What absorbs at 742 cm⁻¹ in an FTIR spectrum?

クイックアンサー

A band near 742 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 742 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

• 信頼度 1.0

  “The band at cm-1 742 is probably due to the Ca-O bonds [7].”

  Characterization of quicklime as raw material to hydrated lime: Effect of temperature on its characteristics DOI: 10.1063/1.5066668
• C-S single bond 信頼度 1.0

  “LLM confirmed rule peak-group candidate”

  Mesoporous Magnetic Cysteine Functionalized Chitosan Nanocomposite for Selective Uranyl Ions Sorption: Experimental, Structural Characterization, and Mechanistic Studies DOI: 10.3390/polym14132568
• Carbonyl (C=O) 信頼度 1.0

  “The corresponding light minus dark FTIR difference spectrum ν(C=O) (Figure 4, in the region black line) shows a sigmoidal cm-1 and a positive peak at band with a negative peak at 1,742 cm-1, that are absent in the difference spectrum of the”

  Baserga 等 - 2022 - Membrane Protein Activity Induces Specific Molecul DOI: 10.3389/fmolb.2022.915328
• Acetate 信頼度 1.0

  “The band at 742 cm-1 is assigned to the CH3 rocking cm-1 CH rocking mode, while 596 and 562 are related to [ νasGa-C 2] and [ νsGa-C 2].”

  Synthesis of High Surface Area—Group 13—Metal Oxides via Atomic Layer Deposition on Mesoporous Silica DOI: 10.3390/nano12091458
• Acetate 信頼度 1.0

  “cm-1, cm-1, cm-1, cm-1, C-CH3 stretching at 1042-1046 cm-1, C-COO vibration assigned to 873 cm-1, (possibly due to the to 1095-1098 C-CH stretching at 1042-1046 C-COO vibration assigned to 873 3 cm-1, presence of CaCO3), C=O stretching assi”

  Impact of the Fused Deposition (FDM) Printing Process on Polylactic Acid (PLA) Chemistry and Structure DOI: 10.3390/app7060579
• C c single bond 信頼度 1.0

  “The third one at 1477 cm-1 was associated with CH-cross deformations in CH 2-groups and the fourth band at 742 cm-1 was assigned to H-C-C-H-bound modes in the CH groups.”

  Fernández 等 - 2017 - DOI: 10.17230/ingciencia.13.25.6
• Phosphate (PO4) 信頼度 1.0

  “The bending modes of the P-O bonds in phosphate groups are responsible for the double peak at 563 and 742 cm-1.”

  Synthesis and Characterization of New Composite Materials Based on Magnesium Phosphate Cement for Fluoride Retention DOI: 10.3390/ma16020718
• Acetate 信頼度 1.0

  “cm-1 (imide carbonyl asymmetric stretching), 1715 (imide carbonyl symmetric stretchcm-1 ing and C=O stretching of carboxylic pendant groups), 1370 (C-N stretching), and cm-1 cm-1 742 (C=O bending).”

  Novel Polyimide/Copper-Nickel Ferrite Composites with Tunable Magnetic and Dielectric Properties DOI: 10.3390/polym