization of dibenzothiophene and diesel oil DOI: 10.1039/c8ra05675g -
Silicon carbon confianza 1,0
“5a, top plot) show a distinct (possibly crystalline) cm-1, which corresponds to the transverse optical vibrational mode of SiC, along with a shoulder where peak at 805 cm-1, which corresponds to the lateral optical vibrational mode of SiC [”
Henry 等 - 2018 - Characterization of Ceramic Matrix Composite Degra DOI: 10.1063/1.5031613 -
Hydroxyl (O-H) confianza 1,0
“It also shows reduced absorbance in the 805 and OH deformation vibrations and CO stretching vibrations (phecm-1 gion, which is associated with the sulfate group of the 3,6-anhynols) can be found.”
A novel biodegradable film based on κ‐carrageenan activated with olive leaves extract DOI: 10.1002/fsn3.1554
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