Synthesis,structure and properties of a new copper (II) complex, [Cu2(4,4′-bpy)5(H2O)4](ClO4)4(4,4′-bpy)(DMF)2(H2O)2

A new copper (II) complex with formula [Cu₂(4,4′-bpy)₅(H₂O)₄](ClO₄)₄(4,4′-bpy)(DMF)₂(H₂O)₂ has been synthesized by reaction of 4,4′-bpyridine (4,4′-bpy) with Cu(ClO₄)₂. While strong hydrogen bonds play central roles in the formation of the 3D structure, the combined influence of the weak interactions such as C–H?O bonds, anion?π and C–H?π interactions are also evident in the structure. The preliminary investigation on the thermal property of the complex is presented.     

Synthesis,structure and superoxide dismutase activity of a novel tetranuclear copper(II) complex Na2[Cu4Na2(TACNTA)4(H2O)6]·(H2O)26

A novel tetranuclear copper(II) complex Na₂[Cu₄Na₂(TACNTA)₄(H₂O)₆]·(H₂O)₂₆, where TACNTA is 1,4,7-triazacyclononane-1,4,7-triacetate, was synthesized and characterized by X-ray crystallography. The result shows that each copper(II) ion is six-coordinated to three nitrogen atoms and three oxygen atoms of ligand TACNTA and adopts distorted octahedral coordination geometry. The superoxide (·O₂^?) dismutation activity of the complex was also investigated by the riboflavin–methionine–nitro blue tetrazolium assay.     

CH⋯O,OH⋯O and π⋯π interactions in the crystal structure of a new heterotrinuclear macrocyclic complex, [MnII(NiIIL)2(C2H5OH)2](ClO4)2

The title complex was synthesized and characterized by X-ray crystallography. Mn^II ion is in a distorted octahedral environment. The coordination geometries around two Ni^II ions are completely same and are slightly distorted square planar. Mn^II and each Ni^II are bridged by an oxamido-group from one of the two macrocyclic ligands (L). CH⋯O, OH⋯O and π⋯π interactions link the trinuclear fragments and perchlorate ions to form a 3-D supramolecular architecture.     

Polyoxometalate chain-like polymer: the synthesis and crystal structure of a 1D compound, [Mo36O108(NO)4(MoO)2La2(H2O)28]n·56nH2O

Reaction of {Mo₃₆(NO)₄} with LaCl₃ in the presence of NH₂OH·HCl results in the formation of a novel chain-like polymer, [Mo₃₆O₁₀₈(NO)₄(MoO)₂La₂(H₂O)₂₈]_n·56nH₂O, in which the {Mo₃₆(NO)₄} units are linked to each other by two parallel La atoms.     

Crystal structure and catalytic studies of heterodinuclear complex [CuZn(μ-OAc)(μ-OH)(μ-OH2)(bpy)2](ClO4)2

The heterodinuclear copper–zinc complex [CuZn(μ-OAc)(μ-OH)(μ-OH₂)(bpy)₂](ClO₄)₂ has been synthesized from solid state reaction and its crystal structure was established. The heterobimetallic complex is quite efficient catalyst for hydrogen peroxide mediated oxidation of alcohols into corresponding carbonyl compounds.     

Synthesis,structure and dielectric properties of the first 1D Ba-tetrazole complex [Ba(4-TPA)2(H2O)4·3.5(H2O)]n

The first 1D Ba(II)-tetrazole coordination polymer, [Ba(4-TPA)₂(H₂O)₄·3.5(H₂O)]_n (1), which is constructed by a [BaO₂]_n inorganic skeleton chain with organic 4-TPA wings on both sides, has been synthesized and characterized by single crystal X-ray crystallography and temperature dependence dielectric constant (ε) measurement, (4-TPA = 2-(4-(1H-tetrazol-5-yl)pyridinium-1-yl) acetate). The ε of single crystal sample is almost twice the ε of powder sample. However, the dielectric loss of the crystal is relatively smaller, which is attributed to the highly ordered arrangement in crystal lattice.     

Synthesis,structure, and properties of two novel copper(II) complexes, [Cu(phen)(L)2]·6H2O and [Cu(phen)3]·(ClO4)2

Two novel copper(II) complexes, namely [Cu(phen)(L)₂]·6H₂O (1) and [Cu(phen)₃]·(ClO₄)₂ (2) have been synthesized under mild condition (HL = 5-methyl-1H-pyrazole-3-carboxylic acid, phen = 1,10-phenanthroline). We report the structural evidence of discrete water decamer conformation in the solid state. These units are found to act as supramolecular glue in the aggregation of mononuclear copper(II) complex to give a three-dimensional network through hydrogen-bonding. The preliminary investigation on the thermal behavior and the anion exchange property of the complexes are presented.     

