What absorbs at 1158 cm⁻¹ in an FTIR spectrum?
A band near 1158 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 1158 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 | 22 | 22 | 1.0 |
| Methoxy (OCH3) | 18 | 18 | 1.0 |
| Methacrylate | 18 | 18 | 1.0 |
| Acetate | 18 | 18 | 1.0 |
| Hydroxyl (O-H) | 7 | 7 | 1.0 |
| Carbohydrate | 6 | 6 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Ring structure | 3 | 3 | 1.0 |
| Aromatic ring | 2 | 2 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Carbonate | 1 | 1 | 1.0 |
| N-O bond | 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 |
|---|---|---|---|
| chitosan | 1158, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 2 |
| cellulose nanocrystals | 1158, 1110, 1640 | Acetate, Methacrylate, C-O single bond | 1 |
| Polyethylene | 1158, 1737, 1720 | Methacrylate, Acetate, Methoxy (OCH3) | 1 |
| lignin | 1158, 1035, 1510 | Methacrylate, Acetate, C-O single bond | 1 |
| wood | 1158, 1740, 1730 | 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 1158 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
-
Alkyl C-H confidence 1.0
“Explicit assignment: '1158 (C-H stretching)'”
Preparation and evaluation of nanocomposites of polyfuran with Al2O3 and montmorillonite clay DOI: 10.1002/pi.1562 -
Hydroxyl (O-H) confidence 1.0
“The distinctive band at cm-1 vibration.[18] 1643 was characteristic of O-H bending The characteristic peaks at 1158,”
Hu 等 - 2021 - Properties and Structure of Modified Taro Starch DOI: 10.1002/star.202000252. -
Acetate confidence 1.0
“cm-1 absorption peak at 1320 The bands formed at 1158 in CS-PEG modified films are the result of stretching vibration (C-O vibration) [34,35].”
Effect of Varying Amount of Polyethylene Glycol (PEG-600) and 3-Aminopropyltriethoxysilane on the Properties of Chitosan based Reverse Osmosis Membranes DOI: 10.3390/ijms22052290 -
Alkyl C-H confidence 1.0
“cm-1 corresponded to the absorption peaks at 1158and 1105 Figure 4 was an IR spectrum of the appointed point on the pyridine ring C H bending vibration in the plane.”
Li 等 - 2012 - Feasibility study of the detection of chlorpyrifos DOI: 10.1117/1.OE.51.10.103204 -
Acetate confidence 1.0
“xylan, 1158 for C-O-C vibration in cellulose been suppressed by a strong absorption at 1230 The cm-1(14)”
Pandey 和 Pitman - 2003 - FTIR studies of the changes in wood chemistry foll DOI: 10.1016/S0964-8305(03)00052-0 -
Acetate confidence 1.0
“cm-1 The absorption peak at 1158 indicates C-O-C stretching of the glycosidic ring [39].”
Rana 等 - 2023 - Morphological, Spectroscopic and Thermal Analysis DOI: 10.3390/polym15061530 -
Acetate confidence 1.0
“Orden.28Also, de la it was observed that in heated films the cm-1 exhibited a relative increase with respect to band at 1650 cm-1 C-O- (antisymmetric stretching of the the band at 1158 C bridge), suggesting the increase of new amide and/or”
Rivero 等 - 2012 - Heat Treatment To Modify the Structural and Physic DOI: 10.1021/jf204077k -
Acetate confidence 1.0
“Value of absorbance A1158 for wavenumber characteristic for C-O-C vibrations in cellulose 1158 h-peak and hemicelluloses, and for A related to C-H deformation vibrations in cellulose;”
FTIR Analysis of Changes in Chipboard Properties after Pretreatment with Pleurotus ostreatus (Jacq.) P. Kumm DOI: 10.3390/en15239101
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