КООРДИНАЦИОННАЯ ХИМИЯ, 2017, том 43, № 3, с. 164–170 УДК 541.49 TWO NEW CADMIUM COORDINATION POLYMERS BASED ON C2 SYMMETRICAL PENTA-CARBOXYLATE TECTONIC: SYNTHESIS, STRUCTURES, AND FLUORESCENT PROPERTIES © 2017 P. Tang1, 2 , G. X. Wen1 , X. Q. Wu1 , Z. H. Zhou1 , X. Ye1 , and D. S. Li1, * 1College of Materials and Chemical Engineering, Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, China Three Gorges University, Yichang, 443002 P.R China 2College of Biology & Pharmaceutics, China Three Gorges University, Yichang, 443002 P.R. China *e-mail: lidongsheng1@126.com Received February 2, 2016 Complex II features a trinodal (4,5,6)-connected 3D network with a (4.5.64)2(42.52.64.72)2(42.54.62.72.85) topology with alternate binuclear metal clusters and single metal centres. <...> Complex I exhibits a uninodal 5-connected bnn net with a (46.64) topology based on binuclear metal clusters as nodes. <...> Keywords: Cd(II) coordination polymer, crystal structure, topology, fluorescent properties DOI: 10.7868/S0132344X17030082 INTRODUCTION The rational design and synthesis of metal−organic frameworks (MOFs) have attracted upsurging research interest not only for their fascinating topological networks [1], but also for their potential applications in luminescent sensors [2], catalysis [3], gas storage/separation [4], magnetism [5], drug delivery [6], and so on. <...> In contrast, biphenyl-2,4,6,3',5'-pentacarboxylic acid (H5Bppc) as a member of multidentate O-donor ligand is rarely investigated [21, 22]. <...> Among the organic linkers, N-donor ligands, such as pyrazine, 1,2-di(pyridin-4-yl)ethane, 1-(biphenyl4-yl)-1H-imidazole, 4,4'-bipyridine, 2,2'-bipyridine, are frequently used as ancillary ligand, which can act as bridging, chelating, and charge balance ligands via protonation [23, 24]. <...> The infrared spectra (4000–400 cm−1) were recorded by using KBr pellet on a FT-IR Nexus spectrophotometer. <...> Powder X-ray diffraction (PXRD) patterns for microcrystalline samples were taken on a Rigaku Ultima IV diffractometer (CuKα radiation, λ = 1.5406 Е), with a scan speed of 8°/min and a step size of 0.02° in 2 <...>