Novel hydrogen-bonded three-dimensional network complexes containing copper-pyridine-2,6-dicarboxylic acid

The novel complex (H₃O)₂[Cu(2,6-pydc)₂]·H₂O (pydc?=?pyridinedicarboxylic acid) (1) has been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analyses and IR spectra. X-ray structural analysis revealed that the novel complex possesses both π–π stacking and hydrogen-bonding interactions for three-dimensional (3D) networks. Crystal data for 1: a?=?13.454(3), b?=?10.266(2), c?= 13.783(3)?Å, α?=?90.00, β?=?115.29(3), γ?=?90.00°, Z?=?3, R ₁?=?0.0423, wR ₂?=?0.1217.     

Synthesis,crystal structure and magnetic properties of 2D bi-layered coordination polymer

A new coordination polymer, [Ni(pydc)(H₂O)₂]?·?H₂O (1) (H₂pydc?=?pyridine-3,4-dicarboxylic acid), have been synthesized by treating Ni(II) nitrate with 3,4-pyridinedicarboxylic acid under hydrothermal conditions. The single-crystal X-ray structure reveals that 1 is a 2D bi-layered coordination polymer. Single-crystals are triclinic, space group P 1 , with a?=?7.065(3), b?=?7.812(4), c?=?9.031(4)?Å, α?=?75.568(8), β?=?68.970(8), γ?=?75.927(8)°, V?=?444.0(3)?ų, Z?=?2. Variable temperature magnetic susceptibility measurements demonstrate a ferromagnetic interaction in 1.     

Synthesis and structures of three triphosphonate compounds containing d10 transition metal ions

Three new triphosphonate compounds, [Zn(APTPH₄)(2,2′-bipy)(H₂O)]?·?2H₂O (1), [Cd(APTPH₄)(2,2′-bipy)(H₂O)]?·?2H₂O (2), and [Zn(APTPH₄)(phen)₂]?·?phen?·?4H₂O (3) (APTPH₆?=?1-aminopropane-1,1,3-triphosphonic acid, 2,2′-bipy?=?2,2′-bipyridine, phen?=?1,10-phenanthroline), are synthesized by a low-temperature hydrothermal method. Compounds 1 and 2 are isomorphous, both one-dimensional (1D) coordination polymers expanded into three-dimensional (3D) supramolecular structures by hydrogen bonds and π–π stacking interactions. Compound 3 is a molecular complex and forms a 3D network through an S-shaped water hexamer. Crystal data for 1: Triclinic, space group P 1, a?=?6.6814(5)?Å, b?=?10.0929(7)?Å, c?=?15.438(2)?Å, α?=?81.544(2)°, β?=?79.066(2)°, γ?=?82.278(2)°, Z?=?2; for 2: Triclinic, space group P 1, a?=?6.9380(8)?Å, b?= 10.043(2)?Å, c?=?15.681(2)?Å, α?=?81.357(2)°, β?=?78.510(2)°, γ?=?81.902(2)°, Z?=?2; Crystal data for 3: Triclinic, space group P 1, a?=?12.540(2)?Å, b?=?12.596(2)?Å, c?=?14.997(2)?Å, α?=?100.795(2)°, β?=?113.328(2)°, γ?=?101.358(2)°, Z?=?2.     

Solid state structures of the chiral heterobimetallic complexes [Cu(dach)2][Pt(CN)4] · 2H2O, [Ni(dach)3][Pt(CN)4] · 2DMF · H2O,and [Pd(dach)2][Pt(CN)4] · H2O (dach = 1 R , 2 R -diaminocyclohexane)

