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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]

Abstract: A novel coordination polymer based on silver(І) and mixed ligands {[Ag2(bpdc)(bpp)(H2O)]·2H2O} n (1) (H2bpdc=2,2′-bipyridyl-4,4′-dicarboxylic acid, bpp=1,3-bis(4-pyridyl)propane), has been prepared by hydrothermal method. Compound 1 has a 2D polymeric structure extended with subunits tetranuclear silver with Schläfli symbol {3^12;4^9;5^6;6^9}{3^18;4^22;5^5}. Compound 1 represents an Ag-containing polymeric compound possessing room-temperature luminescence. [Copyright &y& Elsevier]

Abstract: A 2D network complex [Ag2(pydco)] n (1) (pydco=pyridine-2,6-dicarboxylic acid N-oxide) was synthesized and structurally characterized. Fluorescence spectrum of complex 1 and the free ligand indicates that the cooperative association of Ag–Ag contacts and the intraligand (π–π∗) interactions lead to the unusual intense fluorescent emission upon photoexcitation. [Copyright &y& Elsevier]

Two new thioether tricarboxylic acid ligands have been designed and used to fabricate Cu-based CPs. Different substituent groups in ligands lead to not only the different valences of copper ions but also different clusters for CPs 1 and 2. CP 1 shows fluorescent sensing toward Fe3+ and Cr 2 O 7 2− ions with good selectivity and low detecting limit. • Two thioether tricarboxylic acid ligands with different substituent groups were designed. • Different substituent groups in ligands lead to monovalent Cu+ and divalent Cu2+ CPs. • Cu(I)- and Cu(II)-CP contains novel hexanuclear [Cu 6 (CO 2) 6 and dinuclear [Cu 2 (CO 2) 4 clusters, respectively. • Cu(I)-CP exhibits fluorescence sensing for Cr 2 O 4 2− and Fe3+ ions. Two new symmetrical tripod thioether tricarboxylic acid ligands, 1,3,5-tris(4-carboxyphenylsulfanylmethyl) benzene and 1,3,5-tris(4-carboxyphenylsulfanylmethyl)-2,4,6-trimethylbenzene (H 3 L and CH 3 -H 3 L) have been designed and synthesized. The reaction of two ligands with Cu2+ ions afforded two Cu-based cluster coordination polymers (CPs), [Cu 3 L] n (1) and {[Cu(CH 3 -HL)DMF]·DMF} n (2). It was interesting to note that the substituent groups on central phenyl rings in ligands caused the bend tripodal and planar geometries as well as different coordinated modes for H 3 L and CH 3 -H 3 L, respectively, leading to different structures of CPs 1 and 2. 1 with monovalent Cu+ ions shows a 3D layer-stacking framework with hexanuclear [Cu 6 (CO 2) 6 clusters, while 2 with divalent Cu2+ ions forms a 1D chain with dinuclear [Cu 2 (CO 2) 4 paddlewheel clusters. 1 shows strong orange fluorescence and exhibits fluorescence sensing for Cr 2 O 4 2− and Fe3+ ions with good selectivity and sensitivity. [ABSTRACT FROM AUTHOR]

Based on the N-donor auxiliary ligand effect, two new Ni(II) coordination polymers [Ni 2 (HL) 2 (bpe) 2 ] ( 1 ) and [Ni(HL)(bipy)(H 2 O) 2 ] ( 2 ) [H 3 L = 2-(4′-carboxyphenyl)terephthalic acid; bpe = 1,2-bis(4-pyridyl)ethane; bipy = 4,4′-bipyridine] have been successfully synthesized and characterized by single-crystal X-ray diffraction study, elemental analysis, IR spectra, TGA and powder X-ray diffraction (PXRD). This work presents a comparative study on the tuning of structural topologies by using two N-donor ligands with different lengths as auxiliary ligands. The structural determination reveals that complex 1 , incorporating bpe ligands, features a three-dimensional (3D) 4-connected 4-fold dia interpenetrating architecture with the point symbol of 6 6 , while 2 , containing bipy ligands, exhibits a two-dimensional (2D) sql layer structure with a 4-connected (4 4 ·6 2 ) topology. Moreover, the magnetic properties for 1 and 2 were also measured and compared on account of their different structures. [ABSTRACT FROM AUTHOR]

