One New Zinc Coordination Polymer Based on 2-Chloro-benzoate and 4,4′-Bipyridine: Synthesis, Crystal Structure and Luminescence

A Zn-based coordination polymer [Zn(2-cb)(2)(4,4'-bpy)(0.5)]n, (1, 2-cb = 2-chlorobenzoate, 4,4'-bpy = 4,4'-bipyridine) was prepared by hydrothermal synthesis using 2-chlorobenzoic acid and 4,4'-bipyridyl as ligands. The compound was characterized by elemental analysis, IR, TGA, and X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group P (1) over bar with a = 8.0471(5), b = 9.7338(6), c = 11.7830(7) angstrom, alpha = 96.2230(10), beta = 92.542(2), gamma = 103.7560(10)degrees, V = 888.84(9) angstrom(3), Z = 2, M-r = 454.57, D-c = 1.698 g/cm(3), mu(MoK alpha) = 1.708 mm(-1), F(000) = 458; the final R = 0.0359 and wR = 0.0936 for 3167 observed reflections with I > 2 sigma(I). The crystal analysis indicates that 1 exhibits a 1-D chain structure constructed by 4,4'-bpy and a dicaryon secondary-building-unit of [Zn-2(2-cb)(4)]. Luminescence analysis revealed that compound 1 emits blue fluorescence with a fluorescence lifetime of 55.03 ns.