共查询到20条相似文献,搜索用时 15 毫秒
1.
M. L. Wei P. F. Zhuang R. P. Sun H. H. Li 《Russian Journal of Coordination Chemistry》2011,37(1):30-35
A new organometallic-inorganic hybrid compound {[Mn(L)2]2[PMo12O40][NO3] · 4CH3OH · 3H2O} n (I), where L is 1,4-bis(4-imidazolyl)-2,3-diaza-1,3-butadiene) was synthesized in situ from [PMo12O40]3?, Mn2+ and L reaction in an H2O-DMSO-CH3OH mixture at room temperature, and the product was structurally characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction analysis. Compound I is constructed from alternating layers of the metal-Schiff-base cation and Keggin anions based on electrostatic forces and hydrogen bond interactions. 相似文献
2.
Ai-Xiang Tian Yan Tian Huai-Ping Ni Xue-Bin Ji Ya-Li Ning Xue Hou 《Journal of Coordination Chemistry》2016,69(19):2855-2863
Two new inorganic-organic hybrid compounds based on α-Keggin clusters and Ag-(1H-Pyrazole) subunits, [AgL2]4[SiMo12O40] (1) and [AgL2]3[PMo12O40] (2) (L = pyrazole), have been synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction. In 1, there are two kinds of chains, the chains linked by two [AgL2]+ clusters and the other linked only by one [AgL2]+, which further connect by sharing [SiMo12O40]4? anions to construct a 2-D layer. In 2, four-supporting [PMo12O40]3? anions are fused by [Ag(1)L2]+ subunits to form a 1-D chain. Through weak interactions of Ag?O (3.091 Å) a 2-D supramolecular layer is constructed. Additionally, the electrochemical properties of title compounds and the photocatalytic properties of 2 have been studied. 相似文献
3.
Jun Ying Ting-Ting Li Jia-Ni Liu Yan Tian Huai-Ping Ni Xue-Bin Ji 《Journal of Coordination Chemistry》2017,70(11):1872-1881
Two new organic–inorganic hybrid compounds, [CuII(btb)1.5(γ-Mo8O26)0.5(H2O)]·2H2O (1) and [CuII2(btb)4(PMoVMoVI11O40)]·2H2O (2) (btb = 4-butyl-1,4-bis(1,2,4-triazole), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis, IR spectra and elemental analyses. In 1, there exists a ladder-like metal-organic chain with the bidentate [γ-Mo8O26]4? anions inserting into the grids. Adjacent chains share the same Cu-btb lines of the ladder to form a 2-D layer. Compound 2 also has a ladder-like metal-organic chain. The tetradentate [PMo12O40]3? anions embed in the grids. The same Cu-btb line is shared by adjacent chains to build a 2-D layer. The btb ligands link adjacent layers to form a 3-D framework. Moreover, we also have investigated the electrochemical and photocatalytic properties of 1 and 2. 相似文献
4.
《Journal of Coordination Chemistry》2012,65(3):522-532
Three supramolecular compounds based on [P2Mo5O23]6? and Ni(II)–bim, [Ni(bim)3]3[P2Mo5O23]·2H2O (1), [Ni(Hbim)(bim)2]4[P2Mo5O23]2·3H2O (2), and [Ni(bim)(Hbim)(phen)]2[P2Mo5O23]·7H2O (3) (bim?=?2,2′-biimidazole, phen?=?1,10-phenanthroline), have been synthesized under hydrothermal conditions and characterized by elemental analysis, single-crystal X-ray diffraction, IR, and TG. All the compounds show 3-D supramolecular networks constructed from weak interactions among free Ni(II) complex, water, and oxygens of [P2Mo5O23]6?. Compound 3 represents the first supramolecular example integrating {Ni(bim)(Hbim)(phen)} with Strandberg-type phosphomolybdate. The compounds display good electrocatalytic activity to reduce hydrogen peroxide and intense fluorescence properties in solution at room temperature. 相似文献
5.