A new one-dimensional (1D) 4d–4f heterometallic coordination polymer [ErAg(Himdc)2(H2O)3] (1) (H3imdc=4,5-imidazoledicarboxylic acid) is synthesized under hydrothermal condition and characterized by elemental analysis, IR, PXRD and single crystal X-ray diffraction. Complex 1 crystallizes in the triclinic space group P-1, showing a 1D metal–organic pseudo-nanotube with a 4.014×12.027Å2 cross-section. Furthermore, it assembles into a 3D supramolecular architecture via hydrogen bonds between pseudo-nanotubes. The complex 1 exhibits solid-state photoluminescence and high thermal stability. [ABSTRACT FROM AUTHOR]

Abstract: A new 1D Pb(II) coordination polymer, {[Pb(Hbidc)(phen)]·H2O}n (1), has been synthesized by a solvothermal method based on 1H-benzimidazole-5,6-dicarboxylato (H3bidc) and 1,10-phenanthroline (phen). Complex 1 features two types of helical chains, a 1D left- and right-handed double-stranded helical chain and a supramolecular helical chain, which interweave into a new (3,3,6)-connected achiral 3D supramolecular network. Notably, the supramolecular helical chains are induced by the different spatial orientations of the 1D double-stranded helical chains. The structure and properties of 1 have been determined by single crystal X-ray diffraction, powder X-ray diffraction (PXRD), elemental analysis (EA), thermogravimetric (TG) analysis and solid state fluorescence spectra. [Copyright &y& Elsevier]

Abstract: An unusual 3D pillared-layer CoII coordination polymer, namely [Co(pda)(bpe)] n (1) [H2pda=1,3-phenylenediacetic acid, bpe=1,2-bi(4-pyridyl)ethylene], has been successfully prepared under hydrothermal condition. X-ray crystal analysis indicates that the structure of 1 is constructed from 2D undulated [Co(pda)] n layers, which consists of alternating left- and right-handed helical motifs, and then further pillared by bpe ligands into a 3D structural framework. Topologically, complex 1 shows an intriguing binodal (3,5)-connected fsc network with the Schläfli symbol of (4.62)(4.66.83) which is completely different from the reported (4,6)-connected fsc nets; and if the dimeric [Co2] units (SBUs) are considered as the single 6-connected nodes, 1 displays a familiar uninodal pcu net with the Schläfli symbol of (412.63). In addition, magnetic measurement revealed that 1 shows the antiferromagnetic coupling between CoII ions. [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: 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]

Two different alkaline earth metal coordination polymers (AE-CPs) {[Ca 3 L 2 (H 2 O) 6 ]·2H 2 O} n (1) and [Sr(H 2 L) 2 ] n (2) were constructed from using 5-(ethyl oxamate)-isophthalic acid (H 2 EtL) ligand with alkaline earth metal ions Ca2+ and Sr2+ under solvothermal conditions, respectively. Among them, L and H 2 L are formed by in-situ hydrolysis of H 2 EtL, which display multiple kinds of coordinated modes through oxamate and carboxylate groups. 1 and 2 both show three-dimensional coordination frameworks possessing unprecedented (3,4,5)-connected skg1 topology and (3,6)-connected ant topology, respectively. The solid-state fluorescence properties of 1 and 2 were studied, and 1 with bright blue luminescence reveals selective sensing toward Fe3+ ion in water with the low detection limit (LOD) of 1.04 × 10−3 M. Two new AE-CPs were constructed from a new oxamate-dicarboxylic ligand, revealing novel 3D frameworks and strong luminescent properties. In addition, 1 shows fluorescent sensing toward Fe3+ ion in water with good sensitivity and recyclability. Unlabelled Image • Two novel coordination polymers based on alkaline earth metal ions and a new oxamate-dicarboxylate ligand. • Two coordination polymers reveal diverse topologies due to different coordinated modes of ligands. • Ca-complex shows selective luminescence sensing toward Fe3+ ion in water. [ABSTRACT FROM AUTHOR]