Synthesis, structure and properties of copper(II) and manganese(II) coordination polymers with l,5-dinitronaphthalene-3,7-dicarboxylate

Two new metal-organic coordination polymers with l,5-dinitronaphthalene-3, 7-dicarboxylate (NNDC), [Cu₂(NNDC)₂(DMF), _1.8(DMSO)_2.2(H₂O)₂]-H₂O (1) and [Mn₃(NNDC)₃(DMSO)₄]DMSO (2) have been synthesized under solvothermal conditions and characterized by single crystal X-ray diffraction and Thermogravimetric Analysis (TGA). The structure of compound 1 consists of one-dimensional chains with copper ions being linked by the dicarboxylate ligands. The coordination chains are associated into ladder-like double chains through O-H&O hydrogen bonds and Tt-Jt interactions, and the ladders are packed in a cross fashion through further n-n interactions to give the three-dimensional structure. The Mn(II) compound exhibits a 3D framework with the peu topology, in which [Mn₃(COO) _e] clusters as octahedral secondary building blocks are linked by the naphthalene spacers. Magnetic analyses were carried out based on both temperature- and field-dependent data, consistently suggesting relatively weak antiferromagnetic interactions within the carboxylate bridged [Mn ₃(COO)₆] cluster.