What absorbs at 785 cm⁻¹ in an FTIR spectrum?
A band near 785 cm⁻¹ can point to several functional groups. Below are the most likely assignments, ranked by how much published evidence supports each — every one traceable to literature (DOI) and cross-validated against our 130,000+ reference spectra and knowledge graph.
Backed by 8 cited sources
クイックアンサー
A band near 785 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
| 官能基 | 裏付け事実 | 引用元 | 最高信頼度 |
|---|---|---|---|
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| Alkyl C-H | 3 | 3 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Nucleic acid | 2 | 2 | 1.0 |
| Silicon carbon | 2 | 1 | 1.0 |
| N h | 2 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Carboxyl (COOH) | 1 | 1 | 1.0 |
| Hydroxyl (O-H) | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| Alkene (C=C) | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
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
| 素材 | 補助ピーク | 重複グループ | 引用元 |
|---|---|---|---|
| polypyrrole | 785, 1700, 400 | Alkyl C-H | 1 |
| TiO2 | 785, 1700, 1093 | Alkyl C-H | 1 |
| PPy | 785, 1043, 910 | Alkyl C-H | 1 |
| silicate | 785, 1000, 1037 | Silicon-oxygen (Si-O), Silicon (Si), Alkyl C-H | 1 |
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 785 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
“At the wave number 785.05 cm-1 there is absorption band of Si-O-Al.”
Synthesis and catalytic activity of mesoporous Al-MCM-41/UiO-66 for esterification of oleic acid DOI: 10.1063/1.5082500 -
Nitrogen heterocycle 信頼度 1.0
“belongs to s-triazine ring (C 3N 3) bending mode indicating The peak at 785”
Ramesh 等 - 2010 - Synthesis of Nano Structured Carbon Nitride by Pyr DOI: 10.1080/10584587.2010.489421 -
Alkene (C=C) 信頼度 1.0
“found at 1230 which is due to C-O-C aliphatic ester cm-1 cm-1 stretching and peak of 810-760 band is at 785 FTIR spectroscopy for dosimetry which is due to =C-H bending [20].”
Sahoo 等 - 2020 - A new approach for high-dose measurement using CR- DOI: 10.1007/s10967-020-07232-3 -
信頼度 1.0
“cm-1 cm-1 cm-1) ip 1260 (Si-CH stretching), doublet peak (1072 and 1007 (Si-O-Si 3 t 785cm-1 stretching) and (Si-CH wagging) (Fig.”
Bao 等 - 2018 - Manufacturing and characterization of long-acting DOI: 10.1016/j.ijpharm.2018.09.004. -
Alkyl C-H 信頼度 1.0
“The cm-1 typical bands of PPy, at 1540/1550 (C-C stretching in pyrrole ring of PPy salt/base), cm-1 cm-1 1450 (C-N stretching in pyrrole ring), 1310 (C-H and C-N in-plane deformacm-1 cm-1 (N-H+ tions), 1170 (C-H and N-H in-plane deformation”
Polypyrrole Aerogels: Efficient Adsorbents of Cr(VI) Ions from Aqueous Solutions DOI: 10.3390/gels9070582 -
信頼度 1.0
“ν(NS)δ(CCC) vibrational mode in both complexes”
Ni-thiosaccharinate complexes: synthesis, characterization and DFT studies. Biological properties as superoxide dismutase mimetics and as anti-carcinogenic agents DOI: 10.1016/j.ica.2019.04.040 -
N h 信頼度 1.0
“cm1 The absorption band at 785 (figure 4a) corresponds to NH wagging [34].”
Interaction of (3-Aminopropyl)triethoxysilane With Late Ar-N 2 Afterglow: Application to Nanoparticles Synthesis DOI: 10.1002/ppap.201500201 -
Hydroxyl (O-H) 信頼度 1.0
“As OTi bond, and the band at 785 to the As OH vibrations.”
Polymerization of silicate on TiO2 and its influence on arsenate adsorption: An ATR-FTIR study DOI: 10.1016/j.colsurfa.2015.01.021
このバンドを持つスペクトルがありますか？
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