What absorbs at 2169 cm⁻¹ in an FTIR spectrum?
A band near 2169 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 2169 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.
Attributions possibles de groupes fonctionnels
| Groupe fonctionnel | Faits à l＇appui | Sources citées | Confiance maximale |
|---|---|---|---|
| Silicon hydride | 3 | 3 | 1,0 |
| Silicon (Si) | 1 | 1 | 1,0 |
| Silicon carbon | 1 | 1 | 1,0 |
| Alkyl C-H | 1 | 1 | 1,0 |
| N-O bond | 1 | 1 | 1,0 |
Le classement reflète les preuves bibliographiques accumulées, et non une règle faisant autorité. Confirmez toujours dans le contexte de votre échantillon.
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 2169 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.
Bibliographie derrière ces attributions
-
N-O bond confiance 1,0
“cm-1 frequency bubbled with CO gas, no peak at 2169 (from a maximum of ca.”
Mucalo 等 - 2007 - In situ characterisation of the aqueous gold collo DOI: 10.1016/j.jcis.2007.01.058 -
Silicon hydride confiance 1,0
“7.9 - 2 Si-H rock 665 106 Si-H(N 2Si) stretching 2169”
Ay 和 Aydinli - 2004 - Comparative investigation of hydrogen bonding in s DOI: 10.1016/j.optmat.2003.12.004 -
Alkyl C-H confiance 1,0
“cm-1 aliphatic CH 2, the band has asymmetric and symmetrical vibration stretches at 2169 The band at 1606 cm-1 is due to the CO in CHO group.”
Theoretical, chemical, and electrochemical studies of Equisetum arvense extract as an impactful inhibitor of steel corrosion in 2 M HCl electrolyte DOI: 10.1038/s41598-022-06215-6 -
Silicon carbon confiance 1,0
“a Estimated by comparing the ratios of integral intensities of Si-H (at ity of these compounds in hydrosilylation reaction with cm-1) cm-1) 2169 and Si-CH (at 1262 bands in the FTIR spectra of 3 PHMS appears to be rather complex.”
Owinska 等 - 2021 - Functionalization of polyhydromethylsiloxane with DOI: 10.1007/s10965-021-02503-3 -
Silicon hydride confiance 0,9
“Explicit assignment: 'Si-H determined by complete disappearance of the IR absorption at about 2169 cm-1'”
Functionalization of surface-grafted polymethylhydrosiloxane thin films with Alkyl side chains DOI: 10.1002/pola.22691
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