The chiral dinuclear heterometallic complexes [Cu(dach)₂][Pt(CN)₄]?·?2H₂O (1), [Ni(dach)₃][Pt(CN)₄]?·?2DMF?·?H₂O (2), and [Pd(dach)₄][Pt(CN)₄]?·?H₂O (3) (dach?=?1R,2R-cyclohexanediamine) have been prepared and characterized by X-ray diffraction analysis. Crystal data: 1, monoclinic, P2₁, a?=?8.108(3), b?=?15.552(6), c?=?9.914(4)?Å, β?=?110.931(6)°, V?=?1167.6(8)?ų, Z?=?2, R ₁?=?0.0420, wR ₂?=?0.1122; 2, monoclinic, P2₁, a?=?13.264(11), b?=?9.285(7), c?=?16.211(13)?Å, β?=?111.640(9)°, V?=?1856(3)?ų, Z?=?2, R ₁?=?0.0276, wR ₂?=?0.0698; 3, monoclinic, P2₁, a?=?6.887(2), b?=?12.809(4), c?=?12.975(4)?Å, β?=?94.865(4)°, V?=?1140.6(6)?ų, Z?=?2, R ₁?=?0.057, wR ₂?=?0.156. In complex 1, the Pt and Cu atoms are linked by a CN bridge that presents a very bent C=N–Cu angle [136.8(8)°].     

Synthesis and structures of two cobalt complexes [NaCoII(NTA)(H2O)] n and NH4[CoIII(IDA)2] · 2H2O

Two cobalt complexes [NaCo^II(nta)(H₂O)] _n (H₃nta?=?nitrilotriacetic acid) (1) and NH₄[Co^III(ida)₂]?·?2H₂O (H₂ida?=?iminodiacetic acid) (2) have been synthesized and characterized by single-crystal X-ray diffraction analysis. Compound 1 crystallizes in the orthorhombic system, space group P2₁2₁2₁ with a?=?7.9770(12)?Å, b?=?9.7613(15)?Å, c?=?12.1945(18)?Å, V?=?949.5(2)?ų, Z?=?4, and R ₁?=?0.0705 for 1597 observed reflections. Compound 2 crystallizes in the monoclinic system, space group P2(1)/c with a?=?5.1801(3)?Å, b?=?11.2073(6)?Å, c?=?12.2891(7)?Å, V?=?707.09(7)?ų, Z?=?2, and R ₁?=?0.0349 for 1143 observed reflections. In compound 1, the Co is coordinated by a nitrogen and five oxygen atoms in a distorted octahedral geometry {CoNO₅}, and the Na is coordinated by one water molecule and four carboxyl oxygen atoms in slightly distorted square pyramidal geometry. The entire structure shows a three-dimensional network. In compound 2, Co atom is equatorially coordinated by two ida ligands in a distorted octahedral geometry {CoN₂O₄}. The discrete [Co(ida)₂]^2? anions are linked by hydrogen bonding to a three-dimensional supramolecular network.     

Hydrothermal synthesis and characterizations of a novel modular europium(III) coordination polymer bridged by biphenyl-2,2′-dicarboxylate dianions and 1,10-phenanthroline

A novel europium(III) coordination polymer, [Eu₂(bpdc)₃(phen)₂(H₂O)₂] _n ·nH₂O (1) (bpdc?= biphenyl-2,2′-dicarboxylate; phen?=?1,10-phenanthroline), has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction methods. Complex 1 is monoclinic, space group C2/c, with a?=?24.3862(6), b?=?12.0792(3), c?=?22.9120(5)?Å, α?=?90.00, β?=?115.160(1), γ?=?90.00°, V?=?6108.8(3)?ų, Z?=?4, final R ₁?=?0.0605 and wR ₂?=?0.1760. Each Eu(III) ion is coordinated by six oxygen atoms from three carboxylate groups of three different bpdc anions, an oxygen atom from one coordinated water molecule and two nitrogen atoms from one phen ligand to complete a deformed monocapped square antiprism. Each pair of bpdc anions acts as a tetradentate ligand to connect two adjacent Eu(III) ions through chelating carboxylate groups, resulting in a centrosymmetric binuclear unit. Each binuclear unit links two adjacent binuclear units through two terminal bpdc anions to produce a one-directional zigzag chain. Two different kinds of hydrogen-bonding interactions link the chains and the lattice water molecules to form a hydrogen-bonding network.     

