SummaryThe formation of ternary complexes of the MAL 3-type [where M = Cu II , Ni I1 and ZnlI;A = nitrilotriacetic acid (~,ITA); L = 1-hydroxy-2-naphthoic acid (1,2 HNA) and 2-hydroxy-1-naphthoic acid (2,1 HNA)] have been studied potentiometrically in 50% v/v aqueous -ethanol (25 ° and/1 = 0.1). Under identical conditions the binary complexes of the 1,2-and 2,1-HNA ligands have also been examined. The values of mixed ligand formation constants KMA L have been found to be lower than KML (first step formation constant of binary complexes) and even less than KML 2 (second step formation constant of binary complexes).
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