What absorbs at 2160 cm⁻¹ in an FTIR spectrum?
A band near 2160 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 2160 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.
Mögliche Funktionsgruppenzuweisungen
| Funktionelle Gruppe | Unterstützende Fakten | Zitierte Quellen | Höchstes Vertrauen |
|---|---|---|---|
| Silicon hydride | 4 | 3 | 1,0 |
| N h | 2 | 1 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Nitrile | 1 | 1 | 0,9 |
| Hydroxyl (O-H) | 1 | 0 | 1,0 |
Das Ranking spiegelt die gesammelte Literatur Evidenz wider, nicht eine einzelne maßgebliche Regel. Bestätigen Sie immer anhand Ihres Probenkontexts.
Possible materials
| Material | Unterstützende Peaks | Overlapping groups | Zitierte Quellen |
|---|---|---|---|
| PDMS | 2160, 873, 1080 | Silicon (Si), Silicon carbon | 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 2160 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.
Literatur hinter diesen Zuweisungen
-
Silicon hydride Vertrauen 1,0
“cm-1) cm-1) 3660 and Si-H peak (observed at 2160 417 (1997) relative to Si-O-Si peak as a function of film thickness.”
Bougharouat 等 - 2011 - Plasma polymerization of TEOS for QCM-based VOC va DOI: 10.1051/epjap/2011110144 -
Silicon hydride Vertrauen 1,0
“LLM confirmed rule peak-group candidate”
Sharma 等 - 2012 - Characterization and comparison of silicon nitride DOI: 10.1116/1.3687423 -
Carbonyl (C=O) Vertrauen 1,0
“exhibit five different bands in the carbonyl region at 2133, 2160, 2174, 2185 and 2215 cm-1 The bands at 2160 and 2174 are assigned to CO interacting with SiO-H group and”
Baran 等 - 2016 - Influence of the nature and environment of cobalt DOI: 10.1016/j.micromeso.2015.12.061 -
Silicon carbon Vertrauen 1,0
“cm-1) cm-1) (at ~ 2160 and Si-CH (at ~ 1250 bands in compared to the molecules of functionalized M Although 3 Fig.”
Owinska 等 - 2021 - Functionalization of polyhydromethylsiloxane with DOI: 10.1007/s10965-021-02503-3 -
Silicon (Si) Vertrauen 1,0
“The integral intensity of the cm-1 cm-1 ≈2160 ≈1260 band due to Si-H at and C-H bond from Si-CH groups at were 3 calculated.”
Wojcik-Bania 和 Matusik - 2021 - The Effect of Surfactant-Modified Montmorillonite DOI: 10.3390/ma14102623 -
Nitrile Vertrauen 0,9
“Explicit assignment: C≡N stretching frequency at 2160 cm⁻¹”
Gerber 和 Erasmus - 2018 - Electronic effects of metal hexacyanoferrates An DOI: 10.1016/j.matchemphys.2017.09.029 -
Vertrauen 0,9
“Text: 'IR of consuming crosslinker at peaks 910 and 2160'”
Controlled Preparation of Thermally Stable Fe-Poly(dimethylsiloxane) Composite by Magnetic Induction Heating DOI: 10.3390/polym10050507 -
Vertrauen 0,7
“explicit assignment”
Soft X-ray induced radiation damage in thin freeze-dried brain samples studied by FTIR microscopy DOI: 10.1107/S1600577520010103
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