What absorbs at 727 cm⁻¹ in an FTIR spectrum?
A band near 727 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 7 cited sources
Quick answer
A band near 727 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 | 3 | 3 | 1.0 |
| Alkene (C=C) | 2 | 2 | 1.0 |
| Metal oxygen | 2 | 2 | 1.0 |
| Ring structure | 1 | 1 | 1.0 |
| Aromatic ring | 1 | 1 | 1.0 |
| Secondary amine | 1 | 1 | 1.0 |
| C n single bond | 1 | 1 | 1.0 |
| Amide | 1 | 1 | 1.0 |
| N h | 1 | 1 | 1.0 |
| Carbonate | 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。
Possible materials
| 素材 | 補助ピーク | Overlapping groups | 引用元 |
|---|---|---|---|
| Silver Nanoparticles | 727, 1636, 1631 | Alkyl C-H | 1 |
Materials are shown only when the same literature pool supports this band and at least one additional characteristic peak.
Spectrum logic
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 727 cm⁻¹ is usually not enough for material identification by itself.
Real-world usage
This type of query is common in polymer identification, unknown plastic screening, QC troubleshooting, recycled-material verification, and literature-backed peak assignment review.
Common mistakes
- Treating one isolated band as proof of a material without checking at least one or two supporting peaks.
- Ignoring overlap: multiple functional groups can contribute near the same wavenumber.
- Skipping validation when additives, blends, oxidation, or contamination may distort the spectrum.
Verification advice
When ambiguity remains, validate the hypothesis with DSC, GC-MS, or TGA, especially for blends, degraded samples, and filled polymers.
これらのアサインの根拠となる文献
-
Alkyl C-H 信頼度 1.0
“aromatic group in strong (C-H bend stretch, aliphatic amines group in medium (C-N stretch, 1055.96, 1038.12cm-1), alkenes group in strong (C-H rock, 981.81, 726.78cm-1), and alkyl halides group in medium (C-Br 567.83cm-1).”
Baranitharan 等 - 2022 - Fabrication of Silver Nanoparticles Using Fimbrist DOI: 10.1155/2022/4083663 -
Metal oxygen 信頼度 1.0
“856 0.47 0.59 Al-O stretching 727 0.5 0.6 653 0.5 0.6 Table 5: DRIFT bands that are characterizing coated and bonded”
El-Naggar - 2013 - Characterization of Modified and Polymer Coated Al DOI: 10.1155/2013/706960 -
Aromatic ring 信頼度 1.0
“Weaker bands at 727, 1022, and 1413 assigned to aromatic CH out of plane bending, aromatic CH in-plane”
Binational survey of personal protective equipment (PPE) pollution driven by the COVID-19 pandemic in coastal environments: Abundance, distribution, and analytical characterization DOI: 10.1016/j.jhazmat.2021.128070 -
Metal oxygen 信頼度 1.0
“LLM confirmed rule peak-group candidate”
Effect of aluminum fluoride complexation on fluoride removal by coagulation DOI: 10.1016/j.colsurfa.2011.12.010 -
Alkene (C=C) 信頼度 1.0
“The weak absorption peak at 727 belongs to the rocking double bonds.”
Characterization of the Materials and Techniques of Red Lacquer Painting of a Horizontal Plaque Inscribed by General Feng Yü-hsiang DOI: 10.3390/coatings13030583 -
Carbonate 信頼度 0.9
“Assigned to out-of-plane bending (ν4) of CO32-.”
Reyes 等 - 2021 - Kinetics of the Thermal Decomposition of Rhodochro DOI: 10.3390/min11010034 -
信頼度 0.9
“in-plane bending vibration CO at 750 and 727”
Zhang 等 - 2019 - A Micro-Scale Investigation of the Adsorption of C DOI: 10.1007/s42461-019-00118-3
このバンドを持つスペクトルがありますか？
FTIRスペクトルをアップロードすると、数秒で完全な解釈レポート（文献引用付きピークアサイン、ライブラリマッチ、信頼度評価付き証拠チェーン）を取得できます。