What absorbs at 2190 cm⁻¹ in an FTIR spectrum?
A band near 2190 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 5 cited sources
Quick answer
A band near 2190 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.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| Carbonyl (C=O) | 2 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 0.9 |
| Hydroxyl (O-H) | 1 | 0 | 1.0 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
Possible materials
| 材料 | 支持峰 | Overlapping groups | 引用来源 |
|---|---|---|---|
| SiO2 | 2190, 1739, 699 | Methoxy (OCH3) | 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 2190 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.
这些分配背后的文献
-
Silicon (Si) 置信度 1.0
“0.86 - Dab Cs wag 757 0.75 - Hbc Si stretch 2190 (2214.7)”
Gibbons 等 - 2013 - Huge isotope effect on the vibrational lifetimes o DOI: 10.1103/PhysRevB.87.115207 -
Carbonyl (C=O) 置信度 1.0
“cm-1, cm-1, cm-1, 2355 CO band at 2190 carbonyl band at 1749 water band at 3565 cm-1, cm-1.”
Marcilla 等 - 2018 - TGA-FTIR study of the pyrolysis of sodium citrate DOI: 10.1002/jsfa.9121 -
Adsorbed carbon monoxide 置信度 1.0
“The band position at 2190 cm-1 agrees with the assignment to CO adsorbed on Al3+ Absorption, 2”
CuO-Fe2O3 Nanoparticles Supported on SiO2 and Al2O3 for Selective Hydrogenation of 2-Methyl-3-Butyn-2-ol DOI: 10.3390/catal11050625 -
Amide 置信度 1.0
“(cid:4)C, (C(cid:3)N), (C¼C), 222-224 Rf: 0.56 (Acetone: nstretch), 2190.48 1635.90 2889.92, 2858.39 (CH3 Off white solid, Yield: 87%, m.p: cm(cid:2)1): (C¼C), (C-N), (C-O), 3811.32, 3459.81, 3378.02, bend), 1413.79 1179.69 1030.04 hexane (”
7-Hydroxy-4-phenyl-1, 2-dihydroquinoline derivatives: synthesis via one-pot, three-component reaction and structure elucidation DOI: 10.1016/j.heliyon.2020.e05035 -
置信度 0.9
“Peaks at 2185-2190 and 2164 attributed to Ni2+-CO.”
Surface Spectroscopy on UHV-Grown and Technological Ni–ZrO2 Reforming Catalysts: From UHV to Operando Conditions DOI: 10.1007/s11244-016-0678-8
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