Search

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]

The reactions of Ln(NO3)3with 2,5-dihydroxy-1,4-benzenedicarboxylic acid (H2-DHBDC) under solvothermal conditions produce a series of isomorphous lanthanide coordination polymers with the empirical formula {[Ln2(DHBDC)3(DMF)4](DMF)2}n(Ln = La(1), Nd(2), Sm(3), Gd(4), and Er(5)). Compound {[Ln2(DHBDC)3(DMF)4](DMF)2}ncontains dinuclear Ln2(COO)6units, which are linked by the –C6H2(OH)2– spacers to form a three-dimensional framework exhibiting α-Po topology (pcu-(412·63) net) based on dinuclear Ln2(COO)6nodes. The three-dimensional framework shows one-dimensional open channels that accommodate the coordinated and guest DMF molecules. Gas adsorption measurements on compound 4indicate that the desolvated solid of 4adsorbs CO2and shows nonporous behavior toward N2. The adsorption favoring CO2over N2may arise from the chemical environments of the host framework, which contains the polar –OH groups of the phenyl and the π-electrons of the ligands. Magnetic measurements on compound 4indicate that there is an antiferromagnetic interaction between Gd3+ions. [ABSTRACT FROM AUTHOR]

Solvo(hydro)thermal reactions of CuX (X = Cl, Br, I) with 4-methyl-1,2,4-triazole-3-thiol (Hmptrz) ligand afforded four new copper(I) coordination polymers, namely, [Cu(μ4-mptrz)]n(1), [Cu(μ2-Hmptrz)(μ2-I)]n(2), [Cu12(μ4-mptrz)4(μ4-I)3(μ3-I)4(μ2-I)]n(3), and [Cu(μ2-Hmptrz)(μ2-DmptrzSS)I]n(4) (DmptrzSS = 4,4′-dimethyl-3,3′-dithiodi-1,2,4-triazole), respectively. Single-crystal X-ray diffraction revealed that compound 1has a two-dimensional (2D) layered structure with (44·62) topology and contains meso-helical (CuS)nchains. Compound 2features a one-dimensional (1D) chain structure constructed from an unusual inorganic [Cu(μ2-S)2Cu(μ2-I)2Cu]nchain formed from two types of four-membered Cu2(μ2-S)2and Cu2(μ2-I)2rings. Compound 3is a two-dimensional (2D) structure constructed from rugby-shaped Cu6I5and planar Cu4I3cluster units, and two types of Cu(mptrz)2units. The I−ion in structure 3displays its coordination versatility with μ4-, μ3-, and μ2- bridging coordination modes. Compound 4has a double-stranded chain structure containing an Hmptrz ligand and DmptrzSS ligand formed from in situ reaction. The structural diversity of these materials is reflected in the variety of coordination polyhedra displayed by the metal sites: linear, trigonal, and tetrahedral. Compounds 1−3exhibit photoluminescences with fluorescent emissions varying from green to red in the solid state. Some structure-related emission shifts compared to the free ligand are studied. The reaction mechanism of the formation of DmptrzSS ligand has been proposed. In addition, elemental analysis, infrared spectra, and thermogravimetric analysis of compounds 1−4are also described. [ABSTRACT FROM AUTHOR]