Jing Chen Zhen-yu Shi Ai-xiang Tian Peng-peng Zhang 《Journal of Molecular Structure》2009,917(1):10-77
Two new supramolecular assemblies based on Keggin-type polyoxometalates, [Ag3(4,4′-bipy)2(2,2′-bipy)2][Ag(2,2′-bipy)2][{Ag(2,2′-bipy)}HSiW11VO40] (1) and [Ag3(4,4′-bipy)2(2,2′-bipy)2][Ag(2,2′-bipy)2][{Ag(2,2′-bipy)}PW11VO40] (2) (4,4′-bipy = 4,4′-bipyridine, 2,2′-bipy = 2,2′-bipyridine), have been synthesized under the hydrothermal conditions and structurally characterized by IR, XPS, TG and single-crystal X-ray diffraction. Compound 1 has a 2D layer network structure via weak Ag...O interactions. Compound 2 is isostructural with compound 1. In addition, the fluorescence of compound 1 is reported. 相似文献
6.
Quan-Zheng Zhang Can-Zhong Lu Wen-Bin Yang Chuan-De Wu Ya-Qin Yu Ying Yan Jiu-Hui Liu Xiang He 《Journal of Cluster Science》2003,14(3):381-390
Two Keggin-type heteropolyanions were synthesized and characterized by X-ray crystal structure and elemental analysis as well as infrared spectroscopy. Both K3[VMo12O40]19H2O (1) and [N
i
(H2O)6][H3PMoVMoVI
11O40]230 H2O (2) were prepared in aqueous solution. Compound 1 crystallized in the space group Pm-3m, a=10.6513(1) Å, V=1208.4(3) Å3, Z=1. Compound 2 crystallized in the space group R-3 with a=b=13.9669(2) Å, c=42.0075(5) Å, V=7096.71(2) Å3, Z=3. The compound 1 contains a {K6VMo12O40} group in which six potassium ions form a regular {K6} octahedron. The heteropolyanion [VMo12O40]3– was capped by six potassium ions and enclosed by {K6} octahedron. A three-dimensional structure was formed by the buildup of {K3[VMo12O40]}
n
. Compound 2 contains a one-electron reduced heteropolyanion [H3PMoVMoVI
11O40]1–. Ni2+ coordinated by six water molecules as the counter cation balances the negative charge of the molecule. 相似文献
7.
A new supramolecular compound, {[Cd(L)2]2[PMo12O40NO3]·CH3CN·2H2O}n 1 (L is 1,4-bis(4-imidazolyl)-2,3-diaza-1,3-butadiene), based on Cd(II)-Schiff-base and Keggin- type [PMo12O40]3- was synthesized via self-assembly and structurally characterized by elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1 with a = 12.0128(11), b = 13.6196(13), c = 13.9995(13) , α = 103.868(2), β = 95.225(2), γ = 101.024(2)°, V = 2160.0(3) 3, Z = 1, C34H39N26O45Cd2Mo12P, Mr = 2938.96, Dc = 2.259 g/cm3, μ = 2.276 mm-1, F(000) = 1400, the final R = 0.0565 and wR = 0.1613 for 4973 observed reflections with I 2σ(I). The crystal structure can be described by the packing of Keggin anionic and Metal-Schiff-base cationic layers. 相似文献
8.
Two coordination polymers (CPs) based on Keggin-type [SiW12O40]4– (SiW12), [Zn2(bpy)2(SiW12O40)(DMF)8]·solvent (1) and [Zn2(bpy)(SiW12O40)(DMA)8]·2DMA (2) (bpy = 4,4′-bipyridine, DMF?=?N,N′-dimethylformamide; DMA?=?N,N′-dimethylacetamide), have been solvo-thermally synthesized and characterized by single crystal X-ray diffraction, powder X-ray diffraction, IR spectra, elemental analyses and thermogravimetric analyses. Both 1 and 2 are synthesized under similar conditions except DMF and DMA were used as the solvents for 1 and 2, respectively. Structural studies reveal that the supramolecular framework of 1 contains pumpkin-like voids, while 2 has a non-porous supramolecular framework. These results show that solvents play an important role in construction of the POM-based CPs. The luminescent properties for 1 and 2 have also been investigated. 相似文献
9.
