What absorbs at 1268 cm⁻¹ in an FTIR spectrum?

クイックアンサー

A band near 1268 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

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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 1268 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

• Acetate 信頼度 1.0

  “The lignin specific FTIR peaks cm-1 noticed at 1268 , depicted the change in lignin's guaicyl ring plus C=O stretch.”

  Majeed 等 - 2017 - Lignin macromolecule's implication in slowing the DOI: 10.1002/star.201600362
• Acetate 信頼度 1.0

  “Although hardwood lignin also contains guacm-1 (12) for syringyl ring and C-O stretch in lignin and iacyl moities, the absorption band at 1268 may have cm-1(13) cm-1.”

  Pandey 和 Pitman - 2003 - FTIR studies of the changes in wood chemistry foll DOI: 10.1016/S0964-8305(03)00052-0
• Acetate 信頼度 1.0

  “The cm-1 peak 1507 could be attributed to an aromatic skeletal of lignin from lignocellulosic cm-1 materials and the medium band at 1268 is attributed to C-O stretching of phenol in lignite”

  Optimization of primary sewage sludge and coal lignite by microwave assisted pyrolysis for the production of bio oil DOI: 10.1080/09593330.2020.1797903
• C-O single bond 信頼度 1.0

  “From the recent degraded sample (A') to the less aged one (B': 19th century), the cm-1 few changes concern the decrease in the intensity band at 1268 related to Car-O of ether group in guaiacyl monomer (methoxyl group branched to aromatic),”

  Impact of Natural Degradation on the Aged Lignocellulose Fibers of Moroccan Cedar Softwood: Structural Elucidation by Infrared Spectroscopy (ATR-FTIR) and X-ray Diffraction (XRD) DOI: 10.3390/fermentation8120698
• Acetate 信頼度 1.0

  “1300-1320 C-O stretch doublet to lower wavenumbers at 1268 and 1245 cm-1 cm-1.”

  Modelling ATR-FTIR Spectra of Dental Bonding Systems to Investigate Composition and Polymerisation Kinetics DOI: 10.3390/ma14040760
• C c single bond 信頼度 1.0

  “The three peaks appearing at 1268, 1390, cm-1 and 2925 are characteristic to C-C, C=C, and C-H stretching vibrations, respectively, proving the presence of alkyl and aryl groups [32,35].”

  Fares 等 - 2021 - Influence of Nitrogen-Doped Carbon Dot and Silver DOI: 10.3390/chemosensors9030052
• Phosphate (PO4) 信頼度 1.0

  “(P-O-C or P-OH stretching), 1268”

  Functionalization of poly(glycidylmethacrylate) with iminodiacetate and imino phosphonate groups for enhanced sorption of neodymium - sorption performance and molecular modeling DOI: 10.1016/j.reactfunctpolym.2022.105389
• Acetate 信頼度 1.0

  “and at 1268 due to cm-1 -C-O-C stretching.”

  Kuen 等 - 2017 - Increased Loading, Efficacy and Sustained Release DOI: 10.3390/nano7110379