Hydrothermal synthesis,crystal structure and third-order non-linear optical property of a copper chloride cluster

A novel one-dimensional chain coordination polymer [[CuCl₂]₂(phen)₂]_∞ (1) and a three-dimensional coordination polymer [[CuCl] (phen)₂](CuCl₂) (2) were synthesized from simple hydrothermal reactions and the structures were characterized with elemental analysis, FT-IR spectrum and X-ray diffraction. Compound 1 crystallized in the monoclinic space group Cc with a?=?9.874(2), b?=?17.871(4), and c?=?13.440(3)?Å, α?=?90.00°, β?=?106.59(3)°, γ?=?90.00°, R ₁?=?0.0463, wR ₂?=?0.0819. Compound 2 crystallized in the monoclinic space group P2/c with a?=?14.4084(13), b?=?12.6280(11) and c?=?13.3560(12)?Å, α?=?90.00°, β?=?111.490(2)°, γ?=?90.00°, R ₁?=?0.0771, wR ₂?=?0.1439. In the packing structure, π–π stacking interactions are the most significant factors controlling the novel supramolecular sheets for the title compound. Moreover, the third-order non-linear optical property of the two compounds were also investigated and they show reverse saturable absorption and self-focusing performance.     

Syntheses,crystal structures,and antimicrobial activities of nickel(II) and cadmium(II) complexes with 4-methylsulfonyl cinnamate and diamines

Two metal complexes, [Ni^II(mscinn)₂(pda)₂] (1) and [Cd^II(mscinn)₂(dmeda)₂·2H₂O] (2) (mscinn?=?4-methylsulfonyl cinnamate, pda?=?propane-1,3-diamine, dmeda?=?N′,N′-dimethylethane-1,2-diamine), were synthesized by reacting 4-methylsulfonyl cinnamate with the diamines and metal salts. Their structures were determined by single-crystal X-ray diffraction analysis. Crystal parameters of 1: C₂₆H₃₈N₄NiO₈S₂, M?=?657.43, monoclinic, P2₁/c, a?=?16.6123(8)?Å, b?=?8.5956(4)?Å, c?=?11.2047(5)?Å, β?=?107.423(1)°, V?=?1526.54(12)?ų, Z?=?2, D _calcd?=?1.430?g?cm^?3, F(000)?=?692, μ?=?0.825?mm^?1, R ₁?=?0.0257, wR ₂?=?0.0669. Crystal data of 2: C₂₈H₄₂CdN₄O₈S_2?·?2(H₂O), M?=?775.24, monoclinic, P2₁/c, a?=?9.8278(4)?Å, b?=?11.6611(5)?Å, c?=?15.3972(7)?Å, β?=?96.195(1)°, V?=?1754.26(13)?ų, Z?=?2, D _calcd?=?1.468?g?cm^?3, F(000)?=?804, μ?=?0.798?mm^?1, R ₁?=?0.0299, wR ₂?=?0.0770. Antimicrobial activities for 1 and 2 against Escherichia coli, Pseudomonas putida, Bacillus subtilis, and Bacillus cereus had better antibacterial activity than their parent carboxylic acid against Gram-positive bacteria (B. subtilis and B. cereus). The cadmium complex of the cinnamate displayed high inhibitory activity with an MIC value of 5?µg?mL^?1 against P. putida, while the nickel complex also exhibited good inhibitory potency with an MIC value of 5?µg?mL^?1 against B. subtilis.     

Hydrothermal synthesis and crystal structure of a novel luminescent europium complex of 2,5-pyridinedicarboxylic acid

A novel europium complex, Eu(Hdinic)(dinic)(H₂O)₅·4H₂O (dinic = 2,5-pyridinedicarboxylic acid), has been synthesized under hydrothermal conditions and characterized structurally by X-ray diffraction methods. The complex has a mononuclear molecular structure, is monoclinic, space group C2/c, with a?=?13.877(5), b?=?9.632(3), c?=?32.991(11)?Å, β?=?93.414(4)°, V?=?4402(2)?ų, D _c?=?1.948?Mg?m^?3, Z?=?8, F(000)?=?2576, R ₁?=?0.0320. Its photophysical properties are reported.     