[Co(phen)3]2[PMo12O40](OH)的水热合成及晶体结构 总被引:1,自引:0,他引:1
利用水热合成法制备了Keggin结构阴离子有机一无机复合物[Co(phen)3]2[PMo12O40](OH),通过元素分析,红外光谱和X射线单晶衍射等对其进行了表征.结果表明,该化合物属于单斜晶系,C2/c空间群.=1.97225(18)nm,b=1.81079(16)nm,c=2.5117(2)nm,β=100.5380(10)°,V=8.819O(14)nm^3,Z=4,R1=0.0587,wR2=0.1211.该化合物分子由一个多阴离子[PMo12O40]^3-,两个[Co(phen)3]^2+及一个羟基组成. 相似文献
10.
The title compound H3[PMo12O40]· 3C2H6O was prepared and characterized by X-ray crystallography, its i.r. spectrum, cyclic voltammetry and e.s.r. spectra. The anion of the title compound is a Keggin-type heteropoly structure based upon a central PO4 tetrahedron surrounded by 12 MoO6 octahedra arranged in four groups of three edge-shared octahedra Mo3O13. Weak hydrogen bonds exist between the organic solvent molecules and the heteropoly anion. The catalytic activity of the title compound was determined by the synthesis of butyl acetate. The conversion of n-BuOH reached 93.3% and the yield of MeCO2Bu-n was 92.0% when the ratio of MeCO2H to n-BuOH, catalyst amount, reaction time, reaction temperature were 2:1, 0.24% of the reactants (50 mg), 2.0 h and 115 120 °C, respectively. 相似文献
11.
Peng-peng Zhang Jun Peng Hai-jun Pang Yuan Chen Min Zhu Dan-dan Wang Ming-guan Liu Yong-hui Wang 《Solid State Sciences》2010,12(9):1585-1592
Two couples of new compounds templated by the polyanion [SiW12O40]4?,[Hbix][CuI(bix)]3[SiW12O40]·4H2O (1) and [CuII(H2O)(Hbix)2(bix)]2[CuII(H2O)2(Hbix)2(bix)][SiW12O40]3·4H2O (2) (bix = 1,4-Bis(imidazol-1-ylmethyl)benzene), [CuI(bbi)]4[SiW12O40]·2H2O (3) and [CuII(bbi2)]2[SiW12O40] (4) (bbi = 1,1′-(1,4-butanediyl)bis(imidazole)) were hydrothermally synthesized, and characterized by elemental analyses, IR spectroscopy, thermogravimetric analyses and single X-ray diffraction. Compounds 1 and 2 were synthesized from the same reactants but exhibited distinct structures which could be ascribed to the different ratios of the reactant bix to CuII. In compound 1, the higher ratio of bix results in the transformation of the CuII to CuI, the [SiW12O40]4? templates direct the CuI–bix coordination polymers to form a 3D supramolecular framework with grid-like channels along two directions. The [SiW12O40]4? templates in compound 2 locate in the voids of the 3D supramolecular network constructed by CuII–bix coordination polymers, which exhibits the interdigitation fashion in both the formation of the 2D layer and the 3D framework. Compounds 3 and 4 were synthesized similar to 1 and 2, except for the change of bix to bbi. In compound 3, the CuI–bbi polymers form a supramolecular metal–organic host framework with rhombic channels in which the SiW12 templates reside. Compound 4 shows a framework with hexagonal channels constructed by CuII–bbi coordination polymers which accommodated the SiW12 templates. 相似文献
12.
Hanbin Hu Yixin Yang Xiao Jiang Jiaxin Wang Dongwei Cao Lei He Wei Chen Prof. Dr. Yu-Fei Song 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(53):13367-13375
Polyoxometalates (POMs)-based materials, with high theoretical capacities and abundant reversible multi-electron redox properties, are considered as promising candidates in lithium-ion storage. However, the poor electronic conductivity, low specific surface area and high solubility in the electrolyte limited their practical applications. Herein, a double-shelled hollow PMo12−SiO2@N−C nanofiber (PMo12−SiO2@N−C, where PMo12 is [PMo12O40]3−, N−C is nitrogen-doped carbon) was fabricated for the first time by combining coaxial electrospinning technique, thermal treatment and electrostatic adsorption. As an anode material for LIBs, the PMo12−SiO2@N−C delivered an excellent specific capacity of 1641 mA h g−1 after 1000 cycles under 2 A g−1. The excellent electrochemical performance benefited from the unique double-shelled hollow structure of the material, in which the outermost N−C shell cannot only hinder the agglomeration of PMo12, but also improve its electronic conductivity. The SiO2 inner shell can efficiently avoid the loss of active components. The hollow structure can buffer the volume expansion and accelerate Li+ diffusion during lithiation/delithiation process. Moreover, PMo12 can greatly reduce charge-resistance and facilitate electron transfer of the entire composites, as evidenced by the EIS kinetics study and lithium-ion diffusion analysis. This work paves the way for the fabrication of novel POM-based LIBs anode materials with excellent lithium storage performance. 相似文献
13.
