Synthesis, crystal structure, spectroscopic, and magnetic properties of a manganese(II) methoxyacetate complex [Mn(C6O6H10)(H2O)]n

A metal-organic coordination polymer, [Mn(C6O6H10)(H2O)]n (1), has been synthesized and characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction. Thermogravimetric analysis and EPR spectrum of the compound have also been studied. Light pink crystals of the complex are monoclinic, space group P21/c, with a = 7.9444(16) angstrom, b = 9.0802(18) angstrom, c = 13.142(3) angstrom, = 93.53(3)degrees, V = 946.2(3) angstrom 3, Z = 4, and R1 = 0.0212. The compound is mononuclear and contains six-coordinate ions bound to bi- and tridentate methoxyacetate molecules and water. Each manganese ion is connected with the neighboring manganese via carboxylate bridges forming a polymeric chain of [Mn(C6O6H10)]n and water. The 1-D manganese polymer chains are further hydrogen-bonded via the carboxyl groups and water to produce a 3-D extended network. The FT-IR spectrum from 4000 to 400 cm-1 region confirms the bonding of water. Decomposition reaction takes place in the temperature range 25-900 degrees C in nitrogen. The temperature dependence of magnetic susceptibility reveals weak antiferromagnetic coupling interaction (J = -0.74 cm-1) between the Mn(II) sites.