8-Hydroxyquinoline salt of pyrazine-2,3,5,6-tetracarboxylic acid[HQ]2[H2pztc]·2H2O(1) was prepared and characterized by single-crystal X-ray diffraction,NMR,IR,TGA,elemental analysis and fluorescent measurements.Compound 1 crystallizes in orthorhombic,space group Pbcn with α = 9.953(3),b = 15.966(3),c = 16.081(5) A,V= 2555.5(13) A3,Z = 4,μ = 0.122mm-1,Dc= 1.514 Mg/m3,T= 296(2) K,C26H22N4O12,M,= 582.48,F(000) = 1208,S= 1.006,R =0.0448 and wR = 0.1149.Compound 1 has a three-dimensional(3D) network,in which pyrazine-2,3,5,6-tetracarboxylic acids build up two-dimensional(2D) sheets and 8-hydroxyquinoline cations and water molecules act as pillars to connect the 2D sheets into an extended 3D network through strong intermolecular hydrogen bonding and π…π stacking interactions.Especially,a very short O-H…O hydrogen bond(O…O 2.470(2) A) between two neighboring[H2pztc]anions was observed.
