What absorbs at 1066 cm⁻¹ in an FTIR spectrum?
A band near 1066 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 1066 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 | 15 | 14 | 1.0 |
| Methoxy (OCH3) | 14 | 13 | 1.0 |
| Methacrylate | 14 | 13 | 1.0 |
| Acetate | 14 | 13 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1.0 |
| Secondary amine | 3 | 3 | 1.0 |
| Amide | 3 | 3 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| C n single bond | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Nucleic acid | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 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 | 1066, 1700, 1093 | Methacrylate, Acetate, 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 1066 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
-
Nitrogen heterocycle confidence 1.0
“This downshift value was the same as cm-1 Metal complexes with histidine ligands have been reported those of the 1111/1102 and 1094 bands observed in Fe2+/Fe3+ cm-1 to exhibit characteristic FTIR signals of the imidazole ring the spectrum o”
Noguchi 等 - 1999 - Structure of a histidine ligand in the photosynthe DOI: 10.1021/bi990631 -
Acetate confidence 1.0
“The medium/wide band at 468 observed at 1066 and 1032 cm-1 were ascribed to C-O-C (in β-glucosidic linkage), C 3-OH, was attributed to the out-of-plane bending mode (C-C-N) [29]).”
Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies DOI: 10.3390/polym14132568 -
Bromine confidence 1.0
“the increase of the volume of the SI-GO dispersion, the initiator vibration is seen at 1066 and 1022 The CBr stretching s-and-conditions) cm-1 becomes inefficient and the possibility of polymer crosslinking vibration of the unreacted initi”
Aliyev 等 - 2020 - SI-ATRP Polymer-Functionalized Graphene Oxide for DOI: 10.1002/admi.202000443. -
Acetate confidence 1.0
“The bending oscillation of the C-H group in the aldehydes was disclosed by the band at 1305 whereas the C-O pulling oscillations of the cm-1, hydes was disclosed by the band at 1305 cm-1, whereas the C-O pulling oscillations of the ether an”
Green Synthesis of TiO2 Nanoparticles Using Acorus calamus Leaf Extract and Evaluating Its Photocatalytic and In Vitro Antimicrobial Activity DOI: 10.3390/catal12020181 -
C-O single bond confidence 1.0
“The hydroxyl band observed for the pure MC can be ascribed to the wavenumber region 3447-3458 cm-1, though the ether band needs to be at 1066”
Synthesis of Polymer Nanocomposites Based on [Methyl Cellulose](1-x):(CuS)x (0.02 M x 0.08 M) with Desired Optical Band Gaps DOI: 10.3390/polym9060194 -
Silicon (Si) confidence 1.0
“700 while the Si crystal is transparent to 1200 in Figure 2B and nicely illustrate the material and number of cm-1, cm-1 cm-1 Bands at 1447 1385 and 1296 are associated active bounces dependent depth of penetration: While the silicon.34 cm-”
Baumgartner 等 - 2020 - 3D Printing for Low-Cost and Versatile Attenuated DOI: 10.1021/acs.analchem.9b04043 -
Alkyl C-H confidence 1.0
“At cm-1 pH 3 the band centred at 1066 which includes the CH vibration, showed a higher intensity 3 compared to that observed at pH 9 where the band shifted and centred with a lower intensity at cm-1 964 (Fig.”
Belhadj 等 - 2016 - Pathways of the photocatalytic reaction of acetate DOI: 10.1016/j.jcat.2016.08.006 -
Acetate confidence 1.0
“A weaker amino characteristic peak at 1255 is associated cm-1 is associated with O-H bending vibration and the peak at 1066 cm-1 is assigned to C-O cm´1 with O-H bending vibration and the peak at 1066 is assigned to C-O stretching.”
Preparation and Characterization of Polyvinyl Alcohol-Chitosan Composite Films Reinforced with Cellulose Nanofiber DOI: 10.3390/ma9080644
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