Fig. 3: Experimentally measured pKa values and calculated H2O/OH− energy differences of hexa-aqua metal complexes.
From: pKa of the ligand water molecules in the oxygen-evolving Mn4CaO5 cluster in photosystem II
Blue open circles for divalent (II) metals, green open squares for trivalent (III) metals, and red closed diamond for the tetravalent (IV) metal.
