Applet illustrates homogeneous interactions involving Zn2+, Mn2+ and some hypothetical ligand R −. For simplicity other charge-compensating anions are not shown.
Ligand has a strong affinity for complex formation with double-charged metal ions. However, preference of the ligand toward complex formation with zinc or manganese can be altered moving the slider attached to the applet.
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The preference to one or another ion can be altered moving the slider.