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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The measurement of ESI-MS was made at the Institute of Chemical Materials and Engineering, Kyushu University.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by ME and TT. The first draft of the manuscript was written by ME and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Etou, M., Taketatsu, T., Okaue, Y. et al. Complexation Between Aluminum Ion and Glycolic Acid Under Acidic Condition. J Solution Chem 52, 1318–1328 (2023). https://doi.org/10.1007/s10953-023-01319-7
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DOI: https://doi.org/10.1007/s10953-023-01319-7