What absorbs at 3389 cm⁻¹ in an FTIR spectrum?

快速回答

A band near 3389 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 3389 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

• N h 信心 1.0

  “The origin cm-1 of the vibration bands is as follows: at 3389 due to the NH stretching vibrations, cm-1 cm-1 at 2936 due to a CH-stretching vibrations, at 620 due to CH out-of-plane bending vibration.”

  Synthesis and characterization thin films of conductive polymer (PANI) for optoelectronic device application DOI: 10.1063/1.4948838
• Amide 信心 1.0

  “Moderate exposure of the cm(cid:0) 1), O-H BRG peaks, displaying stretching (band A, 3389 amide I hydrophobic protein groups promoted the protein-oil interaction, cm(cid:0) 1), C¼O N-H (band B, stretching, 1648 amide II (band C, bending, co”

  Effect of different carbohydrates on the functional properties of black rice glutelin (BRG) modified by the maillard reaction DOI: 10.1016/j.jcs.2020.102979
• Hydroxyl (O-H) 信心 1.0

  “derived from castor oil, showed the -OH group bending band at 3389 The bands cm-1 at 2926, 2855, and 1739 were designated to asymmetric stretching and symmetric stretching of the CH group and C=O group, respectively.”

  Impact of Diisocyanates on Morphological and In Vitro Biological Efficacy of Eco-Friendly Castor-Oil-Based Water-Borne Polyurethane Dispersions DOI: 10.3390/polym14173701
• Hydrogen bond 信心 1.0

  “11.3 stretching (5) Si-O asymmetric 1154 1144 1130 1167 stretching (6) N-H(cid:5)(cid:5)(cid:5)N stretching 3341 3345 3351 3358 that there are no N-N and H-H bonds present in the (7) N-H stretching 3389 3396 3399 3403”

  Ay 和 Aydinli - 2004 - Comparative investigation of hydrogen bonding in s DOI: 10.1016/j.optmat.2003.12.004
• 信心 1.0

  “cm-1, XN-NIC XN-GA was also distinguished in and with a new band at 3352 and 3389 cm-1 respectively, and upshift of band at ca.”

  Budziak 等 - 2019 - Formation of Prenylated Chalcone Xanthohumol Cocry DOI: 10.3390/molecules24234245
• Hydroxyl (O-H) 信心 1.0

  “LLM confirmed rule peak-group candidate”

  Helen 等 - 2023 - Amelioration of ionic conductivity (303 K) with th DOI: 10.21203/rs.3.rs-1557220/v1
• N h 信心 1.0

  “Conversely to the PURs the PUR-M revealed the well-shaped NH band was observed as well, but its intensity relating to the "free" NH (3389 cm-1) in the PUR-M stretching band related to the moderate and strong hydrogen bonds present in the HS”

  The Influence of Calcium Glycerophosphate (GPCa) Modifier on Physicochemical, Mechanical, and Biological Performance of Polyurethanes Applicable as Biomaterials for Bone Tissue Scaffolds Fabrication DOI: 10.3390/polym9080329
• Carbonyl (C=O) 信心 1.0

  “The key feature absorption bands appeared at (1741-1748 which were cm-1 assigned to carbonyl (C=O) as well as a diminishing in the strength of the band at 3388.93 which was attribcm-1) uted to OH vibration, and the peak at (1365-1372 was at”

  Ferric perchlorate hydrate as a new catalyst for highly efficient esterification of cellulose at room temperature DOI: 10.1038/s41598-022-09669-w