What absorbs at 2186 cm⁻¹ in an FTIR spectrum?
A band near 2186 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 4 cited sources
Quick answer
A band near 2186 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 |
|---|---|---|---|
| Adsorbed carbon monoxide | 2 | 2 | 1.0 |
| Silicon hydride | 2 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 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。
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 2186 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
-
Silicon hydride 信頼度 1.0
“Then, to determine 2186cm-1 907cm-1 and at the due to SiH asymmetric the concentration in the plasma, three other independent 4 bending [15].”
Fourier-transformed infrared absorption spectroscopy: a tool to characterize the chemical composition of Ar--NH3--SiH4 dielectric barrier discharge DOI: 10.1088/0022-3727/46/46/464007 -
Hydroxyl (O-H) 信頼度 1.0
“on shoulder at 2144 bands at 2150 and 2155 which areslightly up-shifted, can and a small band at 2186 Upon 2013 cm(cid:2)1, be attributed to CO hydrogen-bonded to OH groups of different evacuation, the band at 2144 which is very close to th”
Farra 等 - 2013 - Understanding CeO2 as a Deacon catalyst by probe m DOI: 10.1039/C2CP42767B -
Adsorbed carbon monoxide 信頼度 1.0
“7 showed bands typical of carbon max cm-1, dioxide (at 2359-2310 attributed to asymmetric stretching vibration and at cm-1 669 attributed to the degenerate bending vibration), carbon monoxide (at cm-1 *2186 and 2114 related to stretching vi”
Transparent sulfur-containing thermoplastic polyurethanes with polyether and polycarbonate soft segments DOI: 10.1007/s00289-017-2088-x -
Adsorbed carbon monoxide 信頼度 1.0
“7 3D plots of FTIR spectra of volatile products obtained during cm-1, 916 connected with C-H out-of-plane deformation the thermal decomposition of the RPURs H and HM vibration of vinyl group) and carbon monoxide (at cm-1, *2186 attributed t”
Aliphatic polycarbonate-based thermoplastic polyurethane elastomers containing diphenyl sulfide units DOI: 10.1007/s10973-016-5420-z
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