What absorbs at 2241 cm⁻¹ in an FTIR spectrum?
A band near 2241 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 6 cited sources
Quick answer
A band near 2241 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.
Mogelijke functionele-groeptoewijzingen
| Functionele groep | Ondersteunende feiten | Geciteerde bronnen | Hoogste vertrouwen |
|---|---|---|---|
| Alkyl C-H | 1 | 1 | 1,0 |
| Nitrile | 1 | 1 | 1,0 |
| Aromatic ring | 1 | 1 | 1,0 |
| Secondary amine | 1 | 1 | 1,0 |
| C n single bond | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Isocyanate | 1 | 1 | 0,95 |
| C#c | 1 | 1 | 0,9 |
Ranglijst weerspiegelt cumulatief literatuurbewijs, niet één gezaghebbende regel. Bevestig altijd aan de hand van uw monsterecontext.
Possible materials
| Materiaal | Ondersteunende pieken | Overlapping groups | Geciteerde bronnen |
|---|---|---|---|
| polyurethane | 2241, 2270, 1700 | Alkyl C-H | 2 |
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 2241 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.
Literatuur achter deze toewijzingen
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Amide vertrouwen 1,0
“EtCN@2(cid:1)EtCN also showed that the peak assignable to the amon (Elsevier), Oxford, UK (1996) cm-1 : C N stretching vibration at 2241 shifted to the 2.”
Higa 等 - 2010 - Simplified bicyclic cage-type molecule as a C (3) DOI: 10.1007/s10847-009-9681-z -
Aromatic ring vertrouwen 1,0
“The overall activation energy is calculated as The formation of copolymer(s) is evidenced by FTIR as it shows bands at 2241.37cm21and2925.07cm21duetothecyanidegroupofacrylonitrile CZH H1NMR [North and aromatic stretching band of limonene, r”
Sharma 和 Srivastava - 2003 - Radical copolymerization of limonene with acryloni DOI: 10.1081/PPT-120017966 -
Alkyl C-H vertrouwen 1,0
“The absorption peak at 2935 was due to the stretching cm-1 vibration of the C-H bond in CH 2, and the peak at 2241 was ascribed to the stretching vibration cm-1, cm-1,”
Ren 等 - 2018 - Polyvinyl Alcohol Reinforced Flame-Retardant Polya DOI: 10.3390/ma11122391 -
Isocyanate vertrouwen 0,95
“Text: 'banda característica do grupo isocianato em 2241 cm-1'”
de Almeida 等 - 2016 - Preparation and characterization of polyurethane w DOI: 10.1590/0104-1428.2151 -
C#c vertrouwen 0,9
“Explicit assignment: 'confirmed C≡C 2241cm-1'”
Munir 等 - 2022 - Design and Synthesis of Conducting Polymer Bio-Bas DOI: 10.1155/2022/6815187 -
vertrouwen 0,9
“Explicit assignment in text.”
A novel family of homoleptic copper(i) complexes featuring disubstituted cyanamides: a combined synthetic, structural, and theoretical study DOI: 10.1039/c7nj02798b
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