What absorbs at 1491 cm⁻¹ in an FTIR spectrum?
A band near 1491 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 1491 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 |
|---|---|---|---|
| Aromatic ring | 5 | 5 | 1.0 |
| Carboxyl (COOH) | 3 | 2 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| Ketone | 1 | 1 | 1.0 |
| Ester | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 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。
可能性のある材料
| 素材 | 補助ピーク | 重複グループ | 引用元 |
|---|---|---|---|
| methylene blue | 1491, 1745, 1739 | Carboxyl (COOH) | 1 |
| HCl | 1491, 1708, 1032 | Aromatic ring | 1 |
同じ文献プールがこのバンドと少なくとも1つの追加の特性ピークをサポートする場合にのみ、材料が表示されます。
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 1491 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
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Aromatic ring 信頼度 1.0
“The peak areas at 1491 and cm-' decreased rapidly, due to the [Nipissing transformation or degradation of the aromatic rings, and the cleavage of the -C-Nof the imide groups, respectively.”
Ha 等 - 2001 - Spectroscopic stuides on the liquid crystal alignm DOI: 10.1080/10587250108028259 -
Aromatic ring 信頼度 1.0
“The FTIR spectrum of the control dye also showed a large band at 1491 cm-1 corresponding to the aromatic stretching vibration of the C=C (Foo et al.”
Biodegradation of Methylene Blue as an Evidence of Synthetic Dyes Mineralization during Textile Effluent Biotreatment by Acinetobacter pittii DOI: 10.1007/s40710-020-00443-6 -
Acetate 信頼度 1.0
“In addition, two bands were observed at 1491 and 1388 that corresponds to C=O stretching and C-C stretching of alkanes respectively.”
Ecotoxicity of Musa paradisiaca leaf extract-coated ZnO nanoparticles to the freshwater microcrustacean Ceriodaphnia cornuta DOI: 10.1016/j.limno.2017.09.004 -
Aromatic ring 信頼度 1.0
“cm-1 [ν(N-H)], to the stretching vibration the band at 1637 cm-1 CO [ν(CO)], stretching vibration the band at 1569 to the quinonoid ring-stretching vibration, the bands at 1505 cm-1 to the benzenoid ring-stretching vibrations, the and 149”
Blaha 等 - 2019 - Role of p-Benzoquinone in the Synthesis of a Condu DOI: 10.1021/acsomega.9b00542 -
Aromatic ring 信頼度 1.0
“FTIR spectra 1600 (typical aromatic skeletal vibration), 1491 (disubstituted benzene ring), 1222 (antisymmetric C-O-C stretching vibration), 934 (O-C vibration 2 in the oxazine ring with a minor contribution from the phenolic ring), 753 (Ar”
Developing Further Versatility in Benzoxazine Synthesis via Hydrolytic Ring-Opening DOI: 10.3390/polym12030694 -
Aromatic ring 信頼度 1.0
“The crystallographic data perspectrum displayed absorption bands at 1491 and refinement 1 taining to crystal structure solution and are given corresponding to the aromatic C=C group while at 1294”
Sadia 等 - 2020 - Schiff-Based Fluorescent-ON Sensor L Synthesis and DOI: 10.1155/2020/2192584 -
Carboxyl (COOH) 信頼度 1.0
“The peaks at 1549 and a cm-1 small peak 1491 are due to the asymmetric and symmetric stretching modes of carboxylic acid, respectively [32].”
Thabede 等 - 2023 - Synthesis of lanthanum metal organic framework usi DOI: 10.15251/DJNB.2023.181.157 -
信頼度 0.8
“Significant peaks of PAni due to C=C ring stretching.”
Applications of chitosan (CHI)-reduced graphene oxide (rGO)-polyaniline (PAni) conducting composite electrode for energy generation in glucose biofuel cell DOI: 10.1038/s41598-020-67253-6
このバンドを持つスペクトルがありますか？
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