Synthesis and crystal structure of [Cu(4-OOCC6H4CN)2(4-HOOCC6H4CN)(H2O)2]·2(4-HOOCC6H4CN): a hydrogen bonded assembly of the first transition metal complex of 4-cyanobenzoic acid

The first transition metal complex of 4-cyanobenzoic acid, [Cu(4-OOCC₆H₄CN)₂(4-HOOCC₆H₄CN)(H₂O)₂]·2(4-HOOCC₆H₄CN), has been prepared in aqueous medium. X-ray single crystal structure analysis reveals that it is a monometallic complex. Five-coordination Cu(II) ion is approximately in a square based pyramidal environment. Three-dimensional network of this compound is formed through O–H…N, O–H…O, C–H…O and C–H…N hydrogen bonding interactions, yielding a grid framework containing dimers of 4-cyanobenzoic acid with carboxylic dimer synthons locating in the channels.     

Two Tartrate-Pillared Coordination Polymers: Hydrothermal Preparation, Crystal Structures, Spectroscopic and Thermal Analyses of {[M2(μ-C4H4O6)2(H2O)] · 3H2O}∞ (M = Mn, Cd)

Two novel three-dimensional coordination polymers, formulated as {[M₂(μ-C₄H₄O₆)₂(H₂O)] · 3H₂O}_∞ (M = Mn for 1 and Cd for 2), have been synthesized under hydrothermal reaction condition. Both complexes were characterized by elemental analysis and IR spectroscopy. Their molecular and crystal structures were determined by X-ray crystal structure analysis and their thermal stability by TGA-DTA methods. Compound 1 crystallizes in the monoclinic space group, P2₁, while compound 2 crystallizes the orthorhombic space group, P2₁2₁2₁. The structures are self-assembled from bifunctional tartrate and water molecules. Tartrate ligands in 1 and 2 contribute to both covalent and hydrogen bonds. Polymeric chains of 1 and 2 are composed of M(II) ions bridged by tartrate ions in O,O′ fashion. The asymmetric units of coordination polymers contain two metal centers having different coordination environments.     

Synthesis,structural characterization and properties of a novel 1D helical chain arsenomolybdate {[Cu(en)2][Cu(en)(H2O)][(Cu(en)2(H2O)] [AsIIIAsVMo9O34)]} · 2H2O

An organic–inorganic hybrid 1D helical chain arsenomolybdate {[Cu(en)₂][Cu(en)(H₂O)][(Cu(en)₂(H₂O)] [As^IIIAs^VMo₉O₃₄)]} · 2H₂O (1) (en = ethylenediamine) has been hydrothermally synthesized and characterized by elemental analyses, IR, UV and CD spectrum, powder X-ray diffraction, TG-DTA and single-crystal X-ray diffraction. The asymmetric unit of 1 consists of a monocapped trivacant Keggin [As^IIIAs^VMo₉O₃₄]^6 − subunit, a pendant [Cu(en)₂(H₂O)]^2 + cation, a pendant [Cu(en)(H₂O)]^2 + cation, one bridging [Cu(en)₂]^2 + cation and two lattice water molecules. It should be noted that 1 illustrates a one-dimensional (1D) helical chain assembled by {[Cu(en)(H₂O)][(Cu(en)₂(H₂O)][As^IIIAs^VMo₉O₃₄)]}^2 − clusters and [Cu(en)₂]^2 + linkers.     

Synthesis,characterization and catalytic properties of a copper complex containing decavanadate nanocluster,Na2[Cu(H2O)6]2{V10O28}·4H2O

A copper complex containing decavanadate nanocluster, Na₂[Cu(H₂O)₆]₂{V₁₀O₂₈}·4H₂O, was prepared by reaction of Cu(NO₃)₂·4H₂O and NH₄VO₃ in an aqueous solution at pH = 4 and its structure was characterized using IR, CV and X-ray crystallography. It was found to be a highly efficient and effective catalyst for the azide alkyne cycloaddition and one-pot three-component (A³) coupling of aldehydes, amines, and alkynes to produce 1,2,3-triazoles and propargylamines respectively in high yields without any co-catalyst or activator.     

Mixed solvothermal synthesis and X-ray characterization of a layered copper coordination polymer,Cu(H2O)(1,3-BDC) · H2O (BDC=benzenedicarboxylate)

A novel copper coordination polymer, Cu(H₂O)(1,3-BDC) · H₂O was synthesized by a mixed solvothermal reaction of cupric acetate with 1,3-BDC and characterized by single-crystal X-ray diffraction. This compound crystallizes in a tetragonal space group P4/nmm with cell parameters a=19.1411(5) Å, c=6.7881(2) Å, and Z=8. Its structure contains paddle-wheel-like bi-copper clusters with the pseudo-octahedral centers of Cu(II) ion, Cu₂O₈(H₂O)₂. Every 1,3-BDC fragment links two such clusters to yield a two-dimensional open structure. It was also characterized by infrared spectroscopy, elemental analysis, inductively coupled plasma analysis, differential thermal and thermal gravimetric analyses.     

