Synthesis, structure and catalase activity of the [TPA2Mn2(μ-Cl)2]2+ complex

The dinuclear Mn complex (Et3NH)2[TPA2Mn2(μ-Cl)2](ClO4)4 (I) was synthesized and characterized. The [Mn2(μ-Cl)2]2+ core, with a Mn-Mn distance of 3.521(2) Å, is similar to the active site found in chloride-inhibited Mn catalase. EPR and temperature-dependent magnetic susceptibility measurements of complex I showed an antiferromagnetic interaction between the two S = 5/2 Mn centers.