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Macrocyclic tetraglycinate complex 1-EuII; the EuII aqua ion, EuCl2(aq); and the 4-fluorobenzo-functionalized complex 2-EuII. Inner-sphere water and counterions have been omitted for clarity. Reported E1/2 values are versus normal hydrogen electrode and are below 1-EuII,[7], EuCl2(aq),[17] and 2-EuII.[17]
