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Studies on complex species of aluminium with aminocarboxylic acids by 27Al NMR spectroscopy

✍ Scribed by S. B. Karweer; B. P. Pillai; R. K. Iyer

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
214 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The reactions of Al^3+^ ion with glycine, picolinic acid, 1,2‐propylenediaminetetraacetic acid and triethylenetetra‐minehexaacetic acid (H~p~L) were studied by potentiometric and ^27^Al NMR methods, and the complex species in solution at different pH values were identified. Acidic hydrolysis of the Al‐PDTA complex results in the formation of [AIL]^−^, [Al(H~2~O)LH] and [Al(H~2~O)~2~LH~2~]^+^ prior to dissociation, while base hydrolysis takes place through the monohydroxo species. Although TTHA is a decadentate ligand, the maximum number of donor sites utilized in the formation of the 1:1 Al‐TTHA complex is only five.

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