Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-08-08 DOI:10.1007/s10953-023-01319-7

Mayumi Etou, Toshifumi Taketatsu, Yoshihiro Okaue, Takanori Inoue, Takushi Yokoyama

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Abstract

The complexation between Al³⁺ ([Al(H₂O)₆]³⁺) and glycolic acid (GA, C₂H₄O₃) which has a carboxyl group and a hydroxyl group in a molecule was investigated under acidic condition using ²⁷Al NMR, ¹³C NMR and ESI–MS techniques. The five peaks including a peak due to Al³⁺ were observed in ²⁷Al NMR spectra for the mixed solution of Al³⁺ and GA, suggesting the existence of at least four Al-GA complexes. The results of NMR and ESI–MS measurements revealed that GA and Al³⁺ can form one monodentate complex (AlGA²⁺) and three bidentate complexes (AlGA⁺, AlGA₂⁻, and AlGA₃³⁻) complexes. From the deconvolution of ²⁷Al NMR spectra and pKa value of GA, the conditional formation constants (log₁₀ K) of each complex (GA/Al molar ratio of 25 in mixed solution) can be determined to be 0.94 (AlGA²⁺), − 0.96 (AlGA⁺), − 0.77 (AlGA₂⁻) and − 2.21 (AlGA₃³⁻), respectively. In addition, the overall formation constant of three bidentate complex at pH 3 was also calculated to be − 1.65.

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酸性条件下铝离子与乙醇酸的络合反应

使用27Al NMR、13C NMR和ESI–MS技术，在酸性条件下研究了Al3+（[Al（H2O）6]3+）与分子中具有羧基和羟基的乙醇酸（GA，C2H4O3）之间的络合作用。在Al3+和GA的混合溶液的27Al NMR光谱中观察到包括由Al3+引起的峰的五个峰，表明存在至少四个Al-GA络合物。NMR和ESI–MS测量结果表明，GA和Al3+可以形成一个单齿络合物（AlGA2+）和三个双齿络合物（AlGA+、AlGA2-和AlGA33-）。根据27Al NMR光谱和GA的pKa值的反卷积，可以确定每个络合物的条件形成常数（log10K）（混合溶液中GA/Al摩尔比为25）分别为0.94（AlGA2+）、−0.96（AlGA+）、−0.77（AlGA2-）和−2.21（AlGA33-）。此外，三个双齿配合物在pH值为3时的总形成常数也计算为−1.65。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.