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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]

One new coordination polymer has been synthesized hydrothermally under the intervention of Ni(II) salts, 4,4′-sulfonyldibenzoate (H2sdba) with neutral linkers 2,5-bis(4-pyridyl)-1,3,4-thiadiazole (bpt), formulated as: [Ni(bpt)(sdba)(H2O)3]n (1). X-ray structural analysis reveals that polymer 1 displays one-dimensional zigzag chain with alternating intersectional terminal sdba units. The interactions of 1 D chains by pseudo-watertapes result in the formation of 3 D supramolecular network. Interestingly, two types of hydrogen bonding left- and right-handed helices appear simultaneously in the mesomeric framework 1. [ABSTRACT FROM AUTHOR]

A new complex,[Co2(OH)2L2(phen)2(H2O)2]·2(HL) (1) (HL = 2-fluoroisonicotinic acid, phen = 1,10-phenanthroline), has been synthesized using the slow-layered diffusion technique at room temperature. Single crystal X-ray analysis revealed that complex1is a dinuclearcobalt(II) complex connected by hydroxyl oxygen. The thermal stability was studied by thermogravimetric analysis (TGA). In addition, the variable-temperature magnetic property of the complex has been also discussed. The negativeθ, J or −E2/k values can be indicative of an overall antiferromagnetic coupling in addition to single-ionspin-orbital coupling. An interesting dinuclearcobalt(II) complex based on 2-fluoroisonicotinic acid were synthesized and structurally characterized. The two Co(II) centers are linked by μ2-OH−groups and there are uncoordinated HL molecules in the structure too. The thermal and the variable-temperature magnetic properties of the complex are also discussed. The negative θ,Jor −E2/kvalues can be indicative of an overall antiferromagnetic coupling in addition to single-ionspin-orbital coupling. [ABSTRACT FROM AUTHOR]

A new lead coordination polymer [Pb2(mip)2] (1) has been synthesized under the intervention of polycarboxylic acid by hydrothermal method (H2mip = 5-methylisophthalic acid). X-ray single-crystal structure determination reveals that the polymer crystallizes in monoclinic C2/c space group:a= 21.118(2) Å,b= 8.0055(7) Å,c= 25.556(3) Å, and β = 111.1730(10)°. The Pb(II) cations are connected by four mip anions to produce a 2D (6,3) double-layered framework. It should be noted that four-membered rings by two Pb atoms with twoμ-O atoms of mip groups link each other to form a one-dimensional Pb–O chain through a corner-sharing Pb center. [ABSTRACT FROM PUBLISHER]

A new complex [Pb(HL)(bipy)0.5] (HL = N-[(3-carboxyphenyl)-sulfonyl]glycine dianion, bipy = 4,4' -bipyridine) has been synthesized from the reaction of N-[(3-carboxyphenyl)-sulfonyl] -glycine with Pb(CH3COO)2· 3H2O in the presence of bipy at 70°C and structurally characterized by single-crystal X-ray diffraction. The complex crystallizes in triclinic, space group P-1 with a = 4.9448(4) Å, b = 11.5868(9) Å, c = 14.1272(11) Å, α = 78.7020(10)°, β = 80.1500(10)°, γ = 83.3080(10)°, the final R = 0.0195 and wR = 0.0491. X-ray analysis reveals that the crystal structure is constructed by mixed ligands. HL2 - acts as bridging ligand to link two adjacent metal ions to form a one-dimensional chain. These chains are further cross-linked by bridging bipy ligands along the c axis to generate a 2D layer. Lead(II) ions are six-coordinated with a distorted octahedral environment geometry. [ABSTRACT FROM AUTHOR]