What absorbs at 1156 cm⁻¹ in an FTIR spectrum?
A band near 1156 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 1156 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 |
|---|---|---|---|
| C-O single bond | 19 | 19 | 1.0 |
| Methoxy (OCH3) | 16 | 16 | 1.0 |
| Methacrylate | 16 | 16 | 1.0 |
| Acetate | 16 | 16 | 1.0 |
| Carbohydrate | 9 | 9 | 1.0 |
| Alkyl C-H | 5 | 5 | 1.0 |
| Hydroxyl (O-H) | 5 | 5 | 1.0 |
| C c single bond | 3 | 3 | 1.0 |
| Ring structure | 2 | 2 | 1.0 |
| Amide | 2 | 2 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Fluorine (C-F) | 1 | 1 | 1.0 |
| Ammonium | 1 | 1 | 1.0 |
| Oxygen heterocycle | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| C-S single bond | 1 | 1 | 1.0 |
| Hydrogen bond | 1 | 1 | 1.0 |
| S eq o | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 0.9 |
| Ester | 1 | 1 | 0.7 |
| Carboxyl (COOH) | 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 |
|---|---|---|---|
| cellulose | 1156, 1735, 1650 | Acetate, Methacrylate, C-O single bond | 1 |
| PPy | 1156, 1043, 910 | Methoxy (OCH3), Methacrylate, 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 1156 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
-
Acetate 信頼度 1.0
“0.14 0.01** Amide II 1542.34±1.54 1545.34±0.46 0.05* COO symmetric stretching 1396.38±2.09 1398.45±1.27 0.01** PO2 asymmetric stretching 1235.51±1.74 1250.20±0.57 0.01** C-O-C symmetric stretching 1156.29±1.22 1150.96±1.48 PO2 symmetric str”
Use of Fourier transform infrared spectroscopy for rapid comparative analysis of Bacillus and Micrococcus isolates DOI: 10.1016/j.foodchem.2008.08.063 -
Amide 信頼度 1.0
“The presence of mode at were also sheep), the band of the amide III at 1156cm(cid:3)1, unclear to the researchers until they were appointed to a confirming the stabilshifted to wave number at amide's 100(cid:1) side chain (resonance of amin”
Hassan - 2019 - Fourier transform infrared spectroscopy to detect DOI: 10.1080/00387010.2019.1623262 -
Water (H2O) 信頼度 1.0
“33O+ in Figure 3 is assigned to the absorption at 2366 similarly the quantity of RSO and H in equilibrium with combination of CF stretching vibrations at 1156 and 1212 that (C 0) of RSO 3H at the stage II when free water just cm-1.12 cm-1 T”
Iwamoto 等 - 2002 - Water in perfluorinated, sulfonic acid Nafion memb DOI: 10.1021/jp013709g -
Carbohydrate 信頼度 1.0
“The characteristic bands of β-glucan are at 1156, 1076, 889cm-1.”
Liu 等 - 2006 - A study of the mushrooms of boletes by Fourier tra DOI: 10.1117/12.667136 -
Carbohydrate 信頼度 1.0
“In the entire 1D-FTIR spectra, sixteen peaks herbs contain considerably quantity of starch which was were chosen as characteristic peaks and summarized in revealed from the characteristic peaks at 1156-”
Lu 等 - 2008 - Differentiation of Asian ginseng, American ginseng DOI: 10.1016/j.molstruc.2007.12.008 -
Acetate 信頼度 1.0
“5, the TSX spectra showed a C-O-C band at 1156 and a cm-1 small broad peak at 1119 assigned to the C-OH as previously described [35].”
Sangfai 等 - 2015 - Preparation and characterization of kappa-carragee DOI: 10.1007/s00289-015-1360-1 -
Silicon (Si) 信頼度 1.0
“The peaks in zeolite (1156 24.0 with 4.35 Å and 3.70 Å d-spacing values were associated with the cm(cid:0) 1) Si-O-Si 1054 could be because of stretching in bonds and charinterplanar spacing of PPy (Janaki et al., 2015;”
Polypyrrole/zeolite composite – A nanoadsorbent for reactive dyes removal from synthetic solution DOI: 10.1016/j.chemosphere.2021.132164 -
S eq o 信頼度 1.0
“These new assignments at 1186 & 1011 cm-1 corresponded to -SO 3Na group while the bands in 1156 & 1149 region are due to S=O stretching 138 vibration.”
Radiation synthesis and characterization of super-absorbing hydrogel from natural polymers and vinyl monomer DOI: 10.1016/j.envpol.2018.07.129
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