What absorbs at 804 cm⁻¹ in an FTIR spectrum?
A band near 804 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 804 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 |
|---|---|---|---|
| Alkyl C-H | 4 | 4 | 1.0 |
| Silicon-oxygen (Si-O) | 3 | 3 | 1.0 |
| C-S single bond | 3 | 2 | 1.0 |
| Silicon (Si) | 2 | 2 | 1.0 |
| Aldehyde (CHO) | 1 | 1 | 1.0 |
| Carbonyl (C=O) | 1 | 1 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Nitrogen heterocycle | 1 | 1 | 1.0 |
| Methoxy (OCH3) | 1 | 1 | 1.0 |
| Methacrylate | 1 | 1 | 1.0 |
| C-O single bond | 1 | 1 | 1.0 |
| Acetate | 1 | 1 | 1.0 |
| Silicon carbon | 1 | 1 | 1.0 |
| Siloxane (Si-O-Si) | 1 | 1 | 1.0 |
| Phosphate (PO4) | 1 | 1 | 0.9 |
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 |
|---|---|---|---|
| TiO2 | 804, 1700, 1093 | Alkyl C-H | 1 |
| SiO2 | 804, 1739, 699 | Silicon-oxygen (Si-O), Alkyl C-H, Silicon (Si) | 1 |
| TiO | 804, 1730, 1699 | Alkyl C-H | 1 |
| copolymer | 804, 2921, 1540 | Alkyl C-H | 1 |
| PMMA | 804, 1722, 1383 | 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 804 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
“Si-O antisymmetric cm(cid:3)1, stretching band is found at 1108 Si-O symmetric stretching The FTIR spectra of physical mixtures of CoO and SiO having 2 bandat804cm(cid:3)1,andSi-Orockingmotionbandatapproximately theminimumandmaximummolarfra”
Jonynaite 等 - 2010 - Spectroscopic analysis of blue cobalt smalt pigmen DOI: 10.1016/j.vibspec.2009.12.005 -
Alkyl C-H 信頼度 1.0
“Meanwhile, numerous strong bands 739 804 cm-1, cm-1, cm-1 863 898 and 1455 in DiaRoot suggested the stretching of C-H groups.”
Assiry 等 - 2023 - Microstructural and Elemental Characterization of DOI: 10.3390/app13074517 -
Silicon (Si) 信頼度 1.0
“The characteristic band at 3464 anti-symmetric and symmetric stretching vibrations of Si-O-Si groups are observed at characteristic bands at 1083 cm-1 and 804 cm-1, respectively [24].”
Functionalized KIT-6/Polysulfone Mixed Matrix Membranes for Enhanced CO2/CH4 Gas Separation DOI: 10.3390/polym12102312 -
信頼度 1.0
“ACS Omega http://pubs.acs.org/journal/acsodf Article P-O-P effect structure.20,29 synergistic of phosphorus, nitrogen, and silicon, the EP/ In addition, the characteristic absorpcm-1 TDA-5 sample presented a more compact and smooth char tio”
Fang 等 - 2021 - Synthesis of a Novel Flame Retardant Containing Ph DOI: 10.1021/acsomega.1c00076 -
Alkyl C-H 信頼度 1.0
“However, these peaks disappear cm-1, in the spectrum of the copolymer and a new peak appears at 804 representing the vibration of C-H in vicinity of C-S bond, and thus, confirming the utilization of C=C to form C-S bond meaning a copolymer”
A Degradable Inverse Vulcanized Copolymer as a Coating Material for Urea Produced under Optimized Conditions DOI: 10.3390/polym13224040 -
Silicon (Si) 信頼度 1.0
“cm-1 at 1086 due to the stretching vibration of Si-O-Si cm-1 and the peak at 804 is ascribed to the Si-C groups.”
Li 等 - 2018 - Thermal insulation of silica aerogelPMMA composit DOI: 10.1515/secm-2017-0248 -
C-S single bond 信頼度 1.0
“Combination of C-S stretching and S-N - 804 794 791 [39] asymmetric stretching mode of LiTFSI”
Liew 等 - 2016 - Poly(Acrylic acid)-Based Hybrid Inorganic-Organic DOI: 10.3390/polym8050179 -
Alkyl C-H 信頼度 1.0
“Finally, the bands 804 cm-1 cm-1 at 720 and 667 can be assigned to = C-H planar bending and C-O out of plane respectively.[31] bending, INTERNATIONAL JOURNAL OF FOOD PROPERTIES S2743”
Crude and refined oils from Elaeis guineensis: Facile characterization by FTIR and thermal analysis DOI: 10.1080/10942912.2017.1372470
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