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Studies on complex species of aluminium with aminocarboxylic acids by 27 Al NMR spectroscopy
Author(s) -
Karweer S. B.,
Pillai B. P.,
Iyer R. K.
Publication year - 1990
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260281103
Subject(s) - chemistry , picolinic acid , hydrolysis , potentiometric titration , nuclear magnetic resonance spectroscopy , ligand (biochemistry) , dissociation (chemistry) , medicinal chemistry , inorganic chemistry , ion , stereochemistry , organic chemistry , biochemistry , receptor
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.