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.
可能的官能团归属
| 官能团 | 支持性事实 | 引用来源 | 最高置信度 |
|---|---|---|---|
| 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 |
排名反映了累积的文献证据，而非单一的权威规则。请始终对照您的样品背景进行确认。
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.
这些分配背后的文献
-
Acetate 置信度 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) 置信度 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 置信度 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 置信度 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 置信度 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 置信度 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 -
置信度 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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