What absorbs at 3331 cm⁻¹ in an FTIR spectrum?
A band near 3331 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
快速回答
A band near 3331 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.
可能的官能基指派
| 官能基 | 支持事實 | 引用來源 | 最高信心 |
|---|---|---|---|
| Hydroxyl (O-H) | 8 | 8 | 1.0 |
| Hydrogen bond | 3 | 2 | 1.0 |
| N h | 2 | 2 | 1.0 |
| Metal oxygen | 1 | 1 | 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 |
| Carbohydrate | 1 | 1 | 1.0 |
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。
可能的材料
| 材料 | 支持峰 | 重疊基團 | 引用來源 |
|---|---|---|---|
| TiO2 | 3331, 1700, 1093 | Metal oxygen, Hydroxyl (O-H) | 1 |
| polyurethanes | 3331, 1740, 1728 | N h | 1 |
| TiO | 3331, 1730, 1699 | Hydroxyl (O-H), Metal oxygen | 1 |
| polysaccharide | 3331, 1637, 1320 | Hydroxyl (O-H), N h | 1 |
| polyurethane | 3331, 2270, 1700 | N h | 1 |
| TiO2 nanoparticles | 3331, 1700, 455 | Hydroxyl (O-H), Metal oxygen, N h | 1 |
僅當同一文獻庫支援此波段以及至少一個額外特徵峰時，才會顯示材料。
光譜邏輯
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 3331 cm⁻¹ is usually not enough for material identification by itself.
實際使用
此類查詢常見於聚合物鑑別、未知塑膠篩選、品管故障排除、再生材料驗證，以及基於文獻的峰值歸屬審查。
常見錯誤
- 將一個孤立的譜帶視為材料的證據，而未檢查至少一兩個支持峰。
- 忽略重疊：多個官能團可能在相同波數附近貢獻。
- 當添加劑、混合物、氧化或污染物可能扭曲譜圖時，跳過驗證。
驗證建議
當仍然存在歧義時，使用DSC、GC-MS或TGA驗證假設，特別是對於混合物、降解樣品和填充聚合物。
這些指派背後的文獻
-
Carbohydrate 信心 1.0
“Strong absorption was observed at 3279.62, 3272.35 glucose and galactose and xylose with different concentracm-1 corresponding to the hydroxyl vibration and 3331.21 tion which is dependent on many factors.”
Evaluation of the effect of soluble polysaccharides of palm kernel cake as a potential prebiotic on the growth of probiotics DOI: 10.1007/s13205-018-1362-4 -
Hydroxyl (O-H) 信心 1.0
“Interestengly, there was a strong absorption with a wide and strong band centred cm-1 at 3331 (O-H stretch) only observed in the untreated sample.”
Firsoni 等 - 2019 - Fiber Content and Relative Feed Value Estimation o DOI: 10.1088/1757-899X/546/4/042008 -
Hydroxyl (O-H) 信心 1.0
“cm-1 showed a decrease in the initial compounds and endings, especially at the 3331 peaks of the Delfín-Narciso,D.;Díaz,F.Impactof Geotrichum candidum O-H bonds.”
Impact of Dragon Fruit Waste in Microbial Fuel Cells to Generate Friendly Electric Energy DOI: 10.3390/su15097316 -
Acetate 信心 1.0
“assigned to the asymmetrical stretching of C-O-C groups and cm-1 The PU spectrum shows a strong absorption at 3331 cm-1 the C-O stretching vibrations at 1109 of the urethane arising from H-bonded N-H.”
Gabriela Echeverria 等 - 2015 - PolyurethanePoly(2-(Diethyl Amino)Ethyl Methacryl DOI: 10.1590/0104-1428.1716 -
N h 信心 1.0
“Explicit assignment in text: '3449 and 3331 (N-H stretch)'”
Supramolecular Interactions Induce Unexpectedly Strong Emissions from Triphenylamine-Functionalized Polytyrosine Blended with Poly(4-vinylpyridine) DOI: 10.3390/polym9100503 -
Metal oxygen 信心 1.0
“In TiO 2-DHBAOA, the bands at the FTIR spectrum of TiO cm-1, assigned to the stretching vibra3331 and 3233 tions of aldehyde phenolic -OH groups, and bands cm-1, corresponding to the bending at 1389 and 1192”
Radoman 等 - 2015 - Effect of surface modified TiO2 nanoparticles on t DOI: 10.3144/expresspolymlett.2015.83 -
Hydroxyl (O-H) 信心 1.0
“making it possible to observe the most intense peak at 3331 belonging to cm-1 substances such as carvings or leaves of any kind of fruit or vegetable are used as fuel, the the O-H bonds, while the peak at 2969 and 2805 belongs to the alkane”
Potential Use of Coriander Waste as Fuel for the Generation of Electric Power DOI: 10.3390/su15020896 -
Hydroxyl (O-H) 信心 1.0
“LLM confirmed rule peak-group candidate”
Salman 等 - 2020 - In Vitro Antimicrobial and Antioxidant Activities DOI: 10.3390/molecules25204685
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。