Synthesis and characterization of two new triazolate–aliphatic dicarboxylate bridged Zn(II) coordination polymers based on 2D layer motifs with different crystal packing

Two new zinc(II)–triazole–aliphatic dicarboxylate coordination polymers, [Zn(trz)(Hsuc)]n (1), [Zn2(trz)2(tar)]n (2), have been hydrothermally synthesized by reaction of Zn salt, Htrz with H2suc and H2tar, respectively (Htrz = 1,2,4-triazole, H2suc = succinic acid, H2tar = tartaric acid). structures were determined by single-crystal X-ray diffraction analyses and further characterized by X-ray powder diffraction, elemental analyses, IR spectra and TG analyses. Compound 1 displays a 2D layer structure containing {[Zn4(trz)4]4+}n layers decorated by the suc ligand. Compound 2 is in a 3D structure formed by the interconnection of 2D {[Zn4(trz)4]4+}n layers with tar ligand, resulting a 3,4-connected topological network. Due to the different coordination mode and conformation of aliphatic carboxylate ligand, the similar 2D {[Zn4(trz)4]4+}n layers stack in the –AAA– fashion in 1, while the {[Zn4(trz)4]4+}n layers hold together in the –ABAB– stacking sequence in 2. Additionally, the two compounds show strong fluorescence in the solid state at room temperature.