What absorbs at 809 cm⁻¹ in an FTIR spectrum?
A band near 809 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
Quick answer
A band near 809 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.
Iespējamie funkcionālo grupu piešķīrumi
| Funkcionālā grupa | Atbalstošie fakti | Citētie avoti | Augstākā pārliecība |
|---|---|---|---|
| Methacrylate | 4 | 3 | 1,0 |
| Acetate | 4 | 3 | 1,0 |
| Alkyl C-H | 4 | 3 | 1,0 |
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Silicon-oxygen (Si-O) | 2 | 2 | 1,0 |
| Metal oxygen | 2 | 2 | 1,0 |
| Amide | 2 | 1 | 1,0 |
| C-S single bond | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Nitrogen heterocycle | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Carbohydrate | 1 | 1 | 0,8 |
| Ketone | 1 | 0 | 1,0 |
| Ester | 1 | 0 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
| Carbonyl (C=O) | 1 | 0 | 1,0 |
Rangs atspoguļo uzkrātos literatūras pierādījumus, nevis vienu autoritatīvu noteikumu. Vienmēr apstipriniet atbilstoši parauga kontekstam.
Possible materials
| Materiāls | Atbalstošie pīķi | Overlapping groups | Citētie avoti |
|---|---|---|---|
| silica | 809, 1100, 1080 | Alkyl C-H, Methacrylate, Acetate | 1 |
| nanotubes | 809, 1735, 1630 | Alkyl C-H, Methacrylate, Acetate | 1 |
| lignin | 809, 1035, 1510 | Alkyl C-H, Methacrylate, Acetate | 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 809 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.
Literatūra aiz šiem piešķīrumiem
-
Metal oxygen pārliecība 1,0
“and iii)the appearanceof newRaman lines at 809 cm-1, 710 and 809 which are attributed to the W-O vibrational mode in WO [28].”
Single-walled carbon nanotubes functionalized with polydiphenylamine as active materials for applications in the supercapacitors field DOI: 10.1016/j.diamond.2012.12.006 -
Silicon carbon pārliecība 1,0
“Correspond to Si-C bonds.”
Optical and photoelectrochemical properties of nitrogen-doped a-SiC thin films deposited by reactive DOI: 10.1080/2374068X.2021.1890420 -
Metal oxygen pārliecība 1,0
“10 a-b), peaks at 809, 811 and 812 cm-1 mixtures, MNP-PCP shifted to 814 which assigned to As-O [35].”
Enhanced arsenic (iii) adsorption from aqueous solution by magnetic pine cone biomass DOI: 10.1016/j.matchemphys.2018.09.067 -
pārliecība 1,0
“The cm-1 intense band at 1069 corresponds to the Si-O-Si symmetric stretching vibration, cm-1 whereas the Si-O-Si anti-symmetric stretching band is observed at 809 [24,25].”
Vibrational spectroscopic study of pure and silica-doped sulfonated poly(ether ether ketone) membranes DOI: 10.1016/j.saa.2014.12.004 -
Alkyl C-H pārliecība 1,0
“The spectrum of porous graphene nanosheets is represented by the cm-1, cm-1, cm-1 cm-1, peaks at 809 1636 2344 and 3309 resulting from C-H bonding, C=C conjugation, C-N band and N-H extending vibrations.”
An Amperometric Acetylcholine Biosensor Based on Co-Immobilization of Enzyme Nanoparticles onto Nanocomposite DOI: 10.3390/bios13030386 -
Acetate pārliecība 1,0
“[60] assigned the spectral features of pure chlorogenic acid isomer standards as follows: The peak at cm-1 cm-1 809 was attributed to cyclohexane C-O twisting;”
Durazzo 等 - 2018 - Qualitative Analysis of Traditional Italian Dishes DOI: 10.3390/su10114112 -
pārliecība 1,0
“ESI-MS molecular-ion peak 809.21, corresponding to H+ + 1H [Zn(L3) ].”
Gusev 等 - 2020 - Synthesis, Photoluminescence and Electrical Study DOI: 10.3390/ma13245698 -
Acetate pārliecība 1,0
“cm-1) cm-1) 1330-1326 [30], a C-O-C band center position (1025 [31], and C-O-C vibrations lignin, there is a syringyl (S) at 809 cm-1.”
Mesoporous Manganese Oxide/Lignin-Derived Carbon for High Performance of Supercapacitor Electrodes DOI: 10.3390/molecules26237104
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