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Three cadmium(II) coordination polymers constructed from 5,7-disulfonate-1,4-naphthalenedicarboxylate and N-containing ligands, {[Cd2(DSNPDC)(phen)(H2O)4]·2.5H2O}n (1), {[Cd2(DSNPDC)(phen)2(H2O)4]·3H2O}n (2) and [Cd2(DSNPDC)(bpy)2(H2O)4]n (3) (H4-DSNPDC = 5,7-disulfonate-1,4-naphthalenedicarboxylic acid, phen = 1,10-phenanthroline, and bpy = 2,2′-bipyridine), were synthesized and characterized. Compound 1 displays a two-dimensional (2D) layered structure. In 2 and 3, the dinuclear [Cd2(COO)2] units are connected by DSNPDC4– ligands to generate one-dimensional (1D) chains. Due to the presence of the terminal chelating phen/bpy ligands, all compounds show low dimensional structures. Compounds 1–3 exhibit fluorescence emissions centered at 378, 419 and 376 nm, respectively, which are assigned to ligand-centered emissions or ligand-to-metal charge transfer. [ABSTRACT FROM AUTHOR]

Reactions of cadmium(II) salts with 3-amino-5-methylthio-1H-1,2,4-triazole (Hamstz) afforded two cadmium(II) coordination polymers, [Cd2(amstz)2Cl2]n(1) and [Cd2(amstz)2(NO3)2]n(2). Compounds1and2feature 2-D layered structures based on the dinuclear [Cd2(amstz)2] subunits. The cadmium coordination polyhedra are tetrahedral and tetragonal pyramidal in1and2, respectively, due to the presence of different coordinated anions, Cl−and NO3−. Compounds1and2exhibit photoluminescence emission with maxima at 620 and 621 nm upon excitation at 470 and 472 nm, respectively, which can be attributed to the ligand-to-metal charge transfer emssion. [ABSTRACT FROM AUTHOR]

Two cadmium(II) coordination polymers, namely, [Cd3( 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 atphth2- 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. [ABSTRACT FROM AUTHOR]