Question

Coordination of some transitionmetalion complexes in tartaric acid rt

Answer 1

The reactions of the Al(III) ion with citric acid, tartaric acid, gluconic acid, saccharic acid, glyceric acid, bis(hydroxyethyl)glycine, and catechol were studied by potentiometric methods. The equilibrium data were processed with the Fortran computer program BEST. By taking into account all of the known hydrolytic aluminum(III) species, problems associated with previous investigations were avoided. Detailed computations at various ratios of ligands to aluminum(III) now provide a comprehensive description of the Al(III) complexes formed in solution, and formation constants are reported for the various complex species involved. It was found that Al(III) has a very strong tendency toward displacement of protons from the hydroxyl groups of hydroxy acids, a property that previously has not been fully recognized.