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2-Fold interpenetrating chiral quartz nets with opposite handedness have been observed in a centrosymmetric coordination polymer {[Zn3(bmzbc)6]·11.5DMF}n (Hbmzbc = 4-(benzimidazole-1-yl)benzoic acid), which is a unique example of an interpenetrating enantiomorphic pair of quartz nets that have never been realized before. [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]

Hydro(solvo)thermal reactions of cadmium(ii) salts with 4-methyl-1,2,4-triazole-3-thiol (Hmptrz) afforded six novel cadmium(ii) coordination polymers, namely, [Cd(mptrz)2]n(1), [Cd(mptrz)X]n(X = Br (2) and I (3)), [Cd(mptrz)(μ2-X)]n(X = Br (4) and Cl (5)), and [Cd3(μ3-OH)2(mptrz)4]n(6). Compound 1is a 1D looped chain structure. Compounds 2and 3are isostructural and have 1D ladder structures. Compounds 4and 5are isomorphs and feature 2D layered structures. Cadmium(ii) bromide formed 1D ladder of 2and 2D layer of 4, representing an unusual example of Br bond isomerism. Compound 6has a 1D tape structure with an uncommon 1D inorganic Cd2(μ3-OH)2–Cd–Cd2(μ3-OH)2 chain. The structural diversity of these materials is reflected in the variety of coordination polyhedra displayed by the cadmium sites: tetrahedral; trigonal bipyramidal; octahedral. The solid state photoluminescence of all compounds have been investigated. However, only compound 6exhibits photoluminescence with an emission maximum at 435 nm upon excitation at 346 nm. Solid-state density functional theory (DFT) calculations were performed on compound 6. In addition, these compounds were characterized by IR, elemental analysis, and thermogravimetric analysis. [ABSTRACT FROM AUTHOR]