Synthesis, structure, and magnetism of three manganese-organic framework with PtS topology

Abstract

Three 3D manganese-organic frameworks, Mn2(BPTC)(DMF)2(H2O)·DMF·3H2O (1), Mn2(BPTC)(bipy)(DMF)·DMF·H2O (2), and Mn2(BPTC)(phen)(DMF)·EtOH (3), have been solvothermally synthesized using 3,3′,5,5′-biphenyltetracarboxylic acid (H4BPTC). All complexes are characterized by PXRD, EA, IR and TG. The results show that they all bear the PtS topology with (42.84) (42.84) for the vertex symbols of the planar and tetrahedral nodes, in which the BPTC ligand is considered as a square-planar 4-connected linker, and every binuclear SBU connected to the four BPTC ligands is simplified into tetrahedral 4-connected nodes. Because the three coordination sites of one metal center of SBU are occupied by the coordinated solvent molecules, complex 1 exhibits low stability. After substituting 2,2′-bipy or 1,10-phen for two coordinated solvent molecules, complexes 2 and 3 display evidently higher structure stability. The magnetism property of complex 2 is also discussed in detail.