Multinuclear-magnetic-resonance study of the coordination of aluminium (III)-aldarate complexes with calcium(II) in aqueous solution

✍ Scribed by F. R. Venema; J. A. Peters; H. van Bekkum

• Book ID: 104589546
• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 609 KB
• Volume: 112
• Category: Article
• ISSN: 0165-0513
• DOI: 10.1002/recl.19931120703

✦ Synopsis

Abstract

The coordination of aluminium(III)‐aldarate complexes with calcium(II) in aqueous solution has been investigated with the use of ^1^H‐, ^13^C‐, ^17^O‐, and ^27^Al‐NMR spectroscopy. Xylarate and mannarate adopt, in the presence of Al^III^ and Ca^II^, 1:2 Al^III^‐ligand complexes with tetrahedrally coordinated Al^III^. The Al^III^‐xylarate complex binds one, whereas the mannarate complex binds two Ca^II^ ions. Arabinarate and glucarate give 2:2 Al^III^‐ligand complexes with tetrahedrally coordinated Al^III^, which bind one and two Ca^II^ ions, respectively. The Ca^II^ sites of all the complexes contain free carboxylate groups and, additionally, Al^III^‐bonded (hydr)oxy or free α‐hydroxy groups.