Dinuclear Manganese(II,III,IV) Model Complexes for the Active Center of the Metalloprotein Photosystem II: Synthesis, Magnetism, and Crystal Structure of [LMnIII(μ‐O)(μ‐CH₃CO₂)₂MnIVL][ClO₄]₃(L = N,N′N″‐Trimethyl‐1,4,7‐triazacyclononane)

Systematic variation of the oxidation states between + II and + IV in an Mn2 Complex could be achieved with a μ-oxo/μ-hydroxo-bis(μ-carboxylato)dimanganesesystem. MnII, MnII-1,MnIIMnIII-,MnIII,MnIII-2,MnIII,MnIV-3,and MnIV,MnIV-complexes are electrochemically detectable. The mixed valent MnIII,MnIV-title complex 3 was characterized by X-ray structure analysis.