What absorbs at 1069 cm⁻¹ in an FTIR spectrum?
A band near 1069 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 1069 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 | 9 | 9 | 1.0 |
| Methoxy (OCH3) | 8 | 8 | 1.0 |
| Methacrylate | 8 | 8 | 1.0 |
| Acetate | 8 | 8 | 1.0 |
| Silicon-oxygen (Si-O) | 4 | 4 | 1.0 |
| Siloxane (Si-O-Si) | 3 | 3 | 1.0 |
| Silicon (Si) | 3 | 3 | 1.0 |
| S eq o | 3 | 3 | 1.0 |
| Phosphate (PO4) | 2 | 2 | 1.0 |
| Carbonyl (C=O) | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Thiocarbonyl | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Sulfonyl | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 0.9 |
| C-S single bond | 1 | 1 | 0.8 |
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 |
|---|---|---|---|
| silica | 1069, 1100, 1080 | Methacrylate, Acetate | 1 |
| zinc oxide | 1069, 1627, 1638 | Methacrylate, Acetate, C-O single bond | 1 |
| zinc oxide nanoparticles | 1069, 1744, 1627 | Acetate, Methacrylate, Methoxy (OCH3) | 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 1069 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
-
C c single bond confidence 1.0
“The band at 1069 is due to cm-1 C-C stretching vibration [22, 23].”
Dhayalan 等 - 2021 - Eco friendly synthesis and characterization of zin DOI: 10.1515/nanofab-2020-0104 -
Silicon (Si) confidence 1.0
“The cm-1 intense band at 1069 corresponds to the Si-O-Si symmetric stretching vibration, cm-1 whereas the Si-O-Si anti-symmetric stretching band is observed at 809 [24,25].”
Vibrational spectroscopic study of pure and silica-doped sulfonated poly(ether ether ketone) membranes DOI: 10.1016/j.saa.2014.12.004 -
S eq o confidence 1.0
“assigned the peaks at 1090 and cm-1 1069 to the S=O symmetric stretch and a combination of C-O and C-OH”
Sangfai 等 - 2015 - Preparation and characterization of kappa-carragee DOI: 10.1007/s00289-015-1360-1 -
Phosphate (PO4) confidence 1.0
“While the absorption spectra suggest symmetric 2cm-1 cm-1 cm-1, PO vibration at 1089 and phosphodiester bands at 1069 and 1055 a”
Serec 等 - 2021 - Conformational Transitions of Double-Stranded DNA DOI: 10.3390/app11052360 -
Acetate confidence 1.0
“FTIR spectra of ether group in the range from 1000 to 1200 overlap the overtone from the peak at 889 which is due cm-1 mode.51 to the ring breathing Other peaks at 1067, 1155, 1390 cm-1 cm-1 and 1481 are attributed to the scissoring and wag”
Yusuf 等 - 2016 - From crab shell to solar cell a gel polymer elect DOI: 10.1039/C6RA04188D. -
Carbohydrate confidence 1.0
“Also, the carbohydrate band at 1069 is more”
Organic biopolymers of venus clams: Collagen-related matrix in the bivalve shells with crossed-lamellar ultrastructure DOI: 10.1016/j.bbrep.2021.100939 -
Acetate confidence 1.0
“cm-1, cm-1, C-H stretching at 2819 C-H bending at 1415 and C-O-H stretching was cm-1 observed at 1069 [33].”
Ashfaq 等 - 2022 - Enhancement of the Solubility and Bioavailability DOI: 10.3390/pharmaceutics14030482 -
S eq o confidence 1.0
“The two strong bands cm-1 cm-1 at 1069 and 1350 appeared to be the existence of S=O bending.”
Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517
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.