What absorbs at 2163 cm⁻¹ in an FTIR spectrum?
A band near 2163 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 2 cited sources
Quick answer
A band near 2163 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.
Possíveis atribuições de grupos funcionais
| Grupo funcional | Fatos de suporte | Fontes citadas | Maior confiança |
|---|---|---|---|
| Alkyl C-H | 1 | 1 | 1,0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1,0 |
| Silicon hydride | 1 | 1 | 1,0 |
| Methoxy (OCH3) | 1 | 0 | 1,0 |
| Methacrylate | 1 | 0 | 1,0 |
| C-O single bond | 1 | 0 | 1,0 |
| Acetate | 1 | 0 | 1,0 |
A classificação reflete a evidência acumulada da literatura, não uma única regra autoritária. Sempre confirme com o contexto da sua amostra.
Possible materials
| Material | Picos de suporte | Overlapping groups | Fontes citadas |
|---|---|---|---|
| Chitosan | 2163, 1650, 1655 | Alkyl C-H, Methoxy (OCH3) | 1 |
| cotton fabric | 2163, 900, 862 | Alkyl C-H, Methoxy (OCH3) | 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 2163 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 por trás destas atribuições
-
Silicon hydride confiança 1,0
“LLM confirmed rule peak-group candidate”
Qin 等 - 2022 - Application of SiON Coatings in Sandstone Artifact DOI: 10.3390/coatings12060748 -
Alkyl C-H confiança 1,0
“(CO_Ch, CO_Ch_1w, CO_Ch_5w) as compared to the standard cotton fabric before and after washing cm-1 (CO, CO_ 1w, CO_ 5w) are visible at 3335 due to stretching within the -OH group and amines cm-1 cm-1 and at 2163 due to stretching within th”
Grgac 等 - 2020 - The Chitosan Implementation into Cotton and Polyes DOI: 10.3390/ma13071616
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