What absorbs at 1136 cm⁻¹ in an FTIR spectrum?
A band near 1136 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 1136 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.
可能性のある官能基アサイン
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Methacrylate | 4 | 4 | 1.0 |
| C-O single bond | 4 | 4 | 1.0 |
| Acetate | 4 | 4 | 1.0 |
| Hydroxyl (O-H) | 3 | 3 | 1.0 |
| Methoxy (OCH3) | 3 | 3 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Alkyl C-H | 2 | 2 | 1.0 |
| Amine primary | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Carbohydrate | 1 | 1 | 1.0 |
| Amino acid | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Metal oxygen | 1 | 1 | 1.0 |
| Silicon carbon | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 0.9 |
| N n bond | 1 | 0 | 1.0 |
ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。
Possible materials
| 素材 | 補助ピーク | Overlapping groups | 引用元 |
|---|---|---|---|
| chitosan | 1136, 1650, 1655 | Acetate, Methacrylate, Hydroxyl (O-H) | 2 |
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 1136 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.
これらのアサインの根拠となる文献
-
信頼度 1.0
“cm(cid:0) 1 Si-O-Si A strong band at 1136 is caused by the presence of”
Ultra-fine beta SiC nanowires Isothermally converted from high activated silica by Carbothermic Reduction and Carburization at low temperature DOI: 10.1016/j.matchemphys.2020.123716 -
信頼度 1.0
“Peaks at 1136 and attributed to intertheprecipitateshape.Itiswellknownthatoxygenprecipitates stitial oxygen appear at 100 and 50K, respectively.”
Ma 等 - 2005 - Infrared studies of the oxygen precipitation in fa DOI: 10.1016/j.mseb.2005.06.005 -
Alkyl C-H 信頼度 1.0
“1136-cm-1 C-H The 1105and bands appeared at similar below the LCST and is assigned to the stretching cm-1) and PVME positions in neat solid (1106, 1134 svibration of the methyl group solvated by water.”
Maeda - 2001 - IR spectroscopic study on the hydration and the ph DOI: 10.1021/la001346q -
Acetate 信頼度 1.0
“The stretching of C-O bond at 1136”
Tuning of ferrites (CoxFe3-xO4) nanoparticles by co-precipitation technique DOI: 10.1007/s42452-019-0244-7 -
Metal oxygen 信頼度 1.0
“LLM confirmed rule peak-group candidate”
Structural characterization of green synthesized α-Fe2O3 nanoparticles using the leaf extract of Spondias dulcis DOI: 10.1016/j.surfin.2020.100618 -
Hydroxyl (O-H) 信頼度 1.0
“This was consistent with the corresponded to the C-H stretching, while 1648cm-1 1458cm-1 results of the TS and E values as both decreased the bands at and were assigned totheδ(O-H)bendingsofwaterandCH noticeably at the highest starch ratio”
Xu 等 - 2005 - Chitosan-starch composite film preparation and ch DOI: 10.1016/j.indcrop.2004.03.002 -
Acetate 信頼度 1.0
“Co-crystal (C=O stretching), 1136.0 (SO asymmetric stretching), and 1177.5 (symmetric stretching).”
Garbacz 和 Wesolowski - 2018 - DSC, FTIR and Raman Spectroscopy Coupled with Mult DOI: 10.3390/molecules23092136 -
Alkyl C-H 信頼度 1.0
“oscillations of the S=O group were seen at 1327 and 1309 Typical bands were cm-1 noticed at 1136 due to bending vibrations of the aliphatic group (C-O), C-N vibration cm-1,”
Development of Tofacitinib Loaded pH-Responsive Chitosan/Mucin Based Hydrogel Microparticles: In-Vitro Characterization and Toxicological Screening DOI: 10.3390/gels9030187
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