What absorbs at 2180 cm⁻¹ in an FTIR spectrum?
A band near 2180 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 2180 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.
Atribuiri posibile ale grupelor funcționale
| Grup funcțional | Fapte suport | Surse citate | Încredere maximă |
|---|---|---|---|
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Adsorbed carbon monoxide | 1 | 0 | 1,0 |
Clasamentul reflectă dovezile acumulate din literatură, nu o singură regulă autoritară. Confirmați întotdeauna în contextul mostrei dvs.
Possible materials
| Material | Vârfuri suport | Overlapping groups | Surse citate |
|---|---|---|---|
| zeolite | 2180, 1013, 1245 | Hydroxyl (O-H), Silicon (Si) | 1 |
| CO | 2180, 1670, 1620 | 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 2180 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.
Literatura din spatele acestor atribuiri
-
Carbonyl (C=O) încredere 1,0
“as indicating majority of authors cite values below 2000 carbonyl band near 2180 They also found that CO rapidly”
Kumar 等 - 2011 - In Situ FT-IR Study on the Effect of Cobalt Precur DOI: 10.1021/jp104878e -
Silicon hydride încredere 1,0
“A Si-H peak position of cm-1 2180 in the Fourier transform infrared absorption spectrum indicates a N/Si ratio around 1.2.”
Low Temperature Silicon Nitride by Hot Wire Chemical Vapour Deposition for the Use in Impermeable Thin Film Encapsulation on Flexible Substrates DOI: 10.1166/jnn.2011.5100 -
Hydroxyl (O-H) încredere 1,0
“However, there probe the BAS and yield the band at 2180 is no considerable variation in BAS in exchanged zeolites, comFTIR difference spectra in the hydroxyl-stretching region dis-”
Batool 等 - 2022 - Correlating Lewis acid activity to extra-framework DOI: 10.3929/ethz-b-000536201 -
încredere 0,9
“Explicit assignment in snippet: '2180 cm- band (CO adsorbed on TiO2)'.”
Rasko 等 - 2007 - Characterization of Au-RhTiO2 catalysts by CO ads DOI: 10.1007/s11144-007-5080-x -
încredere 0,7
“Band at 2180 cm-1 mentioned as CO band.”
Rasko 和 Kiss - 2006 - CO oxidation in the presence of hydrogen on AuTiO DOI: 10.1007/s10562-006-0133-8
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