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Updated: Sep 8, 2025

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合成カルボキシラート豊富なアリサイクリック分子によるLC/MS2比較分析による溶解有機物質の構造理解の強化

Jeffrey A Hawkes1, Agnes D Flygare1, Lindon W K Moodie2

  • 1Department of Chemistry BMC, Uppsala University, Uppsala 752 37, Sweden.

Analytical chemistry
|August 21, 2025
PubMed
まとめ

研究者らは,新しい類型を用いて複雑な溶解有機物質 (DOM) 構造を調査した. 多様な酸素機能により,DOMの断片化と化学組成に関する重要な洞察が明らかになり,既存のモデルに挑戦しました.

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NMR and Mass Spectroscopy of Carboxylic Acids

In ¹H NMR spectroscopy, acidic protons (–COOH) of carboxylic acids are highly deshielded and absorb far downfield, at around 9–12 ppm. The chemical shift value depends on the concentration and solvent used.
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Infrared spectroscopy is primarily used to determine the types of bonds and functional groups. In carboxylic acid derivatives, a typical carbonyl bond absorption is observed around 1650–1850 cm−1. For esters, the absorption is recorded at around 1740 cm−1, while acid halides show the absorption at about 1800 cm−1. Another acid derivative, the acid anhydrides, exhibit two carbonyl absorption around 1760 cm−1 and 1820 cm−1, arising from the symmetrical and...
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Mass spectrometry is an important technique for the identification of pure compounds. However, it has some limitations for the analysis of complex mixtures, often due to excessive fragmentation making the spectrum too complicated to decipher. Mass spectrometry can be combined with suitable separation methods in sequence, forming hyphenated methods, which are useful in the analysis of complex mixtures.
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IR and UV–Vis Spectroscopy of Carboxylic Acids01:28

IR and UV–Vis Spectroscopy of Carboxylic Acids

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