Synthesis, characterization and redox reactivity of l-tartrato bridged dinuclear manganese complex with 2,2′-bipyridine

A new l-tartrato manganese(III) complex was synthesized and characterized as the dinuclear dimanganese(III) structure with a stereospefically formed [Λ–Λ] absolute configuration around Mn(III) ions. The thermal and photo decomposition gave the first example of dihydrogen gas evolution besides CO and CO2 gas associated with cis-[MnII(ox)(bpy)(H2O)2]. A proposed redox reaction proceeds from Mn(III) to Mn(II) via intermediate Mn(IV) and Mn(II) with CO anion radical species followed by oxidation of tartrate ligands.