Syntheses, Structures, and Photoluminescence of Two Three-dimensional Cadmium Coordination Polymers with Benzenedicarboxylate Ligands

Two cadmium(II) coordination polymers, namely, [Cd-3(m-phth)(2)(atz)(2)](n) (1) (m-phth = m-phthalate and atz = 3-amino-1,2,4-triazolate) and [Cd(atphth)(H2O)](n) (2) (atphth = 2-aminoterephthalate), were synthesized and structurally characterized. Compound 1 features a three-dimensional (3D) pillared framework based on two-dimensional (2D) cadmium-benzenedicarboxylate ladders pillared by the triazolate ligands. Compound 2 has a 3D framework constructed from 2D cadmium-benzenedicarboxylate layers, which are further linked by Cd-N bonds between the cadmium ions and amino groups of the atphth(2-) ligands of the adjacent layers to form the final 3D structure. Compounds 1 and 2 exhibit solid-state photoluminescence with emission maxima at 448 and 470 nm, respectively.