What absorbs at 830 cm⁻¹ in an FTIR spectrum?
A band near 830 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 830 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 | 10 | 10 | 1.0 |
| C c single bond | 6 | 6 | 1.0 |
| C-O single bond | 5 | 5 | 1.0 |
| Aromatic ring | 5 | 4 | 1.0 |
| Lignin | 5 | 4 | 1.0 |
| Methoxy (OCH3) | 4 | 4 | 1.0 |
| Methacrylate | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Silicon-oxygen (Si-O) | 4 | 3 | 1.0 |
| Hydroxyl (O-H) | 4 | 2 | 1.0 |
| Alkene (C=C) | 3 | 3 | 1.0 |
| Oxygen heterocycle | 3 | 3 | 1.0 |
| Chlorine | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Sulfate (SO4) | 2 | 2 | 1.0 |
| Silicon (Si) | 2 | 1 | 1.0 |
| Carbohydrate | 2 | 1 | 1.0 |
| Protein | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon carbon | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Metal oxo | 1 | 1 | 1.0 |
| C#c | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 0.9 |
| Silanol (Si-OH) | 1 | 0 | 1.0 |
| Silicon hydride | 1 | 0 | 1.0 |
| Silicon nitrogen | 1 | 0 | 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 |
|---|---|---|---|
| lignin | 830, 1035, 1510 | Alkyl C-H, C-O single bond, Aromatic ring | 1 |
| GO | 830, 1720, 1182 | C-O single bond, Alkyl C-H | 1 |
| chitosan | 830, 1650, 1655 | Alkyl C-H, C-O single bond | 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 830 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
-
confidence 1.0
“338.52 826.7 106.26 814.6 160.94 Si-O stretching (Q1) vibration 830.5 122.27 824.6 408.78 847.0 233.85 833.9 110.13 835.2”
Theoretical and experimental study of structures and properties of cement paste The nanostructural aspects of C–S–H DOI: 10.1016/j.jpcs.2011.05.001 -
Alkyl C-H confidence 1.0
“The peak around 830 assoAs thesamples from the north side of (denoted with C-H "-N" ciated with bending of syringyl units, also contributed to in the sample name) were irrigated and samples from the eld”
Bryant 等 - 2023 - Variable lignin structure revealed in Populus leav DOI: 10.1039/d3ra03142j -
C c single bond confidence 1.0
“respectively.20-22 cm-1 reference.21,42,43 The 973 band is used as the internal While many of the 5 bands assigned to the crystalline chains disappear upon melting, Raman bands assigned to the cm-1, amorphous chains, such as the C-C stretch”
Hiejima 等 - 2017 - Investigation of the Molecular Mechanisms of Melti DOI: 10.24517/00050382 -
confidence 1.0
“The immobilization of arsenic by cement and lime is The adsorbed As(V) had a characteristic FTIR band at 830 generally attributed to the formation of calcium arsenic cm-1.”
Jing 等 - 2003 - Immobilization mechanisms of arsenate in iron hydr DOI: 10.1021/es021027gCCC -
Oxygen heterocycle confidence 1.0
“Comparing with the spectrum of cm-1 skeletal vibrations of epoxy ring at 830 are another PtBMA 101-b-PGMA 19-b-PSt (Fig.”
Lin 等 - 2015 - Synthesis and characterization of graphene sheets DOI: 10.1007/s10973-015-4968-3 -
Water (H2O) confidence 1.0
“The bands at 830 775 are due to in-plane, and using NaOH, CH3COOH, water and NH4OH.”
Efficient removal of Cr(VI) by polyaniline modified biochar from date (Phoenix dactylifera) seed DOI: 10.1016/j.gsd.2021.100653 -
C c single bond confidence 1.0
“In Figure 1, the peaks at C C V ( - ) 0 e (1) 830cm-1, 1,076-1, q C-H = and 3,371 represent the bending, e”
Ahmad 等 - 2020 - Synthesis and characterization of a novel chitosan DOI: 10.1515/chem-2020-0137 -
Lignin confidence 1.0
“The band at cm-1 830 is assigned to the syringyl structure in lignin.”
Cao 等 - 2021 - Fabrication of Magnetic Lignin-based Adsorbent for DOI: 10.1016/j.apcatb.2017.01.021
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