Hydrothermal synthesis and characterization of two new arsenic–vanadate compounds with the same cluster anion [As8V14O42(H2O)]4−

Two new arsenic–vanadate compounds [Co(C₄H₁₃N₃)₂]₂[As₈V₁₄O₄₂(H₂O)]?·?3.5H₂O (1) and (C₂N₂H₉)₂(C₂N₂H₁₀)[As₈V₁₄O₄₂(H₂O)]?·?2.33H₂O (2) have been hydrothermally synthesized and characterized by X-ray single crystal diffraction, IR spectra and thermogravimetric analysis. Compound 1 crystallizes in the monoclinic space group P ₂(1)/c, a?=?24.649(9)?Å, b?=?13.364(5)?Å, c?=?22.463(8)?Å, β?=?104.008(5)°, V?=?7180(5)?ų, Z?=?4, R ₁?=?0.0787, and wR ₂?=?0.1859. Compound 2 crystallizes in rhombohedral system with space group R3c, a?=?b?=?c?=?22.2405(5)?Å, α?=?β?=?γ?=?110.4030(10)°, V?=?8163.4(3)?ų, Z?=?6, R ₁?=?0.0341 and wR ₂?=?0.0941. The structural analyses show that both compounds have the same discrete cluster anion [As₈V₁₄O₄₂(H₂O)]^4?. Moreover, in 1, the polyanions are connected through van der Waals forces to generate soft channels that are filled by [Co(C₄H₁₃N₃)₂]²⁺ cations and water. In 2, water and organic molecules link cluster anions to create the supramolecular assembly through hydrogen bonding.     

Synthesis,structure and characterization of copper(II) and zinc(II) complexes based on 3-carboxyl-1,2,4-triazole

Two complexes [CuL₂(H₂O)₂] (1) and [ZnL₂(H₂O)₂] (2) (L?=?3-carboxyl-1,2,4-triazole (L)) have been synthesized and characterized by single-crystal X-ray diffraction analysis. Compound 1 crystallizes in the monoclinic space group P ₂(1)/n, a?=?8.632(8)?Å, b?=?9.153(8)?Å, c?=?6.991(7)?Å, β?=?94.279(12)°, Z?=?2, R ₁?=?0.0296, wR ₂?=?0.0918. Compound 2 also crystallizes in the monoclinic space group P ₂(1)/n, a?=?4.937(3)?Å, b?=?18.107(10)?Å, c?=?6.344(4)?Å, β?=?106.839(7)°, Z?=?2, R ₁?=?0.0230, wR ₂?=?0.0556. Extensive intermolecular hydrogen bonds assemble 1 and 2 into three-dimensional (3D) supramolecular architectures, with eight-member H-bonded synthons. Compounds 1 and 2 were also characterized by element analysis, FT–IR, luminescence and EPR studies.     

Syntheses and structural determinations of the nine-coordinate rare earth metal: Na4[DyIII(dtpa)(H2O)]2·16H2O,Na[DyIII(edta)(H2O)3]·3.25H2O and Na3[DyIII(nta)2(H2O)]·5.5H2O

