What absorbs at 2140 cm⁻¹ in an FTIR spectrum?
A band near 2140 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 2140 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 |
|---|---|---|---|
| Hydroxyl (O-H) | 4 | 4 | 1.0 |
| Adsorbed carbon monoxide | 2 | 1 | 1.0 |
| C#c | 1 | 1 | 1.0 |
| C c single bond | 1 | 1 | 1.0 |
| Silicon hydride | 1 | 1 | 1.0 |
| Water (H2O) | 1 | 1 | 1.0 |
| Alkyl C-H | 1 | 0 | 1.0 |
| Nitrile | 1 | 0 | 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 |
|---|---|---|---|
| AgNPs | 2140, 1232, 1048 | Hydroxyl (O-H) | 1 |
| silver nanoparticles | 2140, 1636, 1631 | Hydroxyl (O-H) | 1 |
| zeolite | 2140, 1013, 1245 | Hydroxyl (O-H), Adsorbed carbon monoxide | 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 2140 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
-
Hydroxyl (O-H) 信頼度 1.0
“N-D identified that the stretching vibrations of the Schiff X-D most spectral changes in the stretching vibrations cm-1 (32) base in BR and ppR are located at 2171 and 2123 O-D N-D originate from either a water stretch or a stretch cm-1 and”
Ota 等 - 2006 - Structural changes in the Schiff base region of sq DOI: 10.1021/bi051937l -
Hydroxyl (O-H) 信頼度 1.0
“Physisorbed CO results in a band at 2140 cm-1, whereas CO interacting with surface OH groups gives rise to a band at 2155 while cm-1 cm-1 another massif from 2180 to 2245 accounts for CO interacting with Lewis cm-1”
Upgrading the PtCu intermetallic compounds: The role of Pt and Cu in the alloy DOI: 10.1016/j.cattod.2019.11.026 -
Silicon hydride 信頼度 1.0
“Whereas the decrease in the CH bands intensities and the simultaneous 3 cm-1 increase of the Si-H absorption band intensity at 2140 at higher W/F values (hard plasma conditions), is due to the higher monomer fragmentation.”
Comparative study of bulk and surface compositions of plasma polymerized organosilicon thin films DOI: 10.1002/ppap.201900024. -
Hydroxyl (O-H) 信頼度 1.0
“cm-1 and interaction with Here, the strong broadband centered at around 3291 and weak band at cm-1 around 2140 are ascribed to the inter molecular hydrogen bonded network formed by the hydroxyl groups”
Bioinspired 5-caffeoylquinic acid capped silver nanoparticles using Coffee arabica leaf extract for high-sensitive cysteine detection DOI: 10.1038/s41598-023-34944-9 -
信頼度 1.0
“Based on our previous studies supported by DFT calculations [8,11], we assign the cm-1 2127 band to Pd(II)(OH)(CO) complex (or alternatively Pd(II)(CO) complex: we cannot cm-1 exclude either assignment at present) and the 2140 band to a dif”
The superior hydrothermal stability of Pd/SSZ-39 in low temperature passive NOx adsorption (PNA) and methane combustion DOI: 10.1016/j.jcat.2010.07.031. -
C c single bond 信頼度 1.0
“LLM confirmed rule peak-group candidate”
Microsoft Word - Rapid_synthesis_of_nanocrystalline_YAG_via_microwave_assisted_solvothermal_process_final_resubmit_jbBV (1) DOI: 10.1111/jace.15815 -
Adsorbed carbon monoxide 信頼度 1.0
“cm-1, bands of carbon dioxide at 2317 and 3728 cm-1, the rotovibrational band due to CO deformation at bands of carbon dioxide at 2317 and 3728 the rotovibrational band due to CO deformation at 2 2 cm-1, cm-1), 771 the rotovibrational band”
Thermocatalytic Pyrolysis of Exhausted Arthrospira platensis Biomass after Protein or Lipid Recovery DOI: 10.3390/en13205246 -
C#c 信頼度 1.0
“Also, a small stretch at 2140 was found, which can be assigned to alkyne Apart cm-1 from this, a very sharp and intense peak was obtained at 1650 for C=O stretch representing α, β unsaturated cm-1 aldehydes and ketones.”
Comparative assessment of green and chemically synthesized glutathione capped silver nanoparticles for antioxidant, mosquito larvicidal and eco-toxicological activities DOI: 10.1038/s41598-023-35249-7
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