A novel 2D herringbone-like zinc coordination polymer built from helical motif: Hydrothermal synthesis,structure and properties

A novel coordination polymer [Zn(4,4′-bipyridine)(Hptc) · H₂O]_n (H₃ptc=pyridine-2,4,6-tricarboxylic acid) (1) was obtained via hydrothermal method and characterized by elemental analyses, IR spectrum, TG analysis, luminescent spectrum and single-crystal X-ray diffraction analysis. Single-crystal structural analysis reveals that the center Zn²⁺ions are linked by bridging – carboxylate group of H₃ptc, to form helix. The winding axes parallel to the b axis and the pitch to the length is 7.147 Å. Two kinds (one is left handed and the other is right handed) of parallel helices existed correspondingly, which are connected by rigid 4,4′-bipyridine ligand to give a 2D puckered herringbone structural motif.     

Hydrothermal synthesis and characterization of a copper(I) halide coordination polymer with isonicotinic acid (IN) ligand as a template possessing three-dimensional supramolecular network structure

The title compound [CuBr(IN)]_n 1 was hydrothermally synthesized from a simple reaction of CuBr₂–IN–KBr–NaOH–H₂O. X-ray analysis revealed that it is a new example containing extended one-dimensional staircase chain in copper(I) halide family. Its structure can be better described as a three-dimensional supramolecular network assembled via a combination of coordinate–covalent bonds and intermolecular hydrogen bonds. Moreover, compound 1 was characterized by elemental analysis, IR spectrum and TGA analysis.     

Synthesis and crystal structure of a novel zinc(II) coordination polymer with mixed ferrocenyl diketone and bipyridine ligands

A novel zinc(II) coordination polymer [Zn(fca)₂(bpe)]_n·2nH₂O (bpe=1,2-bis(4-pyridyl)ethene, fca=C₅H₅FeC₅H₄C(OH)CHCOCH₃) was obtained by the reaction of Zn(OAc)₂·2H₂O with bpe and 1-ferrocenylbutane-1,3-dione (ferrocenoylacetone, Hfca) in methanol solution. X-ray structural analysis reveals that the compound contains two kinds of ligands: one is the 1,2-bis(4-pyridyl)ethene ligand, directly bridging zinc(II) centers to form a one-dimensional chain [Zn(bpe)]_n, the other is the enolized ferrocenylacetone chelating the central ion. The zinc(II) ion is in an elongated octahedral environment with four oxygen atoms from two distinct enolized ferrocenoylacetone, two nitrogen atoms of the bridging 1,2-bis(4-pyridyl)ethene ligands.     

Synthesis,crystal structure and desulfurization properties of zig-zag 1D coordination polymer of copper(II) containing 4-methoxybenzoic acid ligand

ABSTRACT

Combustion of fuels containing organosulfur compounds has resulted in the emission of sulfur oxides (SO_x) into the atmosphere, therefore, causing serious environmental and health hazards. Herein, slightly distorted octahedral zig-zag 1D coordination polymer of copper(II) [Cu(4-mba)₂(H₂O)₃] was synthesized by reacting copper sulfate pentahydrate with a carboxylate-containing ligand (H-4mba?=?4-methoxybenzoic acid) and employed for sulfur compound uptake. The ligand coordinates to the copper(II) atom via two pairs of deprotonated ligating atoms (carboxylate oxygens) and two water molecules. Structural characterization also reveals that interplay of O–H···O, N–H···O, C-H···O and C–H···π interactions between lattice and coordinated water and ligands significantly contribute to the crystal packing leading to the formation and strengthening of three-dimensional supramolecular assembly. The complex, [Cu(4-mba)₂(H₂O)₃], show potential for desulfurization of fuel with an observed adsorption capacity of 9.6?mg/g at 32°C for 6?h. DFT calculations further revealed a transfer of electron sulfur-containing compounds and the complex, [Cu(4-mba)₂(H₂O)₃], thus leading to a stronger pi–pi interaction.     

Hydrothermal synthesis and crystal structure of a novel Keggin polyoxoanion-templated multichain coordination polymer with a flexible bis(imidazole) ligand

By introducing the flexible 1,1′-(1,4-butanediyl)bis(imidazole) (bbi) ligand into the Keggin system, a novel multi-chain compound, (bbi)_1.5[Cu(bbi)]_4.5[PW₁₂O₄₀]_1.5 (1) was synthesized under the hydrothermal conditions. It was characterized by elemental and TG analysis, IR and XPS spectra, cyclic voltammetry, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. Compound 1 features in two sorts of polyoxometalates (POMs) chains, the poly-chain of [Cu(bbi)]_4.5[PW₁₂O₄₀] and the single-chain of (bbi)[PW₁₂O₄₀]_0.5, induced by the POM clusters.     