Three complexes, Na₄[Dy^III(dtpa)(H₂O)]₂?·?16H₂O, Na[Dy^III(edta)(H₂O)₃]?·?3.25H₂O and Na₃[Dy^III (nta)₂(H₂O)]?·?5.5H₂O, have been synthesized in aqueous solution and characterized by FT–IR, elemental analyses, TG–DTA and single-crystal X-ray diffraction. Na₄[Dy^III(dtpa)(H₂O)]₂?·?16H₂O crystallizes in the monoclinic system with P2₁/n space group, a?=?18.158(10)?Å, b?=?14.968(9)?Å, c?=?20.769(12)?Å, β?=?108.552(9)°, V?=?5351(5)?ų, Z?=?4, M?=?1517.87?g?mol^?1, D _c?=?1.879?g?cm^?3, μ?=?2.914?mm^?1, F(000)?=?3032, and its structure is refined to R ₁(F)?=?0.0500 for 9384 observed reflections [I?>?2σ(I)]. Na[Dy^III(edta)(H₂O)₃]?·?3.25H₂O crystallizes in the orthorhombic system with Fdd2 space group, a?=?19.338(7)?Å, b?=?35.378(13)?Å, c?=?12.137(5)?Å, β?=?90°, V?=?8303(5)?ų, Z?=?16, M?=?586.31?g?mol^?1, D _c?=?1.876?g?cm^?3, μ?=?3.690?mm^?1, F(000)?=?4632, and its structure is refined to R ₁(F)?=?0.0307 for 4027 observed reflections [I?>?2σ(I)]. Na₃[Dy^III(nta)₂(H₂O)]?·?5.5H₂O crystallizes in the orthorhombic system with Pccn space group, a?=?15.964(12)?Å, b?=?19.665(15)?Å, c?=?14.552(11)?Å, β?=?90°, V?=?4568(6)?ų, Z?=?8, M?=?724.81?g?mol^?1, D _c?=?2.102?g?cm^?3, μ?=?3.422?mm^?1, F(000)?=?2848, and its structure is refined to R ₁(F)?=?0.0449 for 4033 observed reflections [I?>?2?σ(I)]. The coordination polyhedra are tricapped trigonal prism for Na₄[Dy^III(dtpa)(H₂O)]₂?·?16H₂O and Na₃[Dy^III(nta)₂(H₂O)]?·?5.5H₂O, but monocapped square antiprism for Na[Dy^III(edta)(H₂O)₃]?·?3.25H₂O. The crystal structures of these three complexes are completely different from one another. The three-dimensional geometries of three polymers are 3-D layer-shaped structure for Na₄[Dy^III(dtpa)(H₂O)]₂?·?16H₂O, 1-D zigzag type structure for Na[Dy^III(edta)(H₂O)₃]?·?3.25H₂O and a 2-D parallelogram for Na₃[Dy^III(nta)₂(H₂O)]?·?5.5H₂O. According to thermal analyses, the collapsing temperatures are 356°C for Na₄[Dy^III(dtpa)(H₂O)]₂?·?16H₂O, 371°C for Na[Dy^III(edta)(H₂O)₃]?·?3.25H₂O and 387°C for Na₃[Dy^III(nta)₂(H₂O)]?·?5.5H₂O, which indicates that their crystal structures are very stable.     

Hydrothermal synthesis and crystal structure of a metal–organic compound with unique pseudo-hexagonal water channels: [CuII(phen)(sal)]·0.5H2O (phen=1,10-phenanthroline,sal=salicylic acid)

This article presents a metal–organic compound [Cu^II(phen)(sal)]?·?0.5H₂O (1) with intriguing structural motif of 3D hexagonal water channels. Furthermore, IR, element analysis, and TGA were employed to characterize it. The TG-DTA showed that this structure is stable to 300°C. Compound 1 belongs to the hexagonal system, space group R-3, a?=?33.337(5)?Å, b?=?33.337(5)?Å, c?=?9.4599(19)?Å, γ?=?120°, V?=?9105(3)?ų, Z?=?18.     

Hydrothermal synthesis,structures and characterization of two new copper(II) triphosphonate compounds

Two copper(II) triphosphonate compounds, Cu[(APTPH₄)(phen)(H₂O)]?·?2.16H₂O (1) and [Cu(APTPH₄)(2,2′-bipy)(H₂O)]?·?2.63H₂O (2), have been prepared by a low temperature hydrothermal reaction from 1-aminopropane-1,1,3-triphosphonic acid (APTPH₆), CuO and a second ligand, phen?=?1,10-phenanthroline, or 2,2′-bipy?=?2,2′-bipyridyl. These two compounds were characterized by single crystal X-ray diffraction, elemental analysis, IR and TG. Crystal data for 1: Monoclinic, space group P2₁ /c, a?=?14.4830(7)?Å, b?=?9.1721(5)?Å, c?=?16.7403(8)?Å, β?=?90.101(2)°. For compound 2: Triclinic, space group P 1, a?=?7.1215(7)?Å, b?=?10.460(2)?Å, c?=?14.671(2)?Å, α?=?82.983(2)°, β?=?83.882(2)°, γ?=?80.617(2)°. In both compounds, each Cu²⁺ ion is five-coordinate with two oxygen atoms from the triphosphonate, two nitrogen atoms from the second ligand and one water molecule, to form a distorted square-pyramidal geometry. Both complexes have 3D supramolecular structures constructed by hydrogen bonds and π–π stacking interactions.     

