The [Mn(μ‐O)(μ‐PhBO₂)₂]²⁺ Unit: A New Structural Model for Manganese‐Containing Metalloproteins

Abstract

By employing boronato instead of carboxylato bridges in the dication [Mn (μ‐O)‐(μ‐PhBO 2 ) 2 L 2 ] 2+ (L = 1,4,7‐trimethyl‐1,4,7‐triazacyclononane), a Mn unit has been stabilized for the first time. Together with the di‐μ‐carboxylato‐μ‐oxodimanganese complexes of analogous structure, there is now an “isostructural series” available containing Mn , Mn II Mn III , Mn , Mn III Mn IV , Mn units. The Mn K‐edge energy of the corresponding complexes increases linearly with increasing oxidation level. This is of importance for EXAFS investigations of metalloproteins containing manganese.