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Time-Dependent Solution Speciation of the AlIII−Citrate System: Potentiometric and NMR Studies

✍ Scribed by Andrea Lakatos; István Bányai; Patrick Decock; Tamás Kiss

Publisher: John Wiley and Sons
Year: 2001
Tongue: English
Weight: 442 KB
Volume: 2001
Category: Article
ISSN: 1434-1948
DOI: 10.1002/1099-0682(200102)2001:2<461::aid-ejic461>3.0.co;2-e

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✦ Synopsis

Time-dependent potentiometric and NMR spectroscopic measurements were carried out in the Al III -citric acid system in an equimolar solution and at an excess of ligand in order to monitor the changes in speciation as a function of time. In fresh solutions, the mononuclear 1:

and [AlL 2 H -2 ] 5-are formed. In agreement with earlier findings (Inorg. Chem. 1988, 27, 2565), these complexes are converted to a large extent into a thermodynamically more stable trinuclear species as the solutions age. Depending on the composition of the initially formed mono-

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