What absorbs at 1079 cm⁻¹ in an FTIR spectrum?
A band near 1079 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 1079 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 |
|---|---|---|---|
| Methoxy (OCH3) | 7 | 7 | 1.0 |
| Methacrylate | 7 | 7 | 1.0 |
| C-O single bond | 7 | 7 | 1.0 |
| Acetate | 7 | 7 | 1.0 |
| Phosphate (PO4) | 4 | 4 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Amino acid | 2 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 2 | 0 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| Phosphorus | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Phospholipid | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 0.7 |
| Siloxane (Si-O-Si) | 1 | 0 | 1.0 |
| Silicon carbon | 1 | 0 | 1.0 |
| Silanol (Si-OH) | 1 | 0 | 0.9 |
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 |
|---|---|---|---|
| starch | 1079, 1650, 1540 | Methacrylate, Acetate, C-O single bond | 1 |
| Polysaccharide | 1079, 1637, 1320 | Methacrylate, Acetate, C-O single bond | 1 |
| plasma | 1079, 1656, 1650 | Methacrylate, Acetate | 1 |
| collagen | 1079, 1408, 1660 | Methacrylate, Acetate, 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 1079 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
“diffraction peaksemerged.This isbecause the combination tobeasymmetricC-O-Cstretchingvibration.Theabsorption cm-1 ofstrongshearforceandhightemperatureduringextrusion peak at 1079 was the stretching vibration of C-O, C-C 1050-978 cm-1 severe”
Cao 等 - 2020 - Optimization of the preparation process of mung be DOI: 10.1515/ijfe-2020-0025 -
Phospholipid confidence 1.0
“LLM confirmed rule peak-group candidate”
Depciuch 等 - 2022 - EFFECT OF HIGH BLOOD CORTISOL CONCENTRATION ON THE DOI: 10.21203/rs.3.rs-228476/v1 -
Acetate confidence 1.0
“are 1143, 1079, 927, and 862 the internal structure of the grain, given that through miThe bands at 1143 and C-O-C C-OH cm-1 croscopy it was found that the granule maintains its 1079 correspond to and stretching”
Roa Acosta 等 - 2020 - Structural and thermal properties of the amaranth DOI: 10.1515/ijfe-2020-0024 -
S eq o confidence 1.0
“There are three vibrations at 1402, 1330, cm-1 and 1079 due to S=O stretching, the sulfonate group (SO 3) as it is connected to the 10”
Power-Dependent Nonlinear Optical Behaviours of Ponceau BS Chromophore at 532 nm via Z-Scan Technique DOI: 10.1016/j.jphotochem.2020.112574 -
Acetate confidence 1.0
“C-O-C sites is assigned to the peak at 1079 since this peak”
Yusuf 等 - 2016 - From crab shell to solar cell a gel polymer elect DOI: 10.1039/C6RA04188D. -
confidence 1.0
“cm-1 The deformation band found at 1079 is attributed to the oxidation of the lateral chains of cm-1 δ(CN), amino acids as well as to methionine, while the band at 1030 can be attributed to which is found in amino acids such as glycine, pro”
The Comparative Study of the State of Conservation of Two Medieval Documents on Parchment from Different Historical Periods DOI: 10.3390/ma13214766 -
Acetate confidence 1.0
“The peak at 1159 cm-1 is produced by the cm-1 vibration of C-O, while the peaks at 1079 and 1012 belong to the stretching vibration of C-O in stretching vibration of C-O, while the peaks at 1079 and 1012 cm-1 belong to the stretching vibrat”
Flotation and Adsorption of a New Polysaccharide Depressant on Pyrite and Talc in the Presence of a Pre-Adsorbed Xanthate Collector DOI: 10.3390/min7030040 -
Amide confidence 1.0
“In other words, normalized peak at 2959 area of 1079 cm-1, a to the observed decrease in amide I / 1241 these variables were found higher in the vaccinated group, significant decrease was also observed in the band area compared with their a”
CoronaVac (Sinovac) COVID-19 vaccine-induced molecular changes in healthy human serum by infrared spectroscopy coupled with chemometrics DOI: 10.3906/biy-2105-65
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