What absorbs at 2090 cm⁻¹ in an FTIR spectrum?
A band near 2090 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 2090 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 |
|---|---|---|---|
| Hydrogen bond | 2 | 2 | 1.0 |
| Silicon hydride | 2 | 2 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Nitrile | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Adsorbed carbon monoxide | 1 | 1 | 1.0 |
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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 2090 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
“Two peaks at 2090 and 2081 Al 2 + peak could be due to oxidized Pt, the sample was reduced by are observed when CO O was passed over Pt/CeO 2/Al 2O 2 3”
Bera 等 - 2003 - Promoting effect of CeO2 in combustion synthesized DOI: 10.1021/jp022132f -
信頼度 1.0
“When 0.18 0.03 mol CO/(mol Au) are adsorbed on Au at C, which shows an IR band at 2090 ( oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 0.2 mol CO(mol Au min)-1, which is close to the steady-state turnov”
In Situ Transient FTIR and XANES Studies of the Evolution of Surface Species in CO Oxidation on Au/TiO<sub>2</sub> DOI: 10.1021/jp0568733 -
Adsorbed carbon monoxide 信頼度 1.0
“Keywords: CN(cid:2) 2108cm(cid:2)1 CN(cid:2) and CO adsorbed alone, the band is blue shifted from 2090 to at In comparison of Pt(110) ad 4cm(cid:2)1V(cid:2)1;”
Tian 等 - 2011 - In situ FTIR studies of coadsorption of CNand CO DOI: 10.1016/j.jelechem.2011.04.028 -
Silicon (Si) 信頼度 1.0
“Additionally, the cm-1 peaks at around 2090 are attributed to Si-H bonds (a shift of the Si-H stretching cm-1 mode from 2000 to 2090 is caused by the electronegativity difference between the nearest neighbouring atoms in the network structu”
Cheng 等 - 2007 - Chemically active plasmas for deterministic assemb DOI: 10.1088/0022-3727/40/8/S10 -
信頼度 1.0
“The presence of the band at 2090 can be assigned Pd+ Pd/CeO sample (Fig.”
Towards Methane Combustion Mechanism on Metal Oxides Supported Catalysts: Ceria Supported Palladium Catalysts DOI: 10.1007/s11244-019-01143-8 -
Nitrile 信頼度 1.0
“The cross-section of spectra (Figure 2d) and the rFTIR line around 2090 cm-1 assigned to cyano stretching visample S1 in the OM photography in visible light (Figure 3a) shows a clearly visible ≡ bration ν(C N) (Figure 2e) confirmed the pres”
Multianalytical Study of the Blue Pigments Usage in Serbian Iconography at the Beginning of the 18th-Century DOI: 10.3390/coatings13071200 -
Silicon hydride 信頼度 1.0
“cm-1 and 1100 (bond generated by the interaction of the substrate surface with oxygen present in the cm-1 environment, previous activation), Si-H (640 cm-1 wagging mode and 2000 stretching vibration cm-1 modes), Si-H (2090 stretching vibrat”
Gomez-Montano 等 - 2020 - Detection of Salmonella enterica on silicon substr DOI: 10.24275/rmiq/Bio993 -
Alkene (C=C) 信頼度 1.0
“The AHC sample cm-1, shows a medium peak at 2090 which is characteristic of stretching allene (C=C=C).”
Microwave-Assisted Hydrothermal Carbonization of Pomegranate Peels into Hydrochar forEnvironmental Applications DOI: 10.3390/en15103629
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