What absorbs at 1154 cm⁻¹ in an FTIR spectrum?
A band near 1154 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 1154 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 | 7 | 7 | 1.0 |
| Methoxy (OCH3) | 6 | 6 | 1.0 |
| Methacrylate | 6 | 6 | 1.0 |
| Acetate | 6 | 6 | 1.0 |
| Aromatic ring | 3 | 3 | 1.0 |
| Secondary amine | 2 | 1 | 1.0 |
| C n single bond | 2 | 1 | 1.0 |
| Amide | 2 | 1 | 1.0 |
| Metal hydroxyl | 2 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Nitro (NO2) | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Chitosan | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 0 | 0.9 |
| Nitrate | 1 | 0 | 0.7 |
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 | 1154, 1650, 1655 | Acetate, Methacrylate, C-O single bond | 1 |
| hydrogel | 1154, 1632, 1062 | Methacrylate, 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 1154 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
“1719 1720 1720 Symmetric stretching of epoxy and ester group 1252, 1068, 850 1253, 1071, 566 1246, 1071, 875 1252, 1071, 890 1249, 1071, 896 Stretching C-O-O of ester group 1154”
Imperiyka 等 - 2014 - Preparation and Characterization of Polymer Electr DOI: 10.1155/2014/638279 -
Acetate confidence 1.0
“cm(cid:0) 1, suggested that or ginger EO, the strong and sharp absorption peak at 1743 the absorption C-- cm(cid:0) cm(cid:0) 1 1 and the absorption peak at 721 were assigned to O stretching vipeak at 1154 C-O bration peak, stretching vibra”
Microencapsulation of ginger-based essential oil (Zingiber cassumunar roxb) with chitosan and oil palm trunk waste fiber prepared by spray-drying method DOI: 10.1016/j.csite.2020.100606 -
Metal oxygen confidence 1.0
“LLM confirmed rule peak-group candidate”
An energy-efficient novel emerald Er3+ doped SrGdAlO4 nanophosphor for PC WLEDs excitable by NUV light DOI: 10.1016/j.ceramint.2019.08.118 -
Chitosan confidence 1.0
“cm-1 C\\O\\C [33] is shifted to of the bridge in chitosan at 1149 Wavelength(cm-1) Assignmentsofbands cm-1 C\\O while skeletal vibration involving the stretching 1154 0wt.% 30wt.% 60wt.% 90wt.% cm-1 [33] is shifted to of anhydroglucose ring”
Bifunctional ionic liquid in conductive biopolymer based on chitosan for electrochemical devices application DOI: 10.1016/j.ssi.2015.05.008 -
Acetate confidence 1.0
“cm-1 1506 (C=C aromatic skeletal stretching vibration), 1453 (C-H deformation), cm-1 cm-1 cm-1 1420 (C-H deformation (aromatic ring)), 1260 (C-O stretching), 1211 (Ccm-1 cm-1 C, C-O and C=O stretching), 1154 (C-O-C vibrations), and 1021 (C-”
Altuntas 等 - 2017 - Biodegradation Properties of Wood-plastic Composit DOI: 10.1002/app.24358 -
S eq o confidence 1.0
“The appearance of characteristic cm-1 tions of sulfanilamide aromatic ring C=C bond, two high intensity, sharp bands at 1313 bands in the spectrum of hydrogel with incorporated sulfanilamide at 1599 and cm-1, and 1154 cm-1, originating from”
Modified Sulfanilamide Release from Intelligent Poly(N-isopropylacrylamide) Hydrogels DOI: 10.3390/pharmaceutics15061749 -
Nitro (NO2) confidence 1.0
“cm-1 of cell survival and integrity on the same sample: 2,3-bis[2The bands at 1154 and 897 are attributed to the glycosidic cm-1 methyloxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide bondings.”
Fernandes 等 - 2011 - Cytocompatibility of Chitosan and Collagen-Chitosa DOI: 10.1590/S0104-14282011005000008 -
Ring structure confidence 1.0
“H,10) 6.57 (d, J=5.10 Hz, 1 H, 7) 6.97 (td, J=7.50, 1.20 Chlorophenyl C-Cl stretch and bends 1221 Hz, 1 H, 15) 7.35 (t, 1 H, 16) 7.47 (d, J=6.30 Hz, 1 H, Pyridine ring stretch 1154 14) 7.58 (d, 1 H, 10) 7.86 (d, 1 H, 17) 9.49 (s, 1 H, 14).”
Housheh 等 - 2015 - GCMS, FTIR and NMR Studies for the Identification DOI: 10.5530/ijper.49.4.1
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