What absorbs at 2175 cm⁻¹ in an FTIR spectrum?
A band near 2175 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 6 cited sources
快速回答
A band near 2175 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 |
|---|---|---|---|
| Silanol (Si-OH) | 2 | 1 | 1.0 |
| C#c | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Bronsted acid site | 1 | 1 | 1.0 |
| Bromine | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 0.9 |
| Methyl | 1 | 1 | 0.9 |
| Hydroxyl (O-H) | 1 | 0 | 1.0 |
| Lewis acid site | 1 | 0 | 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。
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 2175 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
-
Bromine 信心 1.0
“FULL PAPER cm-1, cm-1, a signal centred at 2175 due to the stretching mode of CO mode, which in the liquid phase appears at 1611 is very interacting with Brønsted acid sites, is present in all spectra, sensitive to the acidity of the OH sit”
Erigoni 等 - 2016 - Creating Accessible Active Sites in Hierarchical M DOI: 10.1038/ncomms9633. -
C#c 信心 1.0
“Characterization of Isolated Strains cm-1, 2175.12 which is the seventh peak, is due to the vibrations of alkynes (carbon-carbon triple bond).”
Shakeri 等 - 2022 - Biosynthesis of Selenium Nanoparticles and Evaluat DOI: 10.1155/2022/4118048 -
信心 0.9
“Single band centered at ~2175 cm-1 for free CNR.”
Blouin 和 Olson - 2010 - The Stretching Frequencies of Bound Alkyl Isocyani DOI: 10.1021/bi100172c. -
Methyl 信心 0.9
“Symmetric CH3 stretching and asymmetric CH2 stretching”
A comparison of chitosan properties after extraction from shrimp shells by diluted and concentrated acids DOI: 10.1016/j.heliyon.2020.e03486 -
Silanol (Si-OH) 信心 0.8
“Band at 2175 for acetonitrile on silanols”
In Situ FT-IR Characterization of CuZnZr/Ferrierite Hybrid Catalysts for One-Pot CO2-to-DME Conversion DOI: 10.3390/ma11112275 -
信心 0.8
“Text: 'band at 2175 and the CuN'”
Santoro 等 - 2015 - Synthesis, characterization and cellular location DOI: 10.1039/c4dt03598d
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。