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Multinuclear magnetic resonance study of the coordination of aluminium(III) with tartaric acid in aqueous solution

✍ Scribed by Fokko R. Venema; Joop A. Peters; Herman van Bekkum

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 983 KB
Volume: 191
Category: Article
ISSN: 0020-1693
DOI: 10.1016/s0020-1693(00)93469-8

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✦ Synopsis

of The coordination of Al(II1) with (+)-(2R,3R)-tartaric acid in aqueous solutions at various pH values was investigated with the use of 'H, r3C, "0 and "Al NMR spectroscopy. High-field 27Al NMR revealed mononuclear l:l, 1:2, 1:3, and dinuclear 2:2 complexes with both octahedrally and tetrahedrally coordinated Al(II1). t3C and 27Al chemical shifts showed that deprotonation of the Al(II1) coordinated hydroxy groups of tartrate starts already at pH 1.5. The mononuclear 1:3 complex displayed a remarkable stability and symmetry, which is ascribed to the formation of successive hydrogen bonds. The stereospecitic formation of the AI(II1) complexes was investigated by comparison with rac-(2R,3R/2S,3S) and meso-(2R,3S)-tartaric acid.

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