What absorbs at 866 cm⁻¹ in an FTIR spectrum?
A band near 866 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 866 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.
Attributions possibles de groupes fonctionnels
| Groupe fonctionnel | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| Methoxy (OCH3) | 3 | 3 | 1,0 |
| Methacrylate | 3 | 3 | 1,0 |
| C-O single bond | 3 | 3 | 1,0 |
| Acetate | 3 | 3 | 1,0 |
| Carbonate | 2 | 2 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| N h | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Alkene (C=C) | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 1 | 0,8 |
| Alkyl C-H | 1 | 0 | 1,0 |
| Carboxyl (COOH) | 1 | 0 | 1,0 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
Possible materials
| Matériel | Pics de support | Overlapping groups | Sources citées |
|---|---|---|---|
| starch | 866, 1650, 1540 | 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 866 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.
Bibliographie derrière ces attributions
-
Acetate confiance 1,0
“The 5 mL freshly obtained hepused corresponds to C O C stretching vibrations from gly866”
Shahid 等 - 2013 - Graft polymerization of guar gum with acryl amide DOI: 10.1016/j.ijbiomac.2013.08.018 -
Carbonate confiance 1,0
“The peak at 866 (labeled 3 in Fig, 4I) has been attributed to either Aor B - type carbonate with slightly different orientation, A u”
Carbonate substitution in the mineral component of bone: Discriminating the structural changes, simultaneously imposed by carbonate in A and B sites of apatite DOI: 10.1016/j.jssc.2017.07.025. -
Acetate confiance 1,0
“cm-1: bands: peaks below 800 skeletal vibrations of the fructose and OH bending of water, 2929 C-H stretching of inulin, 1654 cm-1: glutenandinulin,3433cm-1:N-HstretchingofglutenandOHstretching glucose pyranose rings, 866 stretching of C-O-”
Pourfarzad 等 - 2015 - Serish inulin and wheat biopolymers interactions i DOI: 10.1007/s13197-015-1939-4 -
Amide confiance 1,0
“CLH melting peak was depleted in the thermogram for the cm-1, cm-1 cm-1 1086 (C-N stretching), 866 and bending), 1183 drug loaded PLA and PLGA NPs, indicating the presence of cm-1 (N-H wags) for the CLH-PLGA 2 NPs.”
Enhanced efficacy of clindamycin hydrochloride encapsulated in PLA/PLGA based nanoparticle system for oral delivery DOI: 10.1049/iet-nbt.2015.0021 -
Acetate confiance 1,0
“The third experiment, a new culture of the strain was prepared, and cm-1 peak with wavelength is 865.61 related to C-O.”
Shakeri 等 - 2022 - Biosynthesis of Selenium Nanoparticles and Evaluat DOI: 10.1155/2022/4118048 -
Silicon-oxygen (Si-O) confiance 1,0
“Additional cm-1 cm-1 of SiO4, symmetric stretching of ZnO4, asymmetric stretching of ZnO4, and Si-O bond vibration, IR spectra at 866 are attributed to symmetric stretching of SiO 4, and 900, 930 and 977 as”
Phase Transformation, Optical and Emission Performance of Zinc Silicate Glass-Ceramics Phosphor Derived from the ZnO–B2O3–SLS Glass System DOI: 10.3390/app10144940 -
Aromatic ring confiance 1,0
“benzene ring stretching vibration are 866 and 809 Combined with the analysis of the infrared spectrum of L-DMA in Figure 6, it can be inferred that the modification process of L-DMA on asphalt is mainly a physical modification process.”
Bionic Synthesis of Mussel-like Adhesive L-DMA and Its Effects on Asphalt Properties DOI: 10.3390/ma15155351 -
confiance 0,9
“Text: 'two symmetric stretching vibration peaks of the BO anion at 866 and 912cm-1'.”
Zhang 等 - 2008 - Infrared spectra and luminescence properties of (Y DOI: 10.1016/j.jallcom.2007.01.010
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