Abstract
Aqueous solutions containing quinolinic acid (2,3-pyridinedicarboxylic acid) and aluminum chloride were investigated using attenuated total reflection Fourier transform infrared spectroscopy, 27Al nuclear magnetic resonance spectroscopy ( 27Al NMR), and potentiometry. Conditional equilibrium constants were acquired at an apparent ionic strength of 1.33 M for the formation of quinolinic acid (H 2L), the HL − species, and each of the Al(III)–quinolinate complexes (AlL + and AlL 2 − ). The resolved infrared spectra of the quinolinate ion (L 2−), the HL − species, and quinolinic acid were assigned and interpreted with respect to the proton binding properties of the ligand. The assignments of the 27Al NMR and infrared spectra of the Al(III)–quinolinate complexes provide evidence that quinolinate preferentially chelates to Al(III) through both the nitrogen of the pyridine ring and one of the oxygens of a carboxylate substituent.
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