What absorbs at 2243 cm⁻¹ in an FTIR spectrum?
A band near 2243 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 7 cited sources
Quick answer
A band near 2243 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 |
|---|---|---|---|
| Nitrile | 4 | 4 | 1,0 |
| Hydroxyl (O-H) | 1 | 1 | 1,0 |
| Ring structure | 1 | 1 | 1,0 |
| Methacrylate | 1 | 1 | 1,0 |
| Ketone | 1 | 1 | 1,0 |
| Ester | 1 | 1 | 1,0 |
| Carboxyl (COOH) | 1 | 1 | 1,0 |
| Carbonyl (C=O) | 1 | 1 | 1,0 |
| Amide | 1 | 1 | 1,0 |
| Acetate | 1 | 1 | 1,0 |
Rangering afspejler akkumulerede litteraturbeviser, ikke en enkelt autoritativ regel. Bekræft altid mod din prøvekontekst.
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 2243 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.
Litteratur bag disse tildelinger
-
Acetate tillid 1,0
“The bands at 2243 and 1736 cm-1 are due to CN stretching and C=O stretching vibrations, Fabrication of Conductive Composite Films”
Cetiner 等 - 2011 - Characterization of Conductive Poly(Acrylonitrile- DOI: 10.1007/s12221-011-0151-z -
Hydroxyl (O-H) tillid 1,0
“of saturated nitriles at 2243 and peak intensities of hydroxyl O-H band at 3600-3650”
Thongphud 等 - 2011 - Improvement of Hydrophilic Properties on Electrosp DOI: 10.4028/www.scientific.net/AMR.213.103 -
Nitrile tillid 1,0
“2 EXPERIMENTAL PART The intensity of the band at 2243 cm-1 decreases with 2.1 Materials the imidation time significantly, which is ascribed to the decrease of the number of nitrile groups.”
Zhang 等 - 2019 - ISOTHERMAL IMIDATION KINETICS OF POLYMETHACRYLIMID DOI: 10.17222/mit.2019.070 -
Nitrile tillid 1,0
“As shown in the three original nanofibers spectra at room temperature (RT), the characteristic peak at 2243 cm-1 is attributed to the stretching vibration of nitrile group (C≡N) [33,34].”
Liu 等 - 2019 - Preparation, Stabilization and Carbonization of a DOI: 10.3390/polym11071150 -
Nitrile tillid 0,9
“Band at 2243 cm-1 assigned to nitrile groups.”
El-Shishtawy 等 - 2014 - Nucleophilic Addition of Reactive Dyes on Amidoxim DOI: 10.1155/2014/305930 -
Nitrile tillid 0,9
“Explicit assignment: peak at 2243 cm-1 was vibration absorption of -C≡N”
Huang 等 - 2021 - High Selective Isomerization of Glucose to Fructos DOI: 10.1021/acsomega.1c02577 -
tillid 0,8
“Band at 2243 cm-1 is an important peak for PAN structure.”
Seydibeyoglu - 2012 - A Novel Partially Biobased PAN-Lignin Blend as a P DOI: 10.1155/2012/598324
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