Two binuclear complexes containing the enrofloxacinate anion: Cd2(C19H21N3O3F)4(H2O)2 · 4H2O and Pb2(C19H21N3O3F)4 · 4H2O

The syntheses and crystal structures of the closely related but non-isostructural Cd₂(C₁₉H₂₁N₃O₃F)₄(H₂O)₂?·?4H₂O (1) and Pb₂(C₁₉H₂₁N₃O₃F)₄?·?4H₂O (2) are described, where C₁₉H₂₁N₃O₃F^? is enrofloxacinate (enro). Both compounds contain centrosymmetric, binuclear, neutral complexes incorporating a central diamond-shaped M₂O₂ (M?=?Cd, Pb) structural unit. The Cd²⁺ coordination polyhedron in 1 is a CdO₆ trigonal prism, including one coordinated water. The Pb²⁺ coordination polyhedron in 2 can be described as a very distorted square-based PbO₅ pyramid, although two additional short Pb?···?O (<3.1?Å) contacts are also present. In the crystal of the cadmium complex, O–H?···?O hydrogen bonds lead to a layered structure. In the lead compound, O–H?···?O and O–H?···?N interactions lead to chains in the crystal. Crystal data: 1: C₇₆H₉₆Cd₂F₄N₁₂O₁₈, M _r?=?1766.45, triclinic, P 1, a?=?12.185(2)?Å, b?=?12.306(3)?Å, c?=?14.826(3)?Å, α?=?68.15(3)°, β?=?70.28(3)°, γ?=?86.11(3)°, V?=?1938.2(7)?ų, Z?=?1, T?=?298 K, R(F)?=?0.030, wR(F ²)?=?0.079. 2: C₇₆H₈₈F₄N₁₂O₁₆Pb₂, M _r?=?1920.00, triclinic, P 1, a?=?12.0283(4)?Å, b?=?12.7465(4)?Å, c?=?13.0585(4)?Å, α?=?83.751(1)°, β?=?74.635(1)°, γ?=?81.502(1)°, V?=?1904.3(1)?ų, Z?=?1, T?=?298?K, R(F)?=?0.021, wR(F ²)?=?0.049.     

Two helical coordination polymers constructed from V-shaped and chelate ligands

The synthesis and X-ray characterization of two supramolecular isomers, [Co(oba)(2,2′-bpy)] _n (1 and 2) (oba?=?4,4′-oxybis(benzoate), 2,2′-bpy?=?2,2′-bipyridine) are reported. Crystal data for 1: a?=?12.026(2), b?=?15.120(3), c?=?11.361(2)?Å, β?=?91.46(3)°, Z?=?4, R ₁?=?0.0330, wR ₂?=?0.0949. Crystal data for 2: a?=?16.171(3), b?=?19.162(4), c?=?22.914(5)?Å, α?=?107.66(3), β?=?91.46(3), γ?=?98.99(3)°, Z?=?2, R ₁?=?0.0388, wR ₂?=?0.0456. They are conformational supramolecular isomers without solvent molecules in the structures, and exhibit different one-dimensional helical structures that are further assembled into distinct two-dimensional layers via π–π stacking interactions. The results indicate that the geometry of ligand is one of the most important factors for the construction of a helical motif.     

Hydrothermal synthesis,crystal structure and thermal stability of a new 2D layered metal(II) phosphonate: [NH3CH2CH2NH3][Fe2(O3PCH(OH)CO2)2(H2O)2]·2H2O

In the presence of ethylenediamine template agents, a metal(II) phosphonate, [NH₃CH₂CH₂NH₃][Fe₂(O₃PCH(OH)CO₂)₂(H₂O)₂]?·?2H₂O (1) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction as well as infrared spectroscopy, elemental analysis and thermogravimetric analysis. The compound crystallines in the monoclinic space group P2₁/n: Crystal data for 1: a?=?8.4523(8)?Å, b?=?9.8196(9)?Å, c?=?10.9217(10)?Å, β?=?105.9500(10)°, V?=?871.58(14)?Å, Z?=?2, D _c?=?2.103?g?cm^?3, R ₁?=?0.0290, wR ₂?=?0.0811. The Fe (II) cation is octahedrally coordinated by six oxygen atoms from the three ligands and one coordinated water molecule to form a 2D layered structure with a one-dimensional channel system in the a-axis direction.     

