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Three new complexes, namely, [Cu2(H2bdcpb)2(pyridine)2] (1), [Cu3(bdcpp)2(CH3NCH3)(H2O)] (2), and [Cu2(H2bdcpp)2(H2O)2]·2H2O (3), have been synthesized through the hydro/solvothermal reaction of cupric nitrate and lab-synthesized 1,3-bis(2′,4′-dicarboxylphenyl)benzene (H4bdcpb) or 2,6-bis(2′,4′-dicarboxylphenyl)pyridine (H4bdcpp) in the presence of different solvent systems. Isostructural complexes 1 and 3 show dinuclear [Cu2(COO)4] covalent modes with different coordinate solvent molecules. In complex 2, a two-dimensional covalent layer is generated from one-dimensional loop chains interconnected by [Cu2(COO)4] paddle-wheels. Structural analyses revealed that the framework stability of complexes 1–3 originated from molecular custom-designed [Cu2(COO)4] paddle-wheel units by symmetrical 2′,4′-dicarboxyl polyaromatic ligands. Three new complexes have been synthesized through the hydro/solvothermal reaction of cupric nitrate and two lab-synthesized polycarboxylates in the presence of different solvent systems. Among them, two isostructural complexes show dinuclear [Cu2(COO)4] covalent modes, while the other complex is a two-dimensional covalent layer. Structural analyses revealed that the framework stability of the complexes originated from molecular custom-designed [Cu2(COO)4] paddle-wheel units. [ABSTRACT FROM AUTHOR]

By systematic change of the solvothermal synthesis, three new coordination polymers, [Cd(L)∙(H2O)]∙2H2O (1), [Cd(L)∙(H2O)]∙H2O (2), and [Cd(L)] (3), have been synthesized based on a tritopic ligand 4-(pyridin-3-yl)isophthalic acid (H2L). Compounds 1 and 2 show very similar two-dimensional (2D) bilayers further linked by interlayer hydrogen bonds into three-dimensional (3D) supramolecular structures, while 3 displays a 3D structure constructed form one-dimensional (1D) Cd-carboxyl chains. Notably, 1 and 2 have a pair of unusual isomers with the opposite orientation of coordinated H2O on the metal centers, leading to different hydrogen bonding interactions. Thermal stabilities and solid-state photoluminescences for 1-3 were also investigated. [ABSTRACT FROM AUTHOR]

Two new coordination polymers (CPs) [Zn(HL)(H 2 O)] n ( 1 ) and [Zn 3 (L) 2 (H 2 O) 2 ] n ·(H 2 O) n ( 2 ), based on a multifunctional ligand combined carboxylate groups and a nitrogen donor group 5-(6-carboxypyridin-2-yl)isophthalic acid (H 3 L), have been synthesized under different solvent media and fully characterized by powder X-ray diffraction (PXRD), infrared (IR) spectra, elemental analyses (EA) and thermogravimetric analyses (TGA). Single-crystal X-ray diffraction analysis reveals that 1 shows 1D dimeric chain structure, while 2 gives a 3D dense packing framework. Topology analysis illustrates that 2 can be simplified as a 3-nodal net (4, 5, 6-connected net) with the point symbol of {4 4 ·6 2 }{4 6 ·6 4 } 2 {4 8 ·6 6 ·8}. In addition, solid state luminescent properties of two complexes have also been studied in detail, which may act as the potential optical materials. [ABSTRACT FROM AUTHOR]

From the same starting materials, two novel metal–organic frameworks, namely {(cation)[Cu 4 (bptca) 2 (OH)(H 2 O) 2 ]· x (solvent)} n ( 1 ) and {(cation)[Cu 3 (bptca) 2 (H 2 O) 3 ]· y (solvent)} n ( 2 ) (H 4 bptca = biphenyl-2,3,3′,5′-tetracarboxylic acid), have been synthesized through the linkage of Cu 2 (COO) 4 paddle-wheel clusters. The complex 1 possesses both dinuclear [Cu 2 O 2 ] subunits encapsulated into cage-like units and tetranuclear [Cu 4 ( μ 3 -OH) 2 ] clusters, which exhibits an unusual 3D 4-nodal (4,4,4,8)-connected network with {4 12 .8 12 .10 4 }{4 3 .8 3 } 4 {4 6 }{8 6 } topology. Reducing the metal-to-ligand ratio, the other 3D (4,4)-connected framework 2 with {4 2 .8 4 } PtS-type topology was constructed under the intervention of mononuclear Cu(bptca) 2 and single Cu 2 (COO) 4 paddle-wheel supporting layers. Notably, both of the frameworks 1 and 2 accommodate infinite open 1D nanosized quadrate channels. [ABSTRACT FROM AUTHOR]