The stability constants and thermodynamic functions involved in the formation of Mo(VI) and U(VI) chelates with dl-alpha-aminobutyric acid have been determined potentiometrically. It is observed that in the case of Mo(VI) system three chelates ML, ML(2) and ML(3) are formed stepwise, whereas in the U(VI) system only two chelates ML and ML(2) are formed before precipitation occurs, and both steps occur almost simultaneously. Results show that entropy makes a predominant contribution to the stability of both Mo(VI) and U(VI) chelates.
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