Mixed-solvothermal Synthesis, Crystal Structure and Luminescence of a New Dinuclear Yttrium(III) Coordination Polymer with 1-D Wave-like Infinite Chains

A new dinuclear Y3+ coordination polymer}[Y-2(H2O)(2)(C14H8O4)3(C12H8N2)(2)]center dot 3H(2)O}(n) (1, C14H8O4 = 2,2'-biphenyldicarboxylate, phen = 1,10-phenanthroline), has been obtained by means of a mixed-solvothermal method using ethylene glycol and water as solvent. The compound was characterized by elemental analysis, energy-dispersive X-ray spectroscopy (EDS), IR spectrum and single-crystal X-ray diffraction. The results reveal that 1 belongs to monoclinic system, space group C2/c with a = 24.249(3), b = 12.069(48), c = 22.7304(08) angstrom, beta = 113.480(7)degrees, Z = 4, V = 6102(2) angstrom(3), D-c = 1.462 g.cm(-3) , F(000) = 2728, mu = 1.968 mm(-1), the final R = 0.0673, wR = 0.1508 and S = 1.085. Its structure can be regarded as a 1-D coordination polymer constructed by Y3+ cations, 2,2'-biphenyldicarboxylate, 1,10-phenanthroline and water molecules. The compound not only contains two kinds of organic ligands, but also exhibits interesting wave-like infinite chains and 18-MR windows with the diameter of 4.070(7)angstrom x 5.326(9)angstrom. The structure is further stabilized by means of O-H center dot center dot center dot O hydrogen bonds and pi-pi stacking interactions. Furthermore, the luminescent properties (including emission spectrum, CIE chromaticity coordinate and decay curve) of 1 were also investigated in the solid-state at room temperature.