What absorbs at 837 cm⁻¹ in an FTIR spectrum?
A band near 837 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 837 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 |
|---|---|---|---|
| Alkyl C-H | 8 | 6 | 1.0 |
| Alkene (C=C) | 4 | 4 | 1.0 |
| Methyl | 3 | 2 | 1.0 |
| Methoxy (OCH3) | 3 | 2 | 1.0 |
| Methacrylate | 3 | 2 | 1.0 |
| Acetate | 3 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
Ranking reflects accumulated literature evidence, not a single fixed rule. Always confirm against your sample context.
Possible materials
| Material | Supporting peaks | Overlapping groups | Cited sources |
|---|---|---|---|
| Nanotubes | 837, 1735, 1630 | Alkyl C-H, Methoxy (OCH3), Alkene (C=C) | 1 |
| sodium alginate | 837, 1636, 1080 | Alkyl C-H, Methoxy (OCH3) | 1 |
| SnO2 | 837, 2800, 1547 | Alkyl C-H, Methoxy (OCH3) | 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 837 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
-
Alkyl C-H confidence 1.0
“The methyl and each column contains two level 1, two level 2, two level study, cm-1 peak at 837 corresponds to out-of-plane deformation of 3, two level 4 and two level 5 conditions for the factors assigned to CH C(CH 3) CH CH .”
Optimizing the usability of unwanted latex yield by in situ depolymerization and functionalization DOI: 10.1016/j.indcrop.2015.05.078 -
Alkene (C=C) confidence 1.0
“The hydrocarbon characteristics absorption peaks at 1662 cm-1, 1375 cm-1, and 837 cm-1 relate to the stretching vibrations of C=C bonds, bending cm-1, cm-1, cm-1 1448 1375 and 837 relate to the stretching vibrations of C=C bonds, vibrations”
Potency of Urea-Treated Halloysite Nanotubes for the Simultaneous Boosting of Mechanical Properties and Crystallization of Epoxidized Natural Rubber Composites DOI: 10.3390/polym13183068 -
Alkyl C-H confidence 1.0
“The important absorption peaks indicating stretching vibrations of C=C bonds, bending vibrations of CH2 and CH3 groups, and out of plane deformation of =C-H groups were found at 1662 cm-1, 1448 cm-1 and 1375 cm-1, and 837 cm-1 respectively.”
Selectively Etched Halloysite Nanotubes as Performance Booster of Epoxidized Natural Rubber Composites DOI: 10.3390/polym13203536 -
Alkene (C=C) confidence 1.0
“LLM confirmed rule peak-group candidate”
Preparation and Physiochemical Characterization of Bitter Orange Oil Loaded Sodium Alginate and Casein Based Edible Films DOI: 10.3390/polym14183855 -
Alkyl C-H confidence 1.0
“C-C-C bond is seen at 875 while The CH rocking vibration is observed at 837 The CF bending 2 2”
Facile assembly of flexible quaternary SnO2/SrSnO3/Fe3O4/PVDF nanocomposites with tunable optical, electrical, and magnetic properties for promising magneto-optoelectronic applications DOI: 10.1038/s41598-023-32090-w -
confidence 1.0
“When the unit cell is reduced and bands that were related to C-C-C and C-F at 837 cm-1,”
Ismail 等 - 2023 - The role of nanoparticles inclusion in monitoring DOI: 10.1007/s41779-023-00836-4 -
Alkyl C-H confidence 1.0
“LLM confirmed rule peak-group candidate”
Biodegradation of Navy N5RL1 carpet dye by Staphylococcus saprophyticus strain BHUSS X3 DOI: 10.1007/s13205-015-0276-7 -
Alkene (C=C) confidence 1.0
“As presented in Figure 6, cm-1, spectrums exhibited the characteristic absorption peaks at 1500 and 837 which were attributed to both of the spectrums exhibited the characteristic absorption peaks at 1500 and 837 cm-1, which the C=C stretch”
Preparation of Solution Blown Polyamic Acid Nanofibers and Their Imidization into Polyimide Nanofiber Mats DOI: 10.3390/nano7110395
Have a spectrum with this band?
Upload your FTIR spectrum and get a full interpretation report — peak assignments with literature citations, library matches, and a literature-backed analysis — in seconds.