What absorbs at 438 cm⁻¹ in an FTIR spectrum?
A band near 438 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 438 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 |
|---|---|---|---|
| Metal oxygen | 3 | 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 |
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 |
|---|---|---|---|
| ZnO | 438, 1400, 3430 | Metal oxygen, Methacrylate, C-O single bond | 2 |
| Co3O4 | 438, 1050, 450 | Metal oxygen | 1 |
| MWCNT | 438, 2876, 1430 | C-O single bond, Methoxy (OCH3), Methacrylate | 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 438 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
-
信心 1.0
“Thus the peaks at 463.7, 455 and Siga SiAs 438 cm1 could roughly correspond to 0, 1, 2 Al atoms around the SiA, site.”
Kaczor 等 - 1995 - Silicon-related local vibrational mode absorption DOI: 10.4028/www.scientific.net/MSF.196-201.1091 -
信心 1.0
“An FTIR investigation shows that the SnO 2-doped GO nanocomposite exhibits two distinct bands at 733 and cm-1 cm-1 438 due to terminal oxygen vibrations, while samples treated with G-O-Sn-O exhibit bands at 733 due to antisymmetric stretchi”
Reactive Oxygen Species (ROS) Are Generated as Organic Contaminants Are Broken Down: SnO DOI: 10.1007/s12668-023-01111-3 -
Metal oxygen 信心 1.0
“LLM confirmed rule peak-group candidate”
Lai 等 - 2013 - Controlled Synthesis of CaWO4 Microcrystalline via DOI: 10.1080/10584587.2013.780145 -
Metal oxygen 信心 1.0
“due to metal-oxygen stretching vibrations (such as Fe-O, CuO, Mg-O, and Zr-O) at the octahedral and tetrahedral sites in cm-1 lattice.[26] the hexagonal The band at 438 occurs in the 4000 3500 3000 2500 2000 1500 1000 500 cm-1 octahedral si”
Mohammed 等 - 2018 - Enhanced dielectric and optical properties of nano DOI: 10.1088/1674-1056/27/12/128104 -
信心 1.0
“S8a, b and c, pronounced cm-1, peaks were observed at 438 which corresponded to the binding of cationic ions of MG;”
Unveiling the role of novel biogenic functionalized CuFe hybrid nanocomposites in boosting anticancer, antimicrobial and biosorption activities DOI: 10.1038/s41598-021-87363-z -
Acetate 信心 1.0
“The band at 1097 corresponds to the C-O stretching vibration 438 (Arjmandi et al., 2015a;”
Influence of montmorillonite/carbon nanotube hybrid nanofillers on the properties of poly(lactic acid) DOI: 10.1016/j.clay.2020.105925 -
Metal oxygen 信心 1.0
“FTIR spectra peaks fall below 800 The stretching and twisting vibrations of the Zn-O bonds cm-1 are what cause the high intensity peaks at 438, 472, 499, and 519 [18-19].”
Shuaib 等 - 2023 - Investigation the effect of Co3O4 doping on struct DOI: 10.15251/DJNB.2023.181.307 -
信心 0.9
“attributed to E2 (high) mode”
Combustion synthesis, characterization and Raman studies of ZnO nanopowders DOI: 10.1016/j.saa.2011.05.043
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