Ternary complexes in solution. Comparison of the coordination tendency of some polybasic oxygen acids toward the binary complexes of copper(II) and adenosine 5'-mono-, 5'-di-, and 5'-triphosphate

Abstract

Potentiometric equilibrium measurements have been made at (25±0.1) o C and ionic strength I=0.1 mol dm -3 KNO 3 for the interaction of adenosine 5' mono-, 5'-di-, and 5'-triphosphate (AMP, ADP, and ATP) and Cu(II) with biologically important secondary ligand acids (malic, maleic, succinic, tartaric, and oxalic acids) in a 1:1:1 ratio and the formation of various 1:1:1 mixed ligand complex species inferred from the potentiometric pH titration curves. Initial estimates of the formation constants of the resulting species and the acid dissociation constants of AMP, ADP, ATP, and secondary ligand acid have been refined with the SUPERQUAD computer program