What absorbs at 769 cm⁻¹ in an FTIR spectrum?
A band near 769 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 769 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 | 2 | 2 | 1.0 |
| Hydroxyl (O-H) | 2 | 2 | 1.0 |
| Silicon-oxygen (Si-O) | 1 | 1 | 1.0 |
| Silicon (Si) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 0.9 |
| N h | 1 | 1 | 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。
可能的材料
| 材料 | 支持峰 | 重疊基團 | 引用來源 |
|---|---|---|---|
| PEG | 769, 1650, 1342 | Hydroxyl (O-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 769 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
-
Hydroxyl (O-H) 信心 1.0
“However, the cm-1 broad intense band at 3400-3419 in the sample showed the existence of -OH stretching vibration (hydroxyl / phenol) generated by the phenol group, which was confirmed by the presence of 768.55 cm-1 in the non-anneal sample.”
Fabiani 等 - 2020 - Green synthesis and characterization of Zinc Ferri DOI: 10.1088/1755-1315/599/1/012066 -
Alkyl C-H 信心 1.0
“the wagging deformation band at 769 from C-H Additionally, 1,5-hexadiene was identified as a decomposition various vibrations of the hexene moiety, which were also Creative β-elimination) product (via a for all hb-FRs via the bands at obser”
Battig 等 - 2019 - Hyperbranched phosphorus flame retardants multifu DOI: 10.1039/c9py00737g -
Hydroxyl (O-H) 信心 1.0
“cm-1 3678 [34,35] and O-H deformation at 765 and 769 The band occurred at 2860 due to 3678 cm-1 [34,35] and O-H deformation at 765 and 769 cm-1.”
Kumar 等 - 2020 - Polyethylene Glycol (PEG) Modified Porous Ca-5(PO4 DOI: 10.3390/coatings10060538 -
信心 1.0
“The stretching vibration characteristic peaks of the Fe-O bond in ferrate were obThe stretching vibration characteristic peaks of the Fe-O bond in ferrate were obtained cm-1, cm-1, cm-1 tained at around 700 cm-1, 769 cm-1, 879 cm-1 and conf”
Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt DOI: 10.3390/w13192619 -
Silicon (Si) 信心 1.0
“The band at 769 was assigned to the Si-O symmetric cm-1 stretching or bending mode whereas the band at 947 was assigned to the Si-O stretching mode of non-bridging oxygen.”
Zaid 等 - 2017 - Effect of Sintering on Crystallization and Structu DOI: 10.2298/SOS1704409Z -
Metal oxygen 信心 0.9
“Explicit assignment.”
Saliu 等 - 2017 - Catalytic crosslinking of a regenerated hydrophobi DOI: 10.1515/epoly-2016-0289 -
Phosphate (PO4) 信心 0.9
“Text: '769 cm-1 stretching of C-OP bond'”
Yasmin 等 - 2022 - Biosorptive Potential of Pseudomonas species RY12 DOI: 10.1177/15593258221117352 -
信心 0.8
“Text: 'ν (ν ν (ν region accounts for the fundamental bands = 768.809'”
High resolution FTIR spectrum of CH2D79Br: the ground, v5 = 1 and v9 = 1 state constants DOI: 10.1080/00268970903567270
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。