関連する実験動画

Updated: Apr 26, 2026

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Qualitative Identification of Carboxylic Acids, Boronic Acids, and Amines Using Cruciform Fluorophores

Published on: August 19, 2013

19F NMR指紋:分子容器内の中性有機化合物の識別

Yanchuan Zhao¹, Georgios Markopoulos, Timothy M Swager

¹Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society

|July 23, 2014

まとめ

新しい方法は,フッ素-19 NMR (19F NMR) と分子容器を使用して,中性有機分子に"指紋"を付ける. この技術は,複雑な混合物の中の複数の化合物,たとえ構造が似ているものであっても,同時に正確に識別することを可能にします.

科学分野:

アナリティカル・ケミストリー (Analytical Chemistry) とは
有機化学オーガニック・ケミストリー
スペクトル顕微鏡検査です.

背景:

中性有機化合物の正確な識別は,様々な科学分野において極めて重要です.
類似の化学構造を持つ分析物質を区別することは,分析上の大きな課題です.
既存の方法には,複雑な混合物に必要な速度や精度が欠けている可能性があります.

研究の目的:

ニュートラルな有機分子に指紋を付けるための新しい,迅速で正確な方法を開発する.
密接に関連した化学構造を持つ分析物の微分を可能にする.
複雑なサンプルマトリックス内の複数の化合物の同時識別を容易にする.

主な方法:

フッ素-19による核磁気共鳴 (19F NMR) スペクトロスコピーを利用する.
分析剤の選択的封じ込みをするために分子容器を使用します.
分析剤のカプセル化によって誘発される (19) F共鳴の特徴的シフトを分析する.
複数のフッ素受容体配列または複数のフッ素原子を持つ単一の受容体で戦略を実行する.

主要な成果:

封じ込めは,多次元指紋として機能する (19) F NMR共鳴において,ユニークな上場または下場シフトを誘導します.
分析物とフッ素原子の近接は,顕著なNMRシフトと構造的差異化に不可欠である.
この方法は,類似の構造を持つ分析物を成功裏に差別化します.
複雑な混合物における複数の分析物の正確な同時識別が達成されました.

結論:

開発された (19) F NMRと分子容器アプローチは,分子指紋の有効な戦略を提供します.
この技術は,中性有機化合物の迅速かつ正確な識別のための強力なツールを提供します.
この方法は,複雑な化学混合物を分析し,構造的に類似した分子を区別するための大きな可能性を示しています.

さらに関連する動画

A New Straightforward Method for Lipophilicity logP Measurement using 19F NMR Spectroscopy

A New Straightforward Method for Lipophilicity logP Measurement using 19F NMR Spectroscopy

Published on: January 30, 2019

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Single-throughput Complementary High-resolution Analytical Techniques for Characterizing Complex Natural Organic Matter Mixtures

Published on: January 7, 2019

関連する概念動画

IR Frequency Region: Fingerprint Region

IR Frequency Region: Fingerprint Region

IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...

NMR Spectroscopy of Aromatic Compounds

NMR Spectroscopy of Aromatic Compounds

Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

Mass Spectrum: Interpretation

Mass Spectrum: Interpretation

An unknown compound can be established by identifying the molecular ion peak in the mass spectrum. The molecular ion peak is often weak or absent due to the predominance of fragmentation in high-energy electron beams. In such cases, a soft-energy electron beam can be used to scan the spectrum to enhance the intensity of the molecular ion peak. Additionally, chemical ionization, field ionization, and desorption ionization spectra are used to obtain a relatively intense molecular ion peak.To...

¹H NMR of Labile Protons: Temporal Resolution

¹H NMR of Labile Protons: Temporal Resolution

Protons bonded to heteroatoms such as nitrogen and oxygen exhibit a range of chemical shift values. This is due to the varying degree of hydrogen bonding between the proton and the heteroatom in other molecules. The extent of hydrogen bonding affects the electron density around the proton, thereby giving different chemical shift values for the protons in the proton NMR spectrum.
The –OH proton in alcohols typically appears in the range of δ 2 to 5 ppm but can vary depending on the...

¹H NMR: Complex Splitting

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...