What absorbs at 1490 cm⁻¹ in an FTIR spectrum?
A band near 1490 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
可能的官能基指派
| 官能基 | 支持事實 | 引用來源 | 最高信心 |
|---|---|---|---|
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| C=n | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 0.9 |
| Alkyl C-H | 1 | 1 | 0.9 |
| Methyl | 1 | 1 | 0.9 |
| Quaternary ammonium | 1 | 1 | 0.9 |
| N h | 1 | 1 | 0.8 |
| Sulfur heterocycle | 1 | 1 | 0.8 |
| Amide | 1 | 1 | 0.7 |
| Bronsted acid site | 1 | 0 | 0.9 |
| Lewis acid site | 1 | 0 | 0.9 |
排名反映累積的文獻證據，而非單一權威規則。請務必根據您的樣品背景進行確認。
這些指派背後的文獻
-
C=n 信心 1.0
“Associated with C=N and C=C stretching vibrations of quinone and benzene rings.”
Abdolahi 等 - 2012 - Synthesis of Uniform Polyaniline Nanofibers throug DOI: 10.3390/ma5081487 -
信心 1.0
“Assigned to (C)N-H in amide”
Culica 等 - 2019 - Recyclable Polymer-Supported N-Hydroxyphthalimide DOI: 10.3390/ma12213585 -
Nitrogen heterocycle 信心 1.0
“Characteristic pyridine band.”
Liu 等 - 2021 - Novel hydrophobic catalysts to promote hydration a DOI: 10.1039/d1ra01188j -
信心 0.95
“Strong band at 1490 cm-1 related to pyridine associated with all acid sites, including hydrogen bonding.”
Martins 等 - 2020 - Synergistic Action of Montmorillonite with an Intu DOI: 10.3390/polym12122781 -
Quaternary ammonium 信心 0.9
“Sharp peak attributed to quaternary ammonium group stretching vibration.”
Xu 等 - 2012 - A composite membrane of caesium salt of heteropoly DOI: 10.3390/membranes2030384 -
Methyl 信心 0.9
“Explicit assignment: 'strong band at 1490cm-1, assigned to the asymmetric methyl deformation mode'”
Andrade 等 - 2012 - Effect of Tetramethylammonium Hydroxide on Nucleat DOI: 10.1155/2012/454759 -
信心 0.9
“Text: 'PS (red, peak at 1490)'”
Bergami 等 - 2020 - Plastics everywhere first evidence of polystyrene DOI: 10.1098/rsbl.2020.0093 -
Alkyl C-H 信心 0.9
“Explicit assignment: 'CH bending vibrations at around 1490'”
Ghosal 等 - 2017 - Structural and Surface Compatibility Study of Modi DOI: 10.1208/s12249-016-0500-8
有包含此波峰的圖譜嗎？
上傳您的FTIR圖譜，幾秒內即可獲得完整的解讀報告——包含帶有文獻引用的峰位指派、圖譜庫比對以及信心等級評估的證據鏈。
解讀我的圖譜