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1.
Bao-Cheng Wang Xiao-Li Chen Huai-Ming Hu Hong-Liang Yao Gang-Lin Xue 《Inorganic chemistry communications》2009,12(9):856-859
Two novel Zn(II) coordination polymers, [Zn5(pytpy)8(fum)4(H2O)4(OH)2]n · n(CH3OH) · 2n(H2O) (1) and [Zn3(pytpy)4 (btc)2]n · 2n(H2O) (2) (pytpy = 4′-(4-pyridyl)-3,2′:6′,3″-terpyridine, H2fum = fumaric acid, H3btc = 1,3,5-benzenetricarboxylic acid) have been hydrothermally synthesized and structurally characterized. Complex 1 is a 2D layer structure, which is constructed from linear pentanuclear Zn(II) subunits interconnected via bidentate-bridging pytpy ligands and tridentate-bridging fum2− anions. Complex 2 is a 3D network structure, μ2-pytpy ligands link the layers based on the heart-like hexanuclear subunits to form the 3D network. Both complexes show strong fluorescence emission upon excitation at 310 nm in solid state. Additionally, these two complexes possess great thermal stabilities, especially for 2, the framework is stable up to 350 °C. 相似文献
2.
Bimetallic salicylaldimine-nickel complexes, 2,4,6-Me3-1,3-{[NCH–(3′-R-5′-Y-2′-O–C6H3)-κ2-N,O]Ni(Ph) (PPh3)}2 [R = tert-Bu, Y = Me, 1b; R = Ph, Y = H, 2b] were prepared and their catalytic behaviors of ethylene polymerization were investigated. The bimetallic complex 2b shows higher activities (2.9 × 105 g PE mol−1 Ni h−1) for ethylene polymerization and affords polymer with high molecular weight (Mw = 1.41 × 105) and broad molecular weight distribution (Mw/Mn = 6.1) than its mononuclear matrix, {[(2,6-Me2C6H3)–NCH–(3′-Ph-2′-O–C6H3)-κ2-N,O]Ni(Ph)(PPh3)} (3) (Activity = 5.5 × 104 g PE mol−1 Ni h−1; Mw = 1.86 × 104; Mw/Mn = 2.8). 相似文献
3.
Su-Zhen Zhang Zhi-Hui Zhang Cheng-Peng Li Miao Du 《Inorganic chemistry communications》2009,12(10):1038-1041
Reaction of potassium N′-(pyridine-4-carbonyl)-hydrazinecarbodithioate ([K+(H2L)−]) with HgII or MnII inorganic salt in the presence of 1,10-phenanthroline (phen) or 4,4′-bipyridine (bipy), yields complexes [Hg(pyt)2(phen)] (1) and {[Mn(pyt)2(H2O)2]·(bipy)·(H2O)2}n (2), in which the pyt ligand (Hpyt = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol) is obtained by in situ ligand formation from the acyclic precursor [K+(H2L)−]. Single crystal X-ray diffraction suggests that the pyt anionic ligands in 1 and 2 behave as thiolate and thione isomers, respectively, and display S- and μ-Npyridyl, Noxadiazole-binding fashions. Complex 1 shows a 1-D fishbone-like supramolecular array via strong aromatic stacking interactions between the discrete mononuclear coordination motifs, whereas 2 has a 2-D layered host coordination framework with the inclusion of bipy and water guests in the cavities. 相似文献
4.
The lead(II) complex with nitronyl nitroxide, [Pb(NIT2Py)2(NO3)2] [NIT2Py = 2-(2′-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide], has been prepared and characterized by magnetic and single-crystal X-ray diffraction studies. In the complex, the lead(II) ion is coordinated with two bidentate nitronyl nitroxide and two nitrate anions. The lead(II) ion shows seven-coordinate geometry. Magnetic susceptibility data for the title complex has been measured in the range 5–300 K. There are antiferromagnetic interaction between the coordinated nitronyl nitroxides (J = −19.35 cm−1) and intermolecular ferromagnetic interactions. Thus, we observe the sixth periodic IVA group metal element Pb(II) ion providing an effective pathway for the magnetic exchange interaction between nitronyl nitroxide radicals. 相似文献
5.
