title: catena-Poly[[[diaquazinc]-bis{μ-N2,N6-bis[(pyridin-3-yl)methyl]pyridine-2,6-dicarboxamide}] dinitrate].
abstract: In the title compound, {[Zn(C(19)H(17)N(5)O(2))(2)(H(2)O)(2)](NO(3))(2)}(n), the Zn(II) cation is located at an inversion centre within a slightly distorted octahedron, ligated by four N atoms from four N(2),N(6)-bis[(pyridin-3-yl)methyl]pyridine-2,6-dicarboxamide (L) ligands occupying a plane about the Zn(II) atom with the two water O atoms perpendicular to that. In the complex molecule, the bidentate bridging L ligands display helical R and S conformers, and link the Zn(II) cations into a one-dimensional centrosymmetric double-chain structure containing 32-membered rings. The nitrate anions reside in these rings and are involved in multiple N-H...O hydrogen-bond interactions. On excitation at 390 nm, the title compound displays a strong blue emission centred at 449 nm. Investigation of the thermal stability shows that the network structure is stable up to 420 K.
authors.affiliation: Department of Environmental and Municipal Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou 450011, People's Republic of China. lifazhan2000@sina.com
authors.forename: Fa-Zhan
authors.initials: FZ
authors.lastname: Li
authors.forename: Guo-Ting
authors.initials: GT
authors.lastname: Li