A unique manganese (II) 2D polymer containing 2, 5-di(2′,4′-dicarboxylphenyl) pyridine and oxalate mixed ligands: Structure and magnetic property

• A novel MnII polymer containing both the ddpp and oxalate auxiliary ligand has been synthesized.
• Oxalate ligand acts as both bidentate and chelating ligand linking two asymmetric units into tetranuclear MnII cluster.
• Combined biphenyl tetracarboxylic acid acts as a linker for construction of 2D coordination polymer.
• It displays high thermal stability and weak antiferromagnetic interactions between adjacent MnII ions.

Solvothermal reaction of conjugated pyridine/benzene dicarboxylic acid ligand with manganese acetate in the presence of ammonium oxalate afforded a novel 2D polymer, {[Mn4(ddpp)2 (μ4-C2O4)·6H2O]·2H2O}n (ddpp = 2, 5-di(2′,4′-dicarboxylphenyl) pyridine) (1). It has been characterized by element analysis, thermogravimetry, infrared spectroscopy and single-crystal X-ray diffraction studies. Polymer 1 is constructed from tetranuclear MnII clusters through oxalate bridging, in which four adjacent MnII ions are linked into a parallelogram-core aggregate, and the polymer 1 exhibits 1D double-zigzag chains bearing a ladder-like topology feature. The ddpp ligands further interconnect these 1D double chains into 2D corrugated-shape network. Variable temperature magnetic susceptibility measurements indicate that polymer 1 exhibits weak antiferromagnetic interactions.

A novel MnII polymer containing both the ddpp and oxalate auxiliary ligand has been synthesized. It displays high thermal stability and weak antiferromagnetic interactions between adjacent MnII ions.Figure optionsDownload as PowerPoint slide