What absorbs at 693 cm⁻¹ in an FTIR spectrum?

快速回答

A band near 693 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

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

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 693 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

  “The peak at 693 is associated with Fe-O bands cm-1 of MNPs.”

  Covalent diphenylalanine peptide nanotube conjugated to folic acid/magnetic nanoparticles for anti-cancer drug delivery DOI: 10.1016/j.jddst.2017.06.005
• Silicon (Si) 信心 1.0

  “In the spectra of WFD (Figure 7a), the peaks at 992, 776, and 693 cm-1 were attributed to Si-O stretching vibration bands, whereas the peaks at 598 cm-1 corresponded to F-O bond stretching.”

  Kim 等 - 2022 - Removal of Methyl Red from Aqueous Solution Using DOI: 10.3390/ijerph19159030
• Metal oxygen 信心 1.0

  “Contrary to vibration of the Ti-O-O was identified from the band 693cm-1 film within visible absorption peaks arose in undoped TiO2 [16].”

  Gokdemir 等 - 2014 - Structural Modification of Sol-Gel Synthesized V2O DOI: 10.1155/2014/795384
• 信心 1.0

  “790 Si-O stretching, Si-O-Al stretching, (Al, Mg)--O-H, Si-O-(Mg, Al) stretching 693 Si-O stretching, Si-O-Al stretching 538 Si-O bending, Si-O-Al stretching”

  The Fourier transform infrared spectroscopy (FTIR) analysis for the clay mineralogy studies in a clastic reservoir DOI: 10.1007/s13202-021-01449-y
• Phosphate (PO4) 信心 1.0

  “which have absorbance maximum at 1,693 cm-1 The region between 1,180 and 1,300 corresponds to the P=O asymmetric band (mostly in nucleic acids”

  Synchrotron-based FTIR microspectroscopy of protein aggregation and lipids peroxidation changes in human cataractous lens epithelial cells DOI: 10.1038/s41598-020-72413-9
• 信心 1.0

  “vibrational bands at 3696, 3670, 3653 (surface hydroxyl groups stretching vibration), 3621 (Al2Si2O5(OH)4) disclosed vibrational bands at 3696, 3670, 3653 cm-1 (surface hydroxyl groups cm-1 cm-1 (inner hydroxyl groups stretching vibration),”

  Ma 等 - 2019 - Investigation of the Optical, Physical, and Chemic DOI: 10.3390/su11143803
• Aromatic ring 信心 1.0

  “the pure drug showed the characteristic peaks at 1650.76 due to C=O stretching, at 3364.90 due to O-H stretching, 3252.43 due to N-H stretch, 1435.82 due to C-F stretching, 1316.56 due to C-O stretching, 1217.08 due to C-N stretching, and a”

  Dissolution Improvement of Atorvastatin Calcium using Modified Locust Bean Gum by the Solid Dispersion Technique DOI: 10.3797/scipharm.1301-23
• Silicon (Si) 信心 1.0

  “5, from which it can be seen that these decorations contained highly comparable spectral features: Si-O stretching vibrations of alucm-1) minosilicate minerals (at about 1000 and quartz bands at 797, 779 and 693 cm-1.20 It can therefore be”

  {Physicochemical characterisation of pottery from Vinca culture, Serbia, regarding firing temperature and decoration technique} DOI: 10.2298/JSC160823100P