What absorbs at 826 cm⁻¹ in an FTIR spectrum?
A band near 826 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 826 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 |
|---|---|---|---|
| Aromatic ring | 5 | 5 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Chlorine | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Alkene (C=C) | 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 |
| C c single bond | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| N-O bond | 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 |
|---|---|---|---|
| ZnO NPs | 826, 1664, 875 | Alkyl C-H | 1 |
| PVA | 826, 1660, 2930 | Alkyl C-H | 1 |
| polymers | 826, 1726, 1743 | 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 826 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
-
N-O bond confidence 1.0
“New peak cm-1 cm-1 attributed to N-O stretching appeared at 826 and 786 for experimental and computational result respectively after addition of NH 4NO salt, proving the presence of NH 4NO salts in the”
Solid polymer electrolyte production from 2-hydroxyethyl cellulose: Effect of NH4NO3 composition on its structural properties DOI: 10.1016/j.carbpol.2017.02.033 -
Aromatic ring confidence 1.0
“Besides, the pore volThe bands at 637, 718, and 781 cm3/g which confirmed the mesoporous region corresponded to aromatic C-H groups in the extract ume was 0.0826 cm-1 may structure (16.85 nm) of pores.”
Synthesis of photocatalytic zinc oxide nanoflowers using Peltophorum pterocarpum pod extract and their characterization DOI: 10.1007/s13204-021-01919-z -
Aromatic ring confidence 1.0
“The durometer conforms with ISO 868-1986 & stretching) and 826 stretching vibration of aromatic ring).28,31 ISO 7619 international standards for rubber measurements In the case of the Antiabrasion1 additive, the parawith samples of a minimu”
Bhullar 等 - 2021 - Advanced spectroscopy, microscopy, diffraction and DOI: 10.1039/d0py01348j -
Nitro (NO2) confidence 1.0
“Absorbance intensities at 1634, 1634, 1273 1273 and and 826 826 cm-1 cm-1 associated associated with with nitro nitro groups groups and and at at 1730 1730 cm-1 cm-1 originating originating from from 1634, 1273 and 826 cm-1 associated with”
Mock-Ups in Plastic Conservation Research: Processing and Aging of 3D Celluloid Specimens Simulating Historical Objects DOI: 10.3390/polym15040852 -
confidence 1.0
“2stretching), 825.53 (C-Cl stretching), 864.11 Zn+2 cm-1”
Iqtedar 等 - 2020 - Biosynthesis, optimization and characterization of DOI: 10.24275/rmiq/Bio1605 -
Alkyl C-H confidence 1.0
“1,070 in PVA/BC/CTS composite can be attributed to stretching of C=O and bending of OH (amorphous cm-1 cm-1 Aerobic Biodegradation sequence of PVA), 917 shifted to 920 in PVA/ cm-1 BC/CTS to CH rocking, and the peak around 826 to”
Kibedi-Szabo 等 - 2012 - Biodegradation Behavior of Composite Films with Po DOI: 10.1007/s10924-011-0391-4 -
Ring structure confidence 1.0
“In the curve of the EHO, cm-1 peaks at 981 characteristic of the anti-symmetric deformation vibration absorption peaks at 981 cm-1 characteristic of the anti-symmetric deformation vibration absorption cm-1 four-membered peak of the ring in”
Preparation of Bis[(3-ethyl-3-methoxyoxetane)propyl]diphenylsilane and Investigation of Its Cationic UV-Curing Material Properties DOI: 10.3390/polym13152573 -
Aromatic ring confidence 1.0
“The bands at 1602 and 1507 cm-1 and cm-1 826 and 746 are derived from the stretching and out-of-plane deformation vibrations those at 826 and 746 cm-1 are derived from the stretching and out-of-plane deformation of C ArC and C ArH bonds fro”
A Top-Down Approach and Thermal Characterization of Luminescent Hybrid BPA.DA-MMA@Ln2L3 Materials Based on Lanthanide(III) 1H-Pyrazole-3,5-Dicarboxylates DOI: 10.3390/ma15248826
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