What absorbs at 834 cm⁻¹ in an FTIR spectrum?
A band near 834 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 834 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.
Possible functional-group assignments
| Functional group | Supporting facts | Cited sources | Top confidence |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Chlorine | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Imide | 1 | 1 | 1.0 |
| Acetyl | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Lipid | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 0.9 |
| Metal oxygen | 1 | 0 | 0.9 |
| Oxygen heterocycle | 1 | 0 | 0.9 |
Ranking reflects accumulated literature evidence, not a single authoritative rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| PVC | 834, 1195, 1100 | Alkyl C-H | 3 |
| PMMA | 834, 1722, 1383 | Alkyl C-H | 1 |
| silica | 834, 1100, 1080 | Silicon-oxygen (Si-O), Silicon (Si), Alkyl C-H | 1 |
| SiO2 | 834, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Silicon (Si) | 1 |
| silver nanoparticles | 834, 1636, 1631 | 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 834 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.
Literature behind these assignments
-
Silicon (Si) confidence 1.0
“While, absorption at 834 shows the Si-O-Si asymmetric of silanol (Si-OH) at 966 cm-1 there were absorption stretching [24].”
Ismail 等 - 2015 - Effect of Radiation on Properties of ENRPVCSiO2 DOI: 10.1063/1.4931308 -
C c single bond confidence 1.0
“Besides, the bands between 600 cm-1 and 700 cm-1, 834 cm-1 could be attributed cm-1 ascribed to the C-C stretching and -CH wagging, respectively.”
Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256 -
confidence 1.0
“For PVC, C H stretching mode can be S.Rameshetal./SpectrochimicaActaPartA66(2007)1237-1242 1239 Table2 VibrationalmodesandwavenumbersexhibitedbyPMMA Wavenumbers(cm-1) Descriptionofvibrations References C Hstretching 2927-2986 [30,32] C Ostr”
Ramesh 等 - 2007 - FTIR studies of PVCPMMA blend based polymer elect DOI: 10.1016/j.saa.2006.06.012 -
confidence 1.0
“The pronounced in the Synth1 sample, where the three bands are cm-1 strong and sharp peaks at 834 and 705 are assigned to the not anymore identifiable and a unique broad band is observed, n2 n4 out-of-plane OCO bending mode and to the antis”
Investigation of the hydrozincite structure by infrared and solid-state NMR spectroscopy DOI: 10.2138/am.2013.4158 -
Alkyl C-H confidence 1.0
“cm1 cm1 stretching at 671.43 and 892.51 The peaks at 834.50 and 798.47 indicate C-H deformation and ring stretching of trisubstituted benzene.”
Agrawal 等 - 2023 - Biotreatment of azo dye containing textile industr DOI: 10.21203/rs.3.rs-1876766/v2 -
Lipid confidence 1.0
“Medium-weak bands, only detectable in the FTIR spectrum of carnauba wax at 1634, 1607, 1515 and 834 cm-1, are attributed to the skeletal ring breathing modes of aromatic groups [30,47].”
Characterization of Waxes in the Roman Wall Paintings of the Herculaneum Site (Italy) DOI: 10.3390/app122111264 -
confidence 1.0
“The cm(cid:1)1 N-H peak at 834 is due to the out-of-plane bending”
Facile simultaneous synthesis of tetraaniline nanostructures/silver nanoparticles as heterogeneous catalyst for the efficient catalytic reduction of 4-nitrophenol to 4-aminophenol DOI: 10.1039/d0ra03327h -
confidence 1.0
“It was 1089.6cm-1 (S=O stretching vibration) and 1136.8, and also observed that some peaks shown by pure etoricoxib 639.22009cm-1 (C-Cl stretching vibra834.0, 777.1, and were absent, and the intensity of peaks of these etoricoxib tion).”
Das 等 - 2011 - Solubility and dissolution enhancement of etoricox DOI: 10.5402/2011/819765
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