Hydrothermal synthesis, crystal structures and luminescent properties of two new carboxylate-dependent Cd(II)-guanazole (3,5-diamino-1,2,4-triazole) frameworks

Two new Cd(II) coordination polymers, namely [Cd3(Hdatrz)2(L1)3(H2O)2]n·2n(H2O) (1) and [Cd2(Hdatrz)(L2)2]n (2) (HL1 = benzoic acid, H2L2 = iminodiacetic acid, Hdatrz = 3,5-diamino-1,2,4-triazole), have been synthesized by combining the mixed ligands of HL1/H2L2 and Hdatrz with Cd(II) salts under hydrothermal conditions. Single-crystal X-ray diffraction analysis reveals that the structure of 1 features a two-dimensional (2D) layer structure based on Cd(II)-Hdatrz layer and the structure of 2 features a three-dimensional (3D) pillar-layered framework based on Cd(II)-L2 layer and Hdatrz pillars. Moreover, luminescent properties of compounds 1–2 have been also investigated in the solid-state at room temperature.