Synthesis, crystal structure and fluorescence of a two-dimensional coordination polymer with 1-(pyrazin-2-yl)pyridine-2(1H)-one and thiocyanate as mixed bridge ligands

Abstract

A two-dimensional sheet coordination polymer, [Cd(μ-C9H7N3O)(μ-NCS)2] n , (C9H7N3O=1-(pyrazin-2-yl)pyridin-2(1H)-one), has been synthesized with 1-(pyrazin-2-yl)pyridin-2(1H)-one and thiocyanate anion as bridging ligands, and its crystal structure determined by X-ray crystallography. The crystal belongs to monoclinic system with space group P21 /c, and its relevant crystal parameters are: a = 7.5392(16) Å, b = 18.343(4) Å, c = 10.155(2) Å, β = 106.362(3)°, Z = 4, V = 1347.4(5) Å3, C11H7CdN5OS2, D Calcd = 1.980, R = 0.0516. The crystal structure reveals that both 1-(pyrazin-2-yl)pyridin-2(1H)-one and thiocyanate anion connect adjacent Cd(II) ions resulting in a two-dimensional sheet structure in the bc plane. There are weak π–π stacking interactions between adjacent pyridine rings. The coordination polymer has weaker fluorescent emission in the solid state than 1-(pyrazin-2-yl)pyridin-2(1H)-one compound, attributed to the π–π stacking interaction and the coordination effect.