Syntheses,crystal structures and fluorescent properties of four one-dimensional lanthanide coordination polymers with 3-cyanobenzoato

The hydrothermal reactions of Nd(ClO₄)₃·6H₂O, Gd(ClO₄)₃·6H₂O, Dy(ClO₄)₃·6H₂O, Er(ClO₄)₃·6H₂O with 1,3-dicyanobenzene, give rise to four one-dimensional rare earth-based coordination polymers: [M(3-CNC₆H₄COO)₃(H₂O)₂] _n (where M?=?Nd (1), Gd (2), Dy (3), Er (4), 3-CNC₆H₄COO?=?3-cyanobenzoato), respectively. Their solid-state structures have been characterized by X-ray single-crystal diffraction studies. The results show that 1,3-dicyanobenzene hydrolyzed to give 3-cyanobenzoato under hydrothermal condition, and the four complexes are isomorphous. Crystal data for 1: triclinic, space group P-1, a?=?9.4063(19), b?=?11.485(2), c?=?12.616(3)?Å, α?=?66.38(3), β?=?74.01(3), γ?=?86.96(3)°, V?=?1197.9(4)?ų, Z?=?1, D _c?=?1.704?Mg?m^?3; for 2: triclinic, space group P-1, a?=?9.3712(19), b?=?11.446(2), c?=?12.627(3)?Å, α?=?65.86(3), β?=?73.89(3), γ?=?86.84(3)°, V?=?1184.8(4)?ų, Z?=?1, D _c?=?1.759?Mg?m^?3; for 3: triclinic, space group P-1, a?=?9.3425(19), b?=?11.432(2), c?=?12.703(3)?Å, α?=?65.28(3), β?=?73.80(3), γ?=?86.86(3)°, V?=?1180.6(4)?ų, Z?=?1, D _c?=?1.780?Mg?m^?3; for 4: triclinic, space group P-1, a?=?9.3425(19), b?=?11.432(2), c?=?12.703(3)?Å, α?=?65.28(3), β?=?73.80(3), γ?=?86.86(3)°, V?=?1180.6(4)?ų, Z?=?1, D _c?=?1.7794?Mg?m^?3. The fluorescence emission spectra of compounds 1 to 4 are also reported.     

Synthesis,spectra and crystal structure of a dinuclear manganese(χ) complex [(NTB)Mn(μ-O)]2(ClO4)4 · 2H2O

A novel dinuclear manganese(χ) complex [(NTB)Mn(μ-O)]₂(ClO₄)₄?·?2H₂O (1) (NTB?=?tris(2-benzimidazolylmethyl) amine) has been synthesized and characterized. The crystal structure is determined by single crystal X-ray diffraction. The compound crystallizes in the monoclinic system, space group C2/c with a?=?18.3461(1), b?=?15.4170(1), c?=?21.0141(1)?Å, β?=?90.5290(1)°, V?=?5943.4(8)?ų, Z?=?4 and R ₁?=?0.0789 for 5729 observed reflections. Two manganese atoms are bridged by two oxygen atoms forming a dinuclear complex. The results of interaction between 1 and H₂O₂ indicated that hydrogen peroxide destroyed the Mn₂O₂ unit of 1.     

Synthesis and structure of a three-dimensional lanthanide complex [Tm2(C5H3N(COO)2)3(H2O)3)]·H2O

A new three-dimensional complex [Tm₂(C₅H₃N(COO)₂)₃(H₂O)₃)]·H₂O (PDC?=?3,5-pyridinedicarboxylate), has been synthesized and its structure determined by x-ray single crystal diffraction methods. Complex 1 crystallizes in the monoclinic space group P2(1)/n with a?=?14.579(4), b?=?11.193(3), c?=?14.839(5)?Å, β?=?94.009(6)°, U?=?2415.5(13)?ų. Two independent PDC ligands bridge Tm^III ions from different orientations to form a network. Thermogravimetric analyses on compound 1 show its high structural stability to 410°C.