Mononuclear and Oligonuclear Manganese Complexes with Organic Multidentate Ligands

Abstract

The crystal structures of manganese complexes with tridentate, tetradentate, pentadentate, hexadentate, and dodecadentate ligands with oxygen and nitrogen donors are described. Reactions of these ligands with manganese salts afforded mononuclear (Mn^II, Mn^III, and Mn^IV), dinuclear (Mn^II₂, Mn^III₂, and Mn^IIMn^III), trinuclear (Mn^III₃), and tetranuclear (Mn^II₂Mn^III₂ and Mn^III₄) complexes. As for Mn^II complexes, octahedral, trigonal prismatic, capped trigonal prismatic, and square antiprismatic geometries were found depending on the combination of the organic and anionic ligands. In the case of Mn^III complexes, the Jahn-Teller distortions due to the high-spin d⁴ electronic configuration were observed as elongated or compressed octahedral geometries. An octahedral geometry was confirmed for the Mn (IV) complexes.