Hydrothermal Synthesis and Crystal Structure of a Manganese(II) Coordination Polymer with 1,1′-Biphenyl-2,2′,6,6′-tetracarboxyl Acid and 2,2′:6,2"-Terpyridine Ligands

The title compound {[Mn(H2BPTC)(tpy)(H2O)]center dot(H2O)(3)}(n) (1, H4BPTC = 1,1'-biphenyl-2,2',6,6'-tetracarboxylic acid, tby = 2,2':6,2 ''-terpyridine) has been synthesized by the hydrothermal reaction, and its structure was determined by X-ray diffraction and characterized by elemental analysis, IR spectrum and thermogravimetric analysis. The crystal is of monoclinic, space group P2(1)/c with a = 10.971(2), b = 20.776(4), c = 14.332(3) angstrom, beta = 109.25(3)degrees, MnC31H27N3O12, M-r = 688.50, V = 3084.1(10) angstrom(3), D-c = 1.483 g/cm(3), F(000) = 1420, mu = 0.498 mm(-1), S = 1.066 and Z = 4. The final refinement gave R = 0.0447 and wR = 0.1103 for 5107 observed reflections with I > 2 sigma(I). The title complex has a {[Mn(H2BPTC)(tpy)(H2O)]}(n) chain structure, and the hydrogen bonding interactions make it more stable. Each chain is further connected to the adjacent ones through pi center dot center dot center dot pi, C-H center dot center dot center dot pi and rich hydrogen bonds to form a metal-organic coordination polymer.