Synthesis and characterization of an Fe(I) cage complex with high stability towards strong H-acids

The first synthesized and X-ray structurally characterized ‘‘classical’’ iron(I) dioximate showed an unrivaled stability towards strong acids, thus calling for a reassessment of the origins of the electrocatalytic activity of similar low-valent cobalt and iron cage complexes with electron-withdrawing ribbed substituents, shown previously to be effective electrocatalysts of the HER.