Abstract
The behaviour of solutions containing 3-( N-tris[hydroxymethyl]methylamine)-2-hydroxypropanesulfonic acid (TAPSO) and copper(II) was studied by two analytical techniques, direct current polarography (DCP) and glass electrode potentiometry (GEP), at fixed total TAPSO to total copper(II) concentration ratios and various pH values, at 25 °C and ionic strength 0.1 M KNO 3. DCP and GEP, when used independently, were not able to provide a final metal–ligand model. Combined interpretation of data from DCP and GEP indicated the formation of six main species, CuL +, CuL(OH), CuL(OH) 2 −, CuL 2, CuL 2(OH) − and CuL 2(OH) 2 2− for which stability constants (as log β) were found to be 4.41, 11.43, 17.55, 8.08, 14.3 and 20.3, respectively. Five of these complexes, CuL(OH), CuL(OH) 2 −, CuL 2, CuL 2(OH) − and CuL 2 (OH) 2 2− are reported for the first time.
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