Synthesis, structure and magnetic properties of manganese(II) coordination polymer with 4,4′-[(5-carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid

A novel coordination polymer {[Mn2(L)4/3(H2O)3]⋅2H2O}n (1), was synthesized by the hydrothermal reaction of 4,4′-[(5-carboxy-1,3-phenylene)bis(oxy)]dibenzoic acid (H3L) with manganese(II) chloride tetrahydrate (MnCl2⋅4H2O) in an aqueous solution. The single X-ray diffraction indicated that the coordination polymer 1 had a three-dimensional (3D) framework. A trinuclear Mn unit is utilized as a building block connected via oxygen atoms of carboxylate group to form a two-dimensional layer structure. The interlayers connected by the ligands result in a 3D architecture. The coordination polymer 1 was characterized by the infrared spectroscopy, elemental analysis and powder XRD. According to magnetic susceptibility measurements the coordination polymer 1 can be characterized with the antiferromagnetic coupling interaction of J = −3.21 cm−1. Furthermore, the thermogravimetric analysis revealed good thermal stability for the coordination polymer 1.