What absorbs at 2155 cm⁻¹ in an FTIR spectrum?
A band near 2155 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 2155 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 3 | 2 | 1.0 |
| Adsorbed carbon monoxide | 2 | 0 | 1.0 |
| Silanol (Si-OH) | 1 | 1 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 0 | 1.0 |
| Silicon (Si) | 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 |
|---|---|---|---|
| CeO2 | 2155, 1554, 1630 | Hydroxyl (O-H) | 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 2155 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
-
Hydroxyl (O-H) 信頼度 1.0
“Physisorbed CO results in a band at 2140 cm-1, whereas CO interacting with surface OH groups gives rise to a band at 2155 while cm-1 cm-1 another massif from 2180 to 2245 accounts for CO interacting with Lewis cm-1”
Upgrading the PtCu intermetallic compounds: The role of Pt and Cu in the alloy DOI: 10.1016/j.cattod.2019.11.026 -
Silanol (Si-OH) 信頼度 1.0
“Spectra relative to 80P, 80H correspond to H-bonded cm-1, and 30H samples show a signal, centred at 2155 ascribed to the stretching mode of CO interacting with silanols.”
Erigoni 等 - 2016 - Creating Accessible Active Sites in Hierarchical M DOI: 10.1038/ncomms9633. -
Hydroxyl (O-H) 信頼度 1.0
“on Downloaded B10 cm(cid:2)1 cm(cid:2)1 with the surface OH groups, whereas the band at 2155 in comparison with those from the non-chlorinated Published sample.”
Farra 等 - 2013 - Understanding CeO2 as a Deacon catalyst by probe m DOI: 10.1039/C2CP42767B -
信頼度 0.7
“Context: 'CO stretching region, at low coverages a signal centred at ... cm-1, 2155 arose' and 'C=O bond of the urea group'”
Erigoni 等 - 2019 - Acid properties of organosiliceous hybrid material DOI: 10.1039/C9CY01609K.
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