Hydrothermal synthesis,crystal structure and spectroscopic properties of a novel 3D chromium(III) complex

The hydrothermal synthesis of CrCl₃·6H₂O, NaOH, 2,6-dipicolinic acid (H₂dpa), salicylic acid (HSAL) in water and ethanol at 140 °C for 5 days yields a novel 3D coordination polymer NaCr(C₇H₃O₄N)₂(H₂O)₂ (1). In the complex, each Cr center is in a distorted octahedral environment, and coordinates to two nearly perpendicular dpa anions, which act as tridentate ligands. Na(I) is in a compact sixfold coordination with three non-coordination carbonyl oxygen atoms of neighboring asymmetric units, a carboxylate oxygen atom shares coordination with Cr(III) and two aqueous. Two adjacent asymmetric units are linked together through Na–O and a set of intermolecular hydrogen bonds, which generates the finally 3D supermolecular network structure.     

Hydrothermal synthesis,crystal structure,and thermal stability of a novel 3D cadmium phosphonate with double-stranded helical channels

In the presence of ethylenediamine template agents, a novel 3D cadmium phosphonate with double-stranded helical channels, [enH₂]_0.5[Cd₂(HL)(L)] 1(H₃L =  2-hydroxyphosphonoacetic acid; en = ethylenediamine) has been synthesized by hydrothermal reaction at 140 °C and characterized by single-crystal X-ray diffraction as well as by infrared spectroscopy, elemental and thermogravimetric analysis. The structure of compound 1 comprises right-handed double-stranded helical channels, left-handed double-stranded helical channels and achiral channels that are connected through cadmium atoms and L³⁻ligands to form a meso compound, and the protonated ethylenediamine cations are located inside the achiral channels.     

Synthesis,crystal structure and fluorescence of a new triazolated-bridged 2-D coordination polymer

In the 2-D coordination polymer [Zn(L)Cl]_n (HL = 3-amino-1H-1,2,4-triazole) synthesized by diffusion method, L⁻ ligands link Zn²⁺ to form 6- and 16-membered rings. The interconnection of the two kinds of rings results in a 2-D network, which features a (4,8²) topological network. Hydrogen bonds connect the neighboring plane-symmetry layers into a 3-D framework. The fluorescence with emission at 416 nm is assigned to LMCT.     

Synthesis and crystal structure of a novel two-dimensional corrugated coordination polymer

Assembly of 4-aminosalicyclic acid (H₂L) and Ag(I) in MeCN/H₂O gave rise to a novel corrugated sheet polymer {[Ag(HL⁻)]·H₂O}_n. X-ray structural analysis reveals that Ag(I) is coordinated by three different HL⁻ ligands in a distorted trigonal geometry and HL⁻ links three different Ag(I) in a μ₃-bridge mode forming a two-dimensional sheet structure with curvature. The separation of the carboxylate-bridged Ag⋯Ag and the distance of adjacent sheets are 2.7720(6) and 4.24 Å, respectively.     

Synthesis,crystal structure and photoluminescent properties of a 3D Zn(II) coordination polymer

A new 3D coordination polymer [NH₂(CH₃)₂]₂[Zn₇L₄(DMF)₂(H₂O)₃]·19H₂O (1) (L = 2,3′,5,5′-biphenyl tetracarboxylic acid) has been solvothermally synthesized and structurally characterized by IR, elemental analysis and single-crystal X-ray diffraction. Single-crystal X-ray diffraction studies indicate that 1 exhibits 3D framework with a one-dimensional (1D) channel. The luminescence properties have been studied, and the results showed that 1 displays strong fluorescent emissions both in the solid state and in methanol suspension at room temperature. More interesting, the addition of Fe^3 + causes the fluorescence intensity of 1 to be weakened, which implies that it may be used as luminescent probes of Fe^3 +.     

Solvothermal synthesis and crystal structure of a luminescent 2D copper(I) coordination polymer with a (3,4)-connected net

A novel copper(I) coordination polymer, {[Cu(tpt)(MeCN)](ClO₄)}_∞ (1) (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine), was synthesized by solvothermal synthesis method and structurally characterized. Single crystal X-ray diffraction showed that 1 consists of a 2D (3,4)-connected network with a unique (5³)₂(5⁴8²) topology. The luminescent properties of 1 in the solid state at ambient temperature were investigated.     