14.
《Journal of Coordination Chemistry》2012,65(21):3877-3890
In aqueous methanolic solution, reactions of CuCl2, m-hydroxybenzoic acid (HL), and NaOH with 2,2'-bipyridine (bpy) and 1,10-phenanthroline (phen) at room temperature afforded {[Cu(bpy)L](µ2?Cl)(µ2?L)[Cu(bpy)L]}?1.2H2O (1) and {[Cu(phen)Cl](µ2?Cl)(µ2?L)[Cu(phen)L]} (2) with chloro- and carboxylato-bridged dinuclear [Cu(µ2?Cl)(µ2?COO)Cu] cores. The Cu2 dimers in 1 are pairwise aggregated to form H-bonded tetranuclear motifs, which are extended by H2O into 1-D H-bonded chains and further assembled into 2-D supramolecular networks. The Cu2 dimers in 2 are also linked into 1-D H-bonded chains and further assembled into 2-D supramolecular layers. Magnetic measurements indicate that significant antiferromagnetic interactions (J = ?15.9, ?12.2 cm?1) between Cu2+ ions are dominant in these dinuclear [Cu(µ2?Cl)(µ2?COO)Cu] cores. To the best of our knowledge, 2, crystallizing in the acentric polar orthorhombic space group Pna21, represents the first example of metal m-hydroxybenzoato complexes with ferroelectric properties with a remnant polarization (Pr) of ca. 0.04?µC cm?2, coercive field (Ec) of ca. 2.52 kV cm?1, and saturation of the spontaneous polarization (Ps) at ca. 0.195?µC cm?2. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(23):3810-3818
Two supramolecular compounds based on tungstoferrate [FeW12O40]5?, [FeII(2,2′-bipy)3]2[HFeW12O40] · 5H2O (1), and [Hpy]2[4,4′-H2bipy]6(H3O)[FeW12O40]3 · 11H2O (2) (py = pyridine, bipy = bipyridine) were synthesized hydrothermally and characterized structurally. The hydrogen bonds between polyoxoanions and water and the edge-to-face π–π interaction between [FeII(2,2′-bipy)3]2+ with a shortest C–C distance of 3.513 Å are the main forces to construct the 3-D architecture of 1. In 2, a 3-D supramolecular architecture is assembled by the tungstoferrate anions, protonated 4,4′-bipy cations, and water through hydrogen bonding. The variable-temperature magnetic susceptibilities indicate that 1 is paramagnetic with μ eff corresponding to one Fe(III) with spin-only contribution, showing that Fe in the coordination cations has a +II oxidation number and low spin state. 相似文献
16.
17.
WANG Jing-Ping WANG Wei NIU Jing-Yang ② 《结构化学》2007,26(2):194-198
A novel polyoxometalate-based composite compound [Ni(phen)2][Hphen](AsW12O40) (phen = 1,10-phenanthroline) 1 has been hydrothermally synthesized and characterized by elemental analysis, IR, TGA, ESR spectroscopy and single-crystal X-ray diffraction. Each structure unit of 1 consists of one polyoxoanion AsW12O403-, one free phenanthroline molecule and one coordination cation [Ni(phen)2]2+. The title compound crystallizes in the orthorhombic system, space group P212121, with a = 12.2383(7), b = 21.0884(11), c = 22.3237(12) , V = 5761.4(5) 3, Mr = 3520.44, Z = 4, Dc = 4.059 g/cm3, F(000) = 6204, μ(MoKα) = 24.844 mm-1, GOF = 1.022, the final R = 0.0376 and wR = 0.0742 (I > 2σ(I)) for 865 parameters and 9637 observed reflections with I > 2σ(I). 相似文献
18.
