Abstract
Copper(II) and nickel(II) complexes of 2-amino-2-(hydroxymethyl)-1,3-propanediol have been studied in aqueous solution at 25° and at an ionic strength of 0·10 M. The equilibrium constants for the various species present in solution have been determined from potentiometric measurements of hydrogen ion concentration. With both metal ions, the “ordinary” complexes of the neutral ligand, which first formed, undergo further dissociation as the pH is increased, forming polynuclear chelates in which alcoholate groups are probably involved in metal ion coordination. With copper(II), no polynuclear complexes are formed in the presence of excess ligand. On the other hand, nickel(II) forms polynuclear species even in the presence of excess ligand.
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