Manganese(II)-promoted ligand oxidation during the formation of a coordination polymer

During the synthesis of Mn(II) compounds from fluorene-2,7-dicarboxylate, the ligand undergoes in situ oxidation to generate a Mn(II) coordination polymer with the ligand fluorenone-2,7-dicarboxylate (FODC2 −). It was demonstrated that the transformation occurs with dioxygen as reactant and Mn(II) as catalyst. The resulting coordination polymer, [Mn3(FODC)3(DMA)4]⋅2.5DMA, displays a 2D network based on the [Mn3(COO)6(DMA)4] unit with triple carboxylate bridges. Magnetic analyses were performed not only on temperature-variable susceptibility but also on field-variable magnetization, indicating weak antiferromagnetic interactions through the triple bridges.