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
Hurtigt svar
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.
Mulige funktionelle gruppetildelinger
| Funktionel gruppe | Understøttende fakta | Citerede kilder | Højeste tillid |
|---|---|---|---|
| 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 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
Mulige materialer
| Materiale | Understøttende toppe | Overlappende grupper | Citerede kilder |
|---|---|---|---|
| polyurethane | 2241, 2270, 1700 | Alkyl C-H | 2 |
Materialer vises kun, når den samme litteraturpulje understøtter dette bånd og mindst en yderligere karakteristisk top.
Spektrumlogik
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.
Anvendelse i virkeligheden
Denne type forespørgsel er almindelig ved polymeridentifikation, screening af ukendt plast, fejlfinding i kvalitetskontrol, verifikation af genanvendt materiale og litteraturunderstøttet gennemgang af peak-tildeling.
Almindelige fejl
- Behandling af et isoleret bånd som bevis på et materiale uden at kontrollere mindst en eller to understøttende toppe.
- Ignorerer overlap: flere funktionelle grupper kan bidrage nær samme bølgetal.
- Spring validering over, når additiver, blandinger, oxidation eller forurening kan forvrænge spektret.
Verifikationsrådgivning
Når tvetydighed fortsat består, valider hypotesen med DSC, GC-MS eller TGA, især for blandinger, nedbrudte prøver og fyldte polymerer.
Litteratur bag disse tildelinger
-
Amide tillid 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 tillid 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 tillid 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 tillid 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 tillid 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 -
tillid 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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