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The macrocyclic proligand [H4L][OTf]2, which contains four carboxamide functions and two conjugated pyridinium groups, is easily deprotonated by the weak base sodium acetate to give the corresponding neutral proligand [H2L]. Metallation of [H2L] with iron(II) chloride proceeds rapidly to form the macrocyclic complex, [FeIIICl(L)]. This is an effective catalyst for the oxidation of the organic dye...
The depicted macrocyclic iron complex is a highly active, biomimetic oxidation catalyst in water at pH 7. The iron centre is coordinated by four unique, hybrid, pyridinium amidate/amidate nitrogen donors. Upon activation by the green oxidant hydrogen peroxide, the iron complex is converted to an aggressive intermediate (represented by the piranha) that very rapidly oxidises the surrogate pollutant...
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