A New Two-dimensional Zinc Coordination Polymer Constructed by 1,3-Bis(4-pyridyl)-propane and Terephthalate: Synthesis and Crystal Structure

A new zinc coordination polymer, [Zn-2(bpp)(tpa)(2)H2O] 1 (bpp = 1,3-bis(4-pyridyl)-propane and tpa = terephthalate) has been hydrothermally synthesized and characterized by elemental analysis, IR and single-crystal X-ray diffraction. X-ray crystal structure analysis reveals that complex 1 crystallizes in monoclinic, space group P2/c with a = 18.348(2), b = 10.9080(14), c = 13.7924(18) angstrom, beta = 98.156(2)degrees, V = 2732.5(6) angstrom(3), z = 4, C29H24N2O9Zn2, M-r = 675.24, Z = 4, F(000) = 1376, D-c = 1.641 mg/m(3), mu = 1.815 mm(-1), the final R = 0.0443 and wR = 0.0769 for 2715 observed reflections (I > 2 sigma(I)). The title complex exhibits a two-dimensional (4, 4) sheet structure which is further stacked through face-to-face pi-pi interactions between the monodentately coordinated pyridine ring of bpp ligand and the phenyl ring of terephthalate ligand to form a 3-dimensional supramolecular structure. Thermogravimetric analyses show that the host framework of the complex is thermally stable up to ca. 400 degrees C.