Solvothermal synthesis and luminescence properties of a novel Cd(II) coordination polymer containing 3-pyridinecarboxylate and phen ligands and [TaF6]- anion

Abstract A novel chain coordination polymer {[Cd2(H2O) (C6H4NO2)3(C12H8N2)2][TaF6]}n (1) [(C6H4NO2)−: 3-pyridinecarboxylate, C12H8N2: 1,10-phenanthroline (phen)] was prepared successfully by two-step solvothermal synthesis. The compound has been structurally characterized by elemental analysis, IR spectrum and X-ray single-crystal diffraction. In the titled compound, each Cd2+ cation adopts two O atoms from one 3-pyridinecarboxylate ligand, two N atoms from one phen ligand and two N atoms from two different 3-pyridinecarboxylate ligands to generate a slightly distorted octahedron. Neighboring two Cd2+ cations are linked by one N atom and one O atom from the same carboxylate group with the Cd⋯Cd distance of 8.520 A. The dinuclear fragment is further extended into a 1-D infinite chain structure through N atoms and O atoms from carboxylate groups. The neighboring chains are interconnected into a three-dimensional supramolecular network by means of three types of hydrogen bonds O1(water)–H···O, C–H⋯O and C–H⋯F. In addition, the fluorescence excitation and emission spectra, quantum yield and decay lifetime of the compound have been also studied in this text.