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Abstract: Via hydrothermal synthesis, the self-assembly of d10 metal, 2,4′-dipyridylamine (L) and 1,3-adamantanediacetic acid (H2ADA) generated two unprecedented coordination polymers [Zn(ADA)(L)] n (1) and [Cd(ADA)(L)2] n (2). Complex 1 possesses a novel 1D looped-chain topology structure decorated with arms. Complex 2 shows an extended threaded framework involving 2D coordination layers of square (44) topology with dangling ligands, which gives the novel (2D→3D) polythreaded array. To the best of our knowledge, complex 2 is the first example with four dangling arms coordinated in the axial sites of dinuclear nodes. In addition, both of the complexes show strong photoluminescence at room temperature, and may be good candidates for potential luminescence materials. [Copyright &y& Elsevier]

To seek novel dysprosium based single-molecule magnets, a dinuclear dysprosium complex, namely [Dy 2 (L) 2 (DBM) 2 (DMF) 2 ]·2DMF ( 1 ) was successfully obtained by employing tridentate Schiff base ligand (where H 2 L = 2-hydroxy-N′’-(2-hydroxy-3-methoxybenzylidene) benzohydrazide), HDBM = dibenzoylmethane, DMF = dimethylformamide). Single-crystal X-ray structural analysis reveals that the key feature of 1 is neutral dinuclear complex, in which two Dy(III) ions with eight-coordinated environment are bridged by two phenoxido oxygen atoms from two Schiff base ligands. Interestingly, complex 1 could be regarded as the structurally related derivatives to our previous reported complex of [Dy 2 (L) 2 (DBM) 2 (DMF) 2 ] ( 1a ) but adding two guest DMF solvents. More importantly, the energy barrier to magnetic relaxation of 1 is slightly higher, with a value of 33 K, when compared to the corresponding complex 1a of 24 K, which provides a good example towards regulating magnetization dynamics in dinuclear dysprosium (III) single-molecule magnets by guest solvent molecules. [ABSTRACT FROM AUTHOR]

Abstract: A new metal-organic framework (MOF), [Zn3(4,4’-ADB)3(BIB)2]n (1) has been synthesized based on mixed bridging ligands BIB and 4,4’-ADB (BIB=1,4-bis(2-methyl-imidazol-1-yl) butane, 4,4’-ADB=azobenzene-4,4’-dicarboxylica acid). This MOF is a 3D structure with trinuclear zinc(II) clusters as SBU. The trinuclear zinc (II) clusters of line style feature zincs in two tetrahedral and one octahedral coordination environments. The MOF exhibits a 3-fold interpenetrated framework with 36·418·53·6 topology, which reduces the effective void but stabilizes the compound. [Copyright &y& Elsevier]

Abstract: A new three-dimensional terbium-carboxylate framework [Tb4L3(H2O)9]·7H2O (1) [(H4L=4,4′-(hexafluoroisopropylidene)diphthalic acid)] has been hydrothermally synthesized and structurally characterized. The framework contains Tb2 and Tb4 clusters, and exhibits an unprecedented 4-nodal (3,4,5,8)-connected topology. In addition, the thermogravimetric analysis, luminescent and magnetic properties were investigated. [Copyright &y& Elsevier]

Abstract: Three coordination polymers containing 2-(2-pyridyl)benzimidazole (PyHBIm) ligand, namely {[Zn3(PyBIm)3(PyHBIm)2(tma)(H2O)]•H2O}n (1), [Zn(PyHBIm)(oba)]n (2), [Cd(PyHBIm)(oba)]n (3), (tma=trimesate, oba=4,4′-oxybis-(benzoate)), have been prepared through hydrothermal reaction. Compound 1 exhibits one-dimensional (1D) helical structure. However, compounds 2 and 3 display 1D meso -helical structure. These 1D structures are further assembled into three-dimensional (3D) networks through aromatic π–π stacking interactions and hydrogen bonding interactions. Moreover they all exhibit strong photoluminescence at room temperature and may be good candidates for potential luminescence materials. [ABSTRACT FROM AUTHOR]

Abstract: A new CdII-coordination polymer, namely, [Cd3(nbtc)2·4H2O] n (1), has been hydrothermally synthesized with in situ generated 5-nitrobenzene-1,2,3-tricarboxylate (nbtc3−) ligand. Single-crystal X-ray diffraction study reveals that compound 1 is constructed from trinuclear CdII clusters and exhibits a previously unknown 2D (3,4,9)-connected (3.42)(32.43.5)(36.411.510.68.8) topology as well as 3D H-bonding pillared architecture. In addition, the photoluminescent property and thermal stability of 1 were also discussed. [Copyright &y& Elsevier]

Abstract: Two novel 1D compounds {[Ag3(Hbptc)(bpa)2]·H2O} n (1) and [Ag2(H2bptc)(bpp)2] n (2) (H4bptc=3,3′,4,4′-benzophenonetetracarboxylic acid, bpa=1,2-bis(4-pyridyl)ethane and bpp=1,3-bis(4-pyridyl)propane) were synthesized and structurally characterized. The crystal structures of compounds exhibit two kinds of ladder-like chains based on linear or T-shaped coordination environment of Ag(I). Fluorescence spectra of compounds 1 and 2 indicate the unusual intensity of fluorescent emission upon photoexcitation which may be attributed to ligand-to-metal charge transfer and Ag–Ag interactions. [Copyright &y& Elsevier]

Abstract: A novel 2D coordination polymer, formulated as [Cd2(Hpimdc)2(bpp)(H2O)] n (bpp=1,3-bis(4-pyridyl)propane, H3pimdc=2-propyl-4,5-imidazoledicarboxylate), has been hydro-thermally synthesized and structurally characterized, which shows unusual multifarious helical structures and (3,4)-connected network with (4.82)2(42.83.10) topology. The photoluminescent property and thermal stability of 1 were also discussed. [Copyright &y& Elsevier]