What absorbs at 2240 cm⁻¹ in an FTIR spectrum?
A band near 2240 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 8 cited sources
クイックアンサー
A band near 2240 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.
可能性のある官能基アサイン
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Nitrile | 5 | 4 | 1.0 |
| Alkyl C-H | 4 | 3 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 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 | 1.0 |
| C=n | 1 | 0 | 1.0 |
ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。
スペクトルロジック
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 2240 cm⁻¹ is usually not enough for material identification by itself.
実使用例
この種のクエリは、ポリマー識別、未知のプラスチックスクリーニング、QCトラブルシューティング、リサイクル材料の検証、および文献に基づいたピーク帰属のレビューで一般的です。
よくある間違い
- 少なくとも1～2つの支持ピークを確認せずに、1つの孤立したバンドを材料の証拠として扱うこと。
- 重複を無視: 複数の官能基が同じ波数付近に寄与することがあります。
- 添加剤、ブレンド、酸化、または汚染がスペクトルを歪める可能性がある場合に検証を省略すること。
検証アドバイス
曖昧さが残る場合は、特にブレンド、劣化サンプル、充填ポリマーについて、DSC、GC-MS、またはTGAで仮説を検証してください。
これらのアサインの根拠となる文献
-
Isocyanate 信頼度 1.0
“LLM confirmed rule peak-group candidate”
El-Shekeil 等 - 2012 - Effect of pMDI isocyanate additive on mechanical a DOI: 10.1177/0021998310385030) -
Alkyl C-H 信頼度 1.0
“It can be seen that, by increasing intensity of treatment (either the temperature or the duration), It can be seen that, by increasing intensity of treatment (either the temperature or the duration), thepeaksat2940and2240cm-1 the peaks at 2”
Konstantopoulos 等 - 2020 - Introduction of a Methodology to Enhance the Stabi DOI: 10.3390/ma13122749 -
Nitrile 信頼度 1.0
“LLM confirmed rule peak-group candidate”
Novel Mixed Matrix Membranes Based on Polymer of Intrinsic Microporosity PIM-1 Modified with Metal-Organic Frameworks for Removal of Heavy Metal Ions and Food Dyes by Nanofiltration DOI: 10.3390/membranes12010014 -
Nitrile 信頼度 1.0
“LLM confirmed rule peak-group candidate”
Lee 等 - 2021 - Effects of Various Transition Metals on the Therma DOI: 10.21203/rs.3.rs-230180/v1 -
Alkyl C-H 信頼度 1.0
“450° strong C-H peak at vibrations of C-O and C-H in the regions of 2025 to C in all samples could be attributed 2240cm-1 3035cm-1, to evolution of CH and 2620 to respectively;”
Masite 等 - 2022 - Trace Metals, Crude Protein, and TGA-FTIR Analysis DOI: 10.1155/2022/1509569 -
Nitrile 信頼度 1.0
“cm(cid:3)1 about 2240 all samples show the behavior that we already have described before in detail for homopolymer cm(cid:3)1 PAN.21 The starting peak at 2240 disappears with increasing temperature in favor of a new nitrile peak at cm(cid:”
Investigation of the chemical changes during the thermal treatment of acrylonitrile‐co‐methyl acrylate‐polymer (polyacrylonitrile‐precursor) focusing on the fate of the methyl acrylate moiety DOI: 10.1002/app.52074 -
Alkyl C-H 信頼度 1.0
“plasticfibrelyingonit(a).(Toprightandbottompanels)2DFTIR assigned to PU are the following: at 3062 (aromatic CH imaging maps, where the intensity of the following bands was (C-H (C-N stretching region, 2962 stretching), 1743 (C=O mapped: 29”
Assessment of microplastic pollution: occurrence and characterisation in Vesijärvi lake and Pikku Vesijärvi pond, Finland DOI: 10.1007/s10661-019-7843-z -
Acetate 信頼度 1.0
“In addition, the bands at 2240cm-1 are characteristic peaks of CO, which is mainly formed by the 2060 breaking of C-O-C and C=O [20].”
Wang Qing 等 - 2015 - GASEOUS EMISSION AND THERMAL ANALYSIS DURING CO-CO DOI: 10.3176/oil.2015.4.05
このバンドを持つスペクトルがありますか？
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