Two 3D Zinc(II) coordination frameworks constructed from pyrazine-2,3-dicarboxylate and 1,2-bis(4-pyridyl)ethylene

Abstract

Two 3D coordination polymers, {[Zn(mu(3)-pzdc)(mu-dpeten)(0.5)]center dot 3H(2)O}(n) (1) and [Zn(mu(3)-pzdc)(mu-dpeten)(0.5)](n) (2) (H(2)pzdc = pyrazine-2,3-dicarboxylic acid and dpeten = 1,2-bis(4-pyridyl)ethylene) have been synthesized by hydrothermal methods and structurally characterized by elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction. In complex 1, each pzdc ligand bridges three Zn(II) ions through forming two-dimensional layers. The adjacent 2D layers are further connected by dpeten ligand to generate a novel 3D framework containing one-dimensional large porous channel. It displays a 5 connected bnn hexagonal topology with point symbol {4(6).6(4)}. Although the complex 2 was obtained under the same reaction conditions together with complex 1, it exhibits 3D -> 3D a 2-fold interpenetration network with 6-connected pcu alpha-Po primitive cubic topology with point symbol {4(12).6(3)}. The adjacent three Zn(II) ions are linked by tridentate bridging pzdc ligands to form a 2D layer structure. The 2D layers are further bridged by dpeten ligand to form a 3D pillar-layered network. Moreover, thermal and photoluminescent properties of complexes 1 and 2 have also been studied. (C) 2017 Elsevier B.V. All rights reserved.