Accessing three oxidation states of cobalt in M₆L₃ nanoprisms with cobalt-porphyrin walls

Nanocages with porphyrin walls are common, but studies of such structures hosting redox-active metals are rare. Pt²⁺-linked M₆L₃ nanoprisms with cobalt-porphyrin walls were prepared and their redox properties were evaluated electrochemically and chemically, leading to the first time that cobalt-porphyrin nanocages have been characterized in Co^I, Co^II, and Co^III states.