一维链状均苯三酸锌配合物[Zn_3(BTC)_3(H_2O)_(12)]_n的水热合成及晶体结构研究

以Zn(CH3COO)2和均苯三酸(1,3,5-苯三酸)为原料,采用水热法合成了一维链状均苯三酸锌配合物[Zn3-(BTC)3(H2O)12]n,利用元素分析、X射线单晶衍射对其结构进行了表征。该配合物属于单斜晶系,C2空间群,a=17.424(5)nm,b=12.919(5)nm,c=6.577(5)nm,β=111.968(5)°,V=1.373 0(12)nm3,Z=2,Dc=1.999 g/cm3,μ=2.707 mm-1,F(000)=840,R1=0.031 5,wR2=0.078 9。     

A novel europium coordination polymer based on mixed carboxylic acid ligands: Synthesis,structure and luminescence

A novel europium complex, formulated as {[Eu₄(H₃Pimda)₄ (Himba)₂·4H₂O]·4H₂O}_n (1) (H₃Pimda = 2-propyl-1H-imidazole-4,5-dicarboxy acid, and Himba = 4-(1H-imidazole-1-ly) benzoic acid), has been obtained by the hydrothermal reaction. Single crystal X-ray diffraction analysis shows that complex 1 exhibits one-dimensional (1-D) ribbon-double chain composed of tetranuclear europium clusters, and these chains are further linked by Himba ligands into the 2-D corrugated layer arrays. Complex 1 exhibits efficiently sensitized red luminescence in visible region in N,N-dimethyl formamide (DMF) based on characterization emission of europium(III) ion. When Cd(NO₃)₂ is dropped in the DMF suspension of 1, the luminescence intensity increases linearly, rapidly, which indicates it may be employed as a fluorescent ratiometric probe for detection pollutant Cd(II) anion. In addition, complex 1 is characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis and PXRD measurement.     

Synthesis and characterization of a novel 2D zinc(II) coordination polymer

Under hydrothermal conditions, NaN₃, 4-[²H₇]methylbenzonitrile, reacted with Zn(NO₃)₂ to give a 2D layered network complex [Zn(4-MPTZ-[²H₇])₂] (1) [4-MPTZ = 5-(4-methylphenyl)tetrazole]. Single crystal X-ray determination shows that complex 1 consists of two Zn atoms and six tetrazolyl ligands in the crystallographically asymmetric unit with orthorhombic space group Pbcn, each Zn center is linked to three other Zn centers through the bridging ligands. And the dielectric constants of 1 were measured at different temperature, and deuterated effect at the lowest frequency (10⁴ Hz) can be estimated to increase 33% at 290 K which was never seen before in the isotope effect.     

Hydrothermal synthesis,crystal structure and electrochemical property of a novel 3-D microporous reduced molybdophosphate with large cavities

A novel molybdenum phosphate based on [Mo₆P₄] inorganic subunits and [Mn(H₂O)₂]²⁺ cations, Mn[Mo₆O₁₂(OH)₃(PO₄)(HPO₄)₂(H₂PO₄)]₂[Mn(H₂O)₂]₂(Hen)₄·13H₂O (en = ethyl enediamine), has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectroscopy, EPR spectrum and TGA analysis. The 3-D framework of the compound contains microporous structure with large cavities filled by mono-protonated Hen⁺ and water molecules. The electrochemical behavior of the compound has been also studied.     

Two 3D coordination complexes containing metal-triazolate helical chains: Synthesis,structure, fluorescence and NLO properties

Two three-dimensional coordinationcomplexes containing metal-triazolate helical chains wereobtained. Their fluorescent andnonlinear optical properties were explored.

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Solvothermal synthesis,crystal structure and photoluminescent property of a novel 3D cadmium(II) coordination polymer containing [Cd5(μ3-OH)2(μ3-OAc)2]6+ cores

A novel 3D coordination polymer, {[Cd₅(μ₃-OAc)₂(μ₂-OAc)₂(μ₃- OH)₂(pam)₂(4,4′-bpy)₂] · CH₃CH₂OH}_n (1) (H₂pam = pamoic acid, HOAc = acetic acid, 4,4′-bpy = 4,4′-bipyridyl), was solvothermally synthesized and characterized by the single crystal X-ray diffraction. The title compound contains unprecedented [Cd₅(μ₃-OH)₂(μ₃-OAc)₂]⁶⁺ pentanuclear building units which are linked through pam and 4,4′-bpy ligands to afford a three-dimensional structure. The infrared spectroscopy, thermal stability and photoluminescence of the complex were studied.