Ilenia Rossetti Olga Buchneva Cesare Biffi Riccardo Rizza 《Applied catalysis. B, Environmental》2009,89(3-4):383-390
ABO3 perovskite-like catalysts are known to be sensitive to sulphur-containing compounds. Possible solutions to increase resistance to sulphur are represented by either catalyst bed protection with basic guards or catalyst doping with different transition or noble metals. In the present work La(1−x)A′xCoO3, La(1−x)A′xMnO3 and La(1−x)A′xFeO3, with A′ = Ce, Sr and x = 0, 0.1, 0.2, either pure or doped with noble metals (0.5 wt% Pt or Pd), were prepared in nano-powder form by flame-pyrolysis. All the catalysts were tested for the catalytic flameless combustion of methane, monitoring the activity by on-line mass spectrometry. The catalysts were then progressively deactivated in operando with a new procedure, consisting of repeated injection of some doses of tetrahydrothiophene (THT), usually employed as odorant in the natural gas grid, with continuous analysis of the transient response of the catalyst. The activity tests were then repeated on the poisoned catalyst. Different regenerative treatments were also tried, either in oxidising or reducing atmosphere.Among the unsubstituted samples, higher activity and better resistance to poisoning have been observed in general with manganites with respect to the corresponding formulations containing Co or Fe at the B-site. The worst catalyst showed LaFeO3, from both the points of view of activity and of resistance to sulphur poisoning. La0.9Sr0.1MnO3 showed, the best results, exhibiting very high activity and good resistance even after the addition of up to 8.4 mg of THT/g of catalyst. Interesting results were attained also by adding Sr to Co-based perovskites. Sr showed a first action by forcing Mn or Co in their highest oxidation state, but, in addition, it could also act as a sulphur guard, likely forming stable sulphates due to its basicity. Among noble metals, Pt doping proved beneficial in improving the activity of both the fresh and the poisoned catalyst. 相似文献
6.
Yunshan Zhou Lijuan Zhang Xiaozeng You Srinivasan Natarajan 《Inorganic chemistry communications》2001,4(12):3417
A new one-dimensional Fe(II)molybdophosphate of the formula, [(C10H8N2)H2]2[Fe4(II)Mo12(V)(HPO4)6(PO4)2(H2O)8(OH)6O24]·8H2O, (1), has been synthesized by employing hydrothermal methods and characterized by single crystal X-ray diffraction. The structure consists of a network of MO6 (M = Fe, Mo) octahedra and (H)PO4 tetrahedra linked through their vertices. The connectivity between the polyhedral units gives rise to one-dimensional chains with eight-membered apertures. The hydrogen bonded interactions between the chains form pseudo two-dimensional layers. Extensive hydrogen bonding also exists between the amine molecule, 4,4′-bipyridine, water molecule and framework oxygen atoms. Crystal data for 1: monoclinic, space group = P21 (no. 4), a=12.549(3) (Å), b=23.496(5) (Å), c=14.551(3) (Å), β=114.87(3)°,
, and Z=2. 相似文献
7.
Olesia V. Vreshch Oksana V. Nesterova Vladimir N. Kokozay Brian W. Skelton Carlos J. Gmez García Julia Jezierska 《Inorganic chemistry communications》2009,12(9):890-894
The one-pot reaction of copper powder, sodium nitroprusside, ammonium thiocyanate and 2,2′-bipyridine (bpy) in acetonitrile solution at ambient conditions of air and water yields the novel heterometallic [Fe2Cu2(bpy)6(μ-CN)4(NCS)2]2[Fe(CN)5(NO)](NCS)2·5H2O complex 1, which has been structurally and magnetically characterized. The most prominent feature of this complex is the unique tetranuclear squares comprised [Cu(bpy)NCS]+ and [Fe(bpy)2]2+ corners with CN edges. The CuCu and FeFe separations are 6.72 and 7.73 Å, respectively. The variable-temperature magnetic susceptibility study revealed that a very weak antiferromagnetic coupling is active between Cu(II) centers (JCuCu = −0.37 cm−1). 相似文献
8.