Hydrothermal synthesis,crystal structure,spectroscopy, electrochemistry and antimycobacterial evaluation of the copper (II) ciprofloxacin complex: [Cu(cf)2(BF4)2]·6H2O

The hydrothermal reaction of ciprofloxacin (1) with Cu(BF₄)₂·6H₂O yields a copper complex having a molecular formula, [Cu(cf)₂(BF₄)₂]·6H₂O (cf = ciprofloxacin), which is characterized by spectroscopic and electrochemical measurements as well as single crystal X-ray studies [a=9.1079(13), b=9.6112(16), c=11.4542(18) Å, α=90.518 (19)°, β=99.160 (18)°, γ=93.315 (19)°, P1bar, Z=1]. The F₂O₄ donor atom set forms a (4+2) distorted octahedral geometry around the central copper atom; which has a highly facile copper redox couple (+0.23 V). The copper conjugate exhibits a significant enhancement in the antitubercular activity probably arising out of its rapid intracellular reduction leading to oxygen activation, which is detrimental to the mycobacteria.     

Synthesis and structure of a supramolecular octanuclear Cu(II) complex {[Cu(sae)]42CH3OH·H2O}2 through both μ-oxo and hydrogen bonds (sae = 2-salicylideneamino-1-ethanol)

A new supramolecular octanuclear copper(II) complex, {[Cu(sae)]₄2CH₃OH·H₂O}₂, has been synthesized and structurally characterized. The structure of the complex consists of two tetracopper(II) cubane units related by hydrogen bonds.     

Hydrothermal synthesis, crystal structure and properties of complex [Co (odpa) (phen) 2 ( H2O )] · H2O

以4,4’-氧化二苯四羧酸二酐和1,10-邻菲啰啉为配体在水热条件下合成了标题配合物,并用元素分析、红外光谱、X-射线单晶衍射以及热重分析对配合物进行了表征.晶体结构分析表明配合物为三斜晶系,P-1空间群a=11.190(2)(A),b=12.587(2) (A),c=13.097(3)(A),α=102.688(3)°,β=105.751(2)°,γ =92.615(2)°,V =1721.1(6)A3,Z=2.配合物为单核结构,相邻的单核分子通过氢键的识别作用形成一维超分子双链.π…π堆积作用和C-H…π之间弱相互作用将邻近超分子双链的进一步扩展为三维超分子结构.     

Hydrothermal synthesis,crystal structure and physical properties of {[Gd(H2O)4(μ2-C6NO2H5)2Gd(H2O)4](μ3-C6NO2H4)2(ZnCl3)2} · 2H2O · 2Cl

A bimetallic 4f–3d tetranuclear complex {[Gd(H₂O)₄(μ₂-C₆NO₂H₅)₂Gd(H₂O)₄](μ₃-C₆NO₂H₄)₂(ZnCl₃)₂} · 2H₂O · 2Cl (1) has been synthesized via hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Complex 1 is characterized by a tetranuclear Gd₂Zn₂ structure with the gadolinium and zinc atoms interconnected by isonicotinic acid ligands. The tetranuclear species of {[Gd(H₂O)₄(μ₂-C₆NO₂H₅)₂Gd(H₂O)₄](μ₃-C₆NO₂H₄)₂(ZnCl₃)₂} link to isolated chlorine ions and water molecules via π?π interactions and hydrogen bonds to yield a 3-D supramolecular framework. Photoluminescent investigation reveals that the title complex displays an emission in ultraviolet region. The solid-state diffuse reflectance spectra of 1 reveal the presence of a sharp optical gap of 3.66 eV.     

Synthesis,characterization and sorption properties of a porous coordination polymer: Co3(citrate)2(4,4′-bipyridine)4(H2O)2·4(H2O)

A porous coordination polymer, Co₃(citrate)₂(4,4^′-bipyridine)₄(H₂O)₂·4(H₂O) has been synthesized and characterized. It adopts a 3-D framework, built up by parallel [Co₃(citrate)₂]_n chains cross-linked by 4,4^′-bipyridine ligands. The connection leads to hydrophilic cavities filled with water molecules, which interact with the citrate ligands through hydrogen bonds. Dangling 4,4^′-bipyridine ligands are observed in the structure, pointing to cavities. Two equivalents of coordination water and four equivalents of crystallization water molecules can be removed reversibly based on TGA studies.