Preparation, Crystal Structure and Thermal Behaviour of a One-dimensional Coordination Polymer [Mn（m-CPOAH）2（H2O）2]n

The coordination polymer of [Mn(m-CPOAH)2(H2O)2]n (m-CPOAH– = 3-carboxyl- phenoxyacetate) has been synthesized and characterized by elemental analyses, IR, TG and single- crystal X-ray diffraction. The title complex crystallizes in the triclinic system, space group P1 with a = 4.7013(9), b = 5.6822(11), c = 17.758(4) ?, α = 87.39(3), β = 85.39(3), γ = 85.76(3)o, V = 471.18(17) ?3, Z = 1, Mr = 481.26, Dc = 1.696 g/cm3, μ = 0.770 mm-1, F(000) = 247, R = 0.0385 and wR = 0.1015. The Mn(II) atom assumes a distorted octahedral geometry, involving four carboxyl oxygen atoms from different m-CPOAH– ligands and two coordinated water molecules. The Mn(II) atoms are linked by the m-CPOAH– ligand to form a one-dimensional chain structure along the a axis. The shortest Mn…Mn separation within the polymer is 7.401(4) ?. A three- dimensional supramolecular network is constructed by O–H…O hydrogen bonding interactions.