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Highlights: [•] Four complexes with multiple helical characters are obtained upon a bis(triazole) ligand and dicarboxylate ligands. [•] The complexes are structurally characterized through single crystal X-ray diffraction. [•] Dicarboxylate coligands play a crucial role in tuning and enriching helical characters of coordination polymers. [ABSTRACT FROM AUTHOR]

Five coordination complexes [Cd(hbmb)(tbi)] n (1), [Cd(hbmb)(adi)] n (2), [Zn(hbmb)0.5(atda)] n (3), {[Zn2(hbmb)(suc)1.5(OH)]·2H2O} n (4), and {[Zn2(hbmb) (fum)1.5(OH)]·2H2O} n (5) (H2tbi=5-tert-butylisophthalic acid, H2adi=adipic acid, H2atda=1,3-adamantanediacetic acid, H2suc=succinic acid, H2fum=fumaric acid, hbmb=1,1′-(1,6-hexane)bis-(2-methylbenzimidazole)) have been hydrothermally synthesized and structurally characterized. Complex 1 is an undulated 2D structure with (63)2 topology, containing left- and right-handed helical chains. Complex 2 possesses a puckered two-dimensional (2D) network with 44·62 topologies symbol. Complex 3 exhibits a 2D (4, 4) parallelogram network and also owns left- and right-handed helical chains. Complexes 4 and 5 display 2D rectangular grids and can be simplified as a four-connected 44·62 topological network. Moreover, the photoluminescence properties and thermal stabilities of the five complexes were investigated. [ABSTRACT FROM AUTHOR]

Abstract: Reaction of methylene-bis(1,1′-benzimidazole) (mbbz) with CdI2 produces a complex [Cd(mbbz)I2]3 (1) containing the soft coordinated I − anions, which shows a trinuclear cage-like structure. Immersing complex 1 into the aqueous solution of NaN3, we obtained the exchanged product [Cd(mbbz)2(N3)2] n (2). The single-crystal X-ray diffraction shows that complex 2 presents a 3D 2-fold interpenetrating 4-connected framework with 66-dia topology. The results indicate that the soft coordinated I − anions can be completely exchanged by borderline N3 − anions, simultaneously, accompanying the structural transformation from a trinuclear cage to a 3D framework. Furthermore, the AFM and EDS data reveal that the exchange is a recrystallization process with solvent-mediated mechanism. [Copyright &y& Elsevier]