The novel double-ring octa-aza molecule (2) incorporates two copper(II) ions in aqueous solution with simultaneous release of four protons; the resulting dicopper(II) complex shows a weak metal–metal interaction and is easily oxidized to the trivalent state by two consecutive one-electron steps separated by 110 mV.
A. Buttafava, L. Fabbrizzi, A. Perotti and B. Seghi, J. Chem. Soc., Chem. Commun., 1982, 1166 DOI: 10.1039/C39820001166
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