Syntheses, structures and adsorption properties of two-dimensional Cd(II) coordination polymers.

2D coordination complexes [Cd(1,3-pbpa)(1,3-PDA)] n , 1 and [Cd(1,3-pbpa)(OBA)·2H 2 O] n , 2 , exhibit rare {84·122}{8}2-2,4L2 topology, and [Cd(1,3-pbpa)(1,4-BDC)(H 2 O)·EtOH·H 2 O] n , 3 shows a new topology having point symbol {12}{4·125}{4}. Desolvated product of 2 exhibits a better H 2 and CO 2 sorption compared to the activated product of 1 , indicating the effect of ligand type on the adsorption properties of 2D complexes. Solvothermal reactions of Cd(CH 3 COO) 2 and 2,2′-(1,3-phenylene)-bis(N-pyridin-3-yl)acetamide (1,3-pbpa) with 1,3-phenylenediacetic acid (1,3-H 2 PDA), 4,4′-oxybis(benzoic acid) (4,4′-H 2 OBA) and 1,4-benzenedicarboxylic acid (1,4-H 2 BDC) afforded [Cd(1,3-pbpa)(1,3-PDA)] n , 1 , [Cd(1,3-pbpa)(OBA)·2H 2 O] n , 2 , and [Cd(1,3-pbpa)(1,4-BDC)(H 2 O)·EtOH·H 2 O] n , 3 , respectively, which were structurally characterized as two-dimensional (2D) coordination polymers. Complexes 1 and 2 show the rare {84·122}{8}2-2,4L2 topology, whereas complex 3 adopts a new topology with a point symbol of {12}{4·125}{4}, which can be further simplified as the 44- sql topology and the 63- hcb topology, respectively. Desolvated product of 2 shows a moderate uptake of CO 2 and a good selectivity over N 2 , which also exhibits a better H 2 and CO 2 sorption compared to the activated product of 1 , indicating the effect of ligand type on the adsorption properties of 2D complexes with the 44- sql topology. Thermal gravimetric analysis (TGA) and the solid state luminescence properties of 1 – 3 have also been investigated. [ABSTRACT FROM AUTHOR]