Xiuli Wang Baokuan Chen Guocheng Liu Haiyan Zhao Hongyan Lin Hailiang Hu 《Solid State Sciences》2009,11(1):61-67
Two new inorganic–organic hybrid supramolecular compounds based on imidazolium and POMs formulated as (H2bbi)2[Mo8O26] (1) and (H2bbi)2[SiW12O40]·2H2O (2) [bbi = 1,1′-(1,4-butanediyl)bis(imidazole)] have been prepared under hydrothermal conditions and characterized by elemental analyses, IR and single-crystal X-ray diffraction analyses. The two compounds consist of protonated bbis together with POMs. [Mo8O26]4? and [SiW12O40]4? are linked through H2bbi into a three-dimensional (3D) network via hydrogen bonds, respectively. Compound 1 is the first example of 3D two-fold interpenetrating hydrogen bond-supported supramolecular assembly from octamolybdate one-dimensional (1D) chain and imidazolium. The fascinating structural feature of compound 2 is that the anions and the protonated bbi ligands formed a 3D (4, 8) supramolecular network by hydrogen bonds. Compound 2 has been used as a solid bulk-modifier to fabricate three-dimensional bulk-modified carbon paste electrode (CPE) by direct mixing. The electrochemical behavior and electrocatalysis of compound 2 modified CPE (2-CPE) have been studied. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(2):192-201
An organic-inorganic hybrid polyoxometalate [Ni(phen)(H2O)3]2[Ni(H2O)5][H2W12O40]?·?6H2O (phen?=?1,10-phenanthroline) has been isolated and characterized by IR, UV, electrochemistry and single-crystal X-ray diffraction. X-ray crystallographic study indicates that the title compound is monoclinic, space group C2/c, with lattice constants a?=?21.7672(17), b?=?16.1189(12), c?=?20.7949(16)?Å, β?=?107.8440(10)°, V?=?6945.2(9)?Å3, D c?=?3.528?Mg?m?3, F(000)?=?6600, Z?=?4, R 1?=?0.0372, wR 2?=?0.0845. The molecular fragment of the title compound consists of two supporting [Ni(phen)(H2O)3]2+ coordination cations, one supporting [Ni(H2O)5]2+ unit, one metatungstate polyoxoanion [H2W12O40]6? and six H2O molecules of crystallization. 相似文献
20.
Dr. Sara Sabater Dr. David Schmidt Dr. Heidi Schmidt Dr. Maximilian W. Kuntze-Fechner Dr. Thomas Zell Connie J. Isaac Dr. Nasir A. Rajabi Harry Grieve Dr. William J. M. Blackaby Dr. John P. Lowe Prof. Stuart A. Macgregor Dr. Mary F. Mahon Prof. Dr. Udo Radius Prof. Michael K. Whittlesey 《Chemistry (Weinheim an der Bergstrasse, Germany)》2021,27(52):13221-13234
The addition of PPh2H, PPhMeH, PPhH2, P(para-Tol)H2, PMesH2 and PH3 to the two-coordinate Ni0 N-heterocyclic carbene species [Ni(NHC)2] (NHC=IiPr2, IMe4, IEt2Me2) affords a series of mononuclear, terminal phosphido nickel complexes. Structural characterisation of nine of these compounds shows that they have unusual trans [H−Ni−PR2] or novel trans [R2P−Ni−PR2] geometries. The bis-phosphido complexes are more accessible when smaller NHCs (IMe4>IEt2Me2>IiPr2) and phosphines are employed. P−P activation of the diphosphines R2P−PR2 (R2=Ph2, PhMe) provides an alternative route to some of the [Ni(NHC)2(PR2)2] complexes. DFT calculations capture these trends with P−H bond activation proceeding from unconventional phosphine adducts in which the H substituent bridges the Ni−P bond. P−P bond activation from [Ni(NHC)2(Ph2P−PPh2)] adducts proceeds with computed barriers below 10 kcal mol−1. The ability of the [Ni(NHC)2] moiety to afford isolable terminal phosphido products reflects the stability of the Ni−NHC bond that prevents ligand dissociation and onward reaction. 相似文献