What absorbs at 1093 cm⁻¹ in an FTIR spectrum?
A band near 1093 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 1093 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 |
|---|---|---|---|
| Acetate | 12 | 12 | 1.0 |
| Methoxy (OCH3) | 11 | 11 | 1.0 |
| Methacrylate | 11 | 11 | 1.0 |
| C-O single bond | 11 | 11 | 1.0 |
| Phosphate (PO4) | 6 | 6 | 1.0 |
| Silicon (Si) | 4 | 4 | 1.0 |
| Siloxane (Si-O-Si) | 4 | 4 | 1.0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1.0 |
| Phosphorus | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| C c single bond | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| N-O bond | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 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 |
|---|---|---|---|
| TiO2 | 1093, 1700, 1600 | Methacrylate, Acetate, C-O single bond | 2 |
| AgNPs | 1093, 1232, 1048 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| Silver Nanoparticles (AgNPs) | 1093, 1100, 1749 | Methacrylate, Acetate | 1 |
| PVA | 1093, 1660, 2930 | Acetate, Methacrylate, C-O single bond | 1 |
| TiO2 nanoparticles | 1093, 1700, 455 | Methacrylate, C-O single bond, Acetate | 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 1093 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
-
Acetate confidence 1.0
“2970.83 and strong C-O stretch (1092.93 & 1113.28 XRD peaks showed that synthesized TiO nanoparticles 2 have both anatase and rutile phase.”
Biosynthesis of TiO2 nanoparticles by Acalypha indica; photocatalytic degradation of methylene blue DOI: 10.1007/s13204-021-01761-3 -
confidence 1.0
“The internal asymmetric stretching vibration and external symmetric stretching of Si-O-T linkage in ZSM-11 became evident from the absorption bands at around 1093 and cm(cid:2)1, 796 respectively.”
A facile synthesis of ZSM-11 zeolite particles using rice husk ash as silica source DOI: 10.1016/j.matlet.2012.07.079 -
C c single bond confidence 1.0
“cmdeformation vibration are located at around 1438 and 1380 The absorption band at 1093 urn 1, which overlaps with the stretching vibration of C-C, corresponds to the C-N stretching”
Hemeda 等 - 2021 - Synthesis of nanometer-sized PbZrxTi1-xO3 for gamm DOI: 10.1016/j.jpcs.2020.109688 -
N-O bond confidence 1.0
“The originates from the deprotonation of the D1-H215 ligand and cm-1, pH 7.5 and 5.5 showed no peak at 1093 hence this deprotonation is responsible for the pH dependence whereas they cm-1”
Kimura 等 - 2020 - Protonation State of a Key Histidine Ligand in the DOI: 10.1021/acs.biochem.0c00810 -
Hydroxyl (O-H) confidence 1.0
“The variations in the values of OH stretching and bending wave 1093cm(cid:3)1 numbers from sample to sample are usually attributed to varying spectra at arises from asymmetric Si-O-Si stretching strength of hydrogen bending between OH and H”
FT-IR characterization of articulated ceramic bricks with wastes from ceramic industries DOI: 10.1016/j.saa.2014.01.143 -
Acetate confidence 1.0
“groups.13 of the alcoholic Another peak emerged at medium were measured and deducted from the all test cm-1 1093 attributed to C-O-C stretching vibrations of values.12 The Optical Density of the sample was conpolysaccharides.15 Hence, FTIR”
Samantaray 等 - 2021 - Biosynthesized Silver Nanoparticles (AgNPs) from T DOI: 10.5530/ijper.55.3.153 -
Acetate confidence 1.0
“The band at about 1093 is assigned to γ(C-O) stretching vibration of the Advanced Materials Research Vol.”
Sathish 等 - 2013 - Nano Composite PVA-TiO2 Thin Films for OTFTs DOI: 10.4028/www.scientific.net/AMR.678.335 -
Metal oxygen confidence 1.0
“cm-1, stretching vibrations (Si(Al-O)) at 1093 bending vibrations Fig.”
Bohacs 等 - 2017 - CONTROL OF NATURAL ZEOLITE PROPERTIES BY MECHANICA DOI: 10.1515/amm-2017-0216
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.