What absorbs at 1097 cm⁻¹ in an FTIR spectrum?
A band near 1097 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 1097 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 |
|---|---|---|---|
| C-O single bond | 17 | 17 | 1.0 |
| Methacrylate | 16 | 16 | 1.0 |
| Acetate | 16 | 16 | 1.0 |
| Methoxy (OCH3) | 14 | 14 | 1.0 |
| Silicon-oxygen (Si-O) | 11 | 10 | 1.0 |
| Siloxane (Si-O-Si) | 9 | 8 | 1.0 |
| Silicon (Si) | 7 | 6 | 1.0 |
| Amide | 6 | 6 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| C n single bond | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 2 | 1.0 |
| Ketone | 2 | 2 | 1.0 |
| Ester | 2 | 2 | 1.0 |
| Carboxyl (COOH) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Phosphate (PO4) | 2 | 1 | 0.9 |
| Borate | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Metal hydroxyl | 1 | 1 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Carbon dioxide | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Chlorine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Fatty acid | 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 |
|---|---|---|---|
| Polyurethane | 1097, 2270, 1700 | Methacrylate, Acetate, C-O single bond | 1 |
| PVC | 1097, 834, 1195 | Methoxy (OCH3), Methacrylate, Acetate | 1 |
| oil | 1097, 1161, 1163 | Methoxy (OCH3), Methacrylate, 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 1097 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
“The BSNs spectra had three absorption bands at cm-1 cm-1, 1097 and 1189 which corresponded to the TO Si-O2.6 Acridine Orange/Ethidium Bromide Staining and LO modes of asymmetric stretching vibrations of Si, respectively.”
Fabrication of Biogenic Silica Nanostructures from Sorghum bicolor Leaves for Food Industry Applications DOI: 10.1007/s12633-020-00379-4 -
confidence 1.0
“659.7 CO32(cid:2) u2 Out-of-plane bending vibration of 883.7 Strong u3 929.6 Very strong Si-O asymmetric stretching vibration of silicate SO42 u3 S-O stretching vibration of 1097 Small shoulder 1114.2”
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 -
Acetate confidence 1.0
“at 3291 -OH and -NH groups, 2922-OH stretching, 1745-carboxyl and carbonyl groups of 2 hemicellulose, 1650amide (-C=O) or N-H bending, 1513-aromatic skeletal vibrations, 1457-OH and -C-O stretching, 1232-C-O stretch, 1159-C-O stretching of”
Adsorption Kinetic and Isotherms of Reactive Red 120 on <i>Moringa oleifera</i> Seed as an Eco-Friendly Process DOI: 10.1016/j.molstruc.2019.05.106 -
Amide confidence 1.0
“The sharp peak at 1340 is attributed to the C-H bending in alkanes and the 1097 cm-1 corresponds to the C-N stretching of the amines.”
Krishnan 等 - 2020 - Leaf Extract ofDillenia indicaas a Source of Selen DOI: 10.3390/coatings10070626 -
Chlorine confidence 1.0
“The bands at 1097 cm-1 cm-1 cm-1 cm-1 corresponded to the skeletal vibration (Cl-C-H).”
Understanding Hydrothermal Dechlorination of PVC by Focusing on the Operating Conditions and Hydrochar Characteristics DOI: 10.3390/app7030256 -
Acetate confidence 1.0
“Stretching M 1097 -C-O Stretching M”
Fourier transform midinfrared spectroscopy evaluation of early stages of virgin olive oil autoxidation DOI: 10.1002/ejlt.201200317 -
Amide confidence 1.0
“thick line) exhibited two bands at 1097 and 1103 When the temperature of the solution was lowered to 77 K, the C-N (1060-1140 cm-1) FIGURE 4: stretching region of FTIR equilibrium of the two tautomers changed and the relative (e-h) (a-d) DL”
Noguchi 等 - 1999 - Structure of a histidine ligand in the photosynthe DOI: 10.1021/bi990631 -
Acetate confidence 1.0
“The C-O-C stretching band at 1097 cm-1 did not show any shifting up to the sample with 10 wt.% LiClO4.”
Additive Manufacturing Polyurethane Acrylate via Stereolithography for 3D Structure Polymer Electrolyte Application DOI: 10.3390/gels8090589
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