Effects of different carboxylates and pyrazine ligands on silver(I) coordination polymers: Syntheses, crystal structures, thermal stabilities and photoluminescent properties

Abstract

Four silver(I) coordination polymers (CPs), namely {Ag3(cpyz)(btc)}n (1), {Ag2(cpyz)(pta)}n (2), {Ag3(mpyz)2(btc)·2(H2O)}n (3), {Ag2(mpyz)(pta)·2(H2O)}n (4), [cpyz=2-chloropyrazine, H3btc=1,3,5-benzene tricarboxylic, mpyz=2,6-dimethylpyrazine, H2pta=phthalic acid] have been synthesized and characterized. X-ray diffraction indicates that, 1 shows a 3D supramolecular structure with a 1D silver chain containing an infinite Ag3 units; 2 features a 3D supramolecular framework with Ag-O and Ag-Ag interaction and cpyz ligand adopts monodentate mode making no contribution to the dimensionality; in 3, the silver atom links mpyz ligand and btc anion into a 2D layer connected by Ag-Ag interaction between neighboring layers into the 3D network, with Zigzag Ag4 units; in 4, Ag(I) coordinates pta benzene dicarboxylates to generate a one-dimensional infinite chain, connecting by nitrogen ligand to exhibit a 2D 44-sql network. The results suggest that benzene dicarboxylates and the kinds of pyrazine derivatives play significant roles in the formation of such coordination architectures. The photoluminescence and thermogravimetric analysis (TGA) of the complexes were measured.