What absorbs at 3349 cm⁻¹ in an FTIR spectrum?

クイックアンサー

A band near 3349 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.

可能性のある官能基アサイン

ランキングは蓄積された文献証拠を反映しており、単一の権威あるルールではありません。常にサンプルのコンテキストと照合して確認してください。

可能性のある材料

同じ文献プールがこのバンドと少なくとも1つの追加の特性ピークをサポートする場合にのみ、材料が表示されます。

スペクトルロジック

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 3349 cm⁻¹ is usually not enough for material identification by itself.

実使用例

この種のクエリは、ポリマー識別、未知のプラスチックスクリーニング、QCトラブルシューティング、リサイクル材料の検証、および文献に基づいたピーク帰属のレビューで一般的です。

よくある間違い

• 少なくとも1～2つの支持ピークを確認せずに、1つの孤立したバンドを材料の証拠として扱うこと。
• 重複を無視: 複数の官能基が同じ波数付近に寄与することがあります。
• 添加剤、ブレンド、酸化、または汚染がスペクトルを歪める可能性がある場合に検証を省略すること。

検証アドバイス

曖昧さが残る場合は、特にブレンド、劣化サンプル、充填ポリマーについて、DSC、GC-MS、またはTGAで仮説を検証してください。

これらのアサインの根拠となる文献

• Hydrogen bond 信頼度 1.0

  “The strong peak at 3349 attributed to the intra-molecular hydrogen bonds for (3)O-H-O(5), as shown in Fig.”

  Manuscript Preparation Instruction for Publishing in Computer Modeling in Engineering and Science (CMES) DOI: 10.3970/cmc.2018.03608
• Hydroxyl (O-H) 信頼度 1.0

  “After modification, a strong and wide band of O-H that overlapped with N-H band (3349 cm-1) cm-1.”

  Synthesis and characterizations of o-nitrochitosan based biopolymer electrolyte for electrochemical devices DOI: 10.1371/journal.pone.0212066
• Secondary amine 信頼度 1.0

  “In peak at 1746 cm-1 cm-1 M4T2,the broad PVP peak FTIR spectrum at 3349 represents the stretching vibration M4T2,the broad PVP peak FTIR spectrum at 3349 cm-1 represents the stretching vibracm-1 of the secondary amine N-H group present in P”

  TiO2 Nanoparticle Filler-Based Mixed-Matrix PES/CA Nanofiltration Membranes for Enhanced Desalination DOI: 10.3390/membranes11060433
• N h 信頼度 1.0

  “cm-1 vibration of the sulphonamide (3395 in pure furosemide, 3397 in physical mixtures), NH stretchingvibrationofthesecondaryaminegroup(3348cm-1 3349cm-1 inpurefurosemide, inphysical”

  Kovacs 等 - 2020 - Influence of Aqueous Solubility-Enhancing Excipien DOI: 10.3390/pharmaceutics12040385
• 信頼度 1.0

  “3357 and Cd (3353 A decrease in the peak wavenumbers occurred in the spectra for Cu for Cu assigned at a band of 3349 cm-1, Pb (3330 cm-1) and Zn (3341 cm-1).”

  Sensitivity and Calibration of the FT-IR Spectroscopy on Concentration of Heavy Metal Ions in River and Borehole Water Sources DOI: 10.3390/app10217785
• Protein 信頼度 1.0

  “The bands between 3349 and 3374 represents the secondary structure of the protein skeleton, which is often used for the quan-”

  Tomczynska-Mleko 等 - 2023 - Co-Gelation of Pumpkin-Seed Protein with Egg-White DOI: 10.3390/foods12102030
• Hydroxyl (O-H) 信頼度 1.0

  “LLM confirmed rule peak-group candidate”

  Reduced graphene Oxide/NiO based nano-composites for the efficient removal of alizarin dye, indigo dye and reduction of nitro aromatic compounds DOI: 10.1016/j.heliyon.2023.e17162
• Hydroxyl (O-H) 信頼度 0.9

  “Broadest absorption peak around 3349 mainly assigned to O-H stretching.”

  Geng 等 - 2020 - Quality Attributes and Microstructure of Cell Wall DOI: 10.3136/fstr.26.281