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, [Mn-3(FODC)(3)(DMA)(4)]center dot 2.5DMA, displays a 2D network based on the [Mn-3(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. (c) 2013 Elsevier B.V. All rights reserved.