The open framework compound of [Gd2(BDA)3(DMF)2(H2O)4] · 2DMF (1), prepared by heating GdCl3 with 2,2′-bipyridyl-4,4′-dicarboxylatic acid (BDA) in mixed solvent, is constructed from BDA linking up polymeric [GdO5(DMF)(H2O)2]n tethers. The 1D channels are filled with coordinated and uncoordinated DMF molecules hydrogen bonding to terminal aqua ligands. The study of the temperature dependent magnetic susceptibilities revealed that there are ferromagnetic interactions between intra-chain GdIII atoms and weak antiferromagnetic interactions between inter-chain GdIII atoms. 相似文献
9.
MnIII(J-salen)Cl (Jacobsen catalyst) with J-salen=N,N′-bis(3,5-di-tert.-butylsalicylidene)-1,2-diaminocyclohexane dianion in CHCl3 is photooxidized by the solvent to a MnIV(J-salen) complex, presumably MnIV(J-salen)Cl2, with φ=0.002 at λirr=333 nm. 相似文献
10.
N. Gabriel Armatas Wayne Ouellette Joshua Pelcher Jon Zubieta 《Inorganic chemistry communications》2009,12(8):747-749
The hydrothermal reaction of MoO3, CuSO4·5H2O, tetra-4-pyridylpyrazine (tpyprz), and diphenyldiarsonic acid in water at 140 °C for 48 h yielded the one-dimensional material [{Cu2(tpyprz)(H2O)3}2{Mo8O26}{Mo12O36(AsO4)}]·8H2O (1·8H2O). The chain structure of 1·8H2O is constructed from alternating β-octamolybdate clusters and molybdoarsonate Keggin clusters linked through {Cu2(tpyprz)(H2O)3}4+ binuclear subunits. The Cu(II) sites are inequivalent with one copper bonding to two pyridyl donors and a pyrazine nitrogen of one terminus of the tpyprz ligand, two aqua ligands and an oxo-group of the cluster while the second copper site coordinates to the nitrogen donors of the other terminus of the tpyprz ligand, an aqua group, a terminal oxo-group of the cluster and a terminal oxo-group of the mixed valence {Mo11VIMoVO36(AsO4)}4− cluster. Crystal data: C48H60AsCu4Mo20N12O80: FW = 4332.96 Triclinic , a = 12.5087(5) Å, b = 13.6681(6) Å, c = 14.8980(6) Å, α = 92.196(1)°, β = 97.046(1)°, γ = 97.751(1)°, Z = 1, Dcalc = 2.877 g cm−3; structure solution and refinement based on 12,333 reflections (Mo Kα, λ = 0.71073 Å) converged at R1 = 0.0540 and wR2 = 0.1115. 相似文献
11.
Marta Fernndez-García Pedro Francisco Caamero Jos Luis de la Fuente 《Reactive and Functional Polymers》2008,68(9):1384-1391
Epoxy-functional spontaneous gradient copolymers of glycidyl methacrylate (G) and n-butyl acrylate (B) were synthesized via atom transfer radical polymerization (ATRP). The copolymerization reactions were carried out in toluene solution at 70 °C, using methyl 2-bromopropionate (MBrP) as initiator and copper chloride with N,N,N′,N′′,N′′-pentamethyldiethylenetriamine (PMDETA) as the catalyst system. The kinetic behaviour of the statistical copolymerizations was studied in a wide composition interval with molar fractions of G ranging from 0.10 to 0.75. The synthesized copolymers were characterized by size exclusion chromatography (SEC) and nuclear magnetic resonance (NMR) spectroscopy. 1H NMR was employed to determine the copolymer composition, demonstrating the gradient character of the copolymers along the main chain in the whole monomer conversion interval. Apart from this, the sequence distribution and stereoregularity were analyzed. These microstructural experimental data agreed well with those calculated from Mayo-Lewis terminal model (MLTM) and a Bernoullian statistic with an isotacticity parameter of σG = 0.28 and a coisotacticity parameter of σ = 0.30. 相似文献
12.
Li Zhang Lei Wang Xiao-Yan Ma Rui-Xiang Li Xian-Jun Li 《Catalysis communications》2007,8(12):2238-2242
The influences of pH on the catalytic properties of Ru-η6-C6H6-diphosphine complex [RuCl(η6-C6H6)(BISBI)]Cl (1) (BISBI = 2,2′-bis(diphenylphosphinomethyl)-1,1′-biphenyl), [RuCl(η6-C6H6)(BDPX)]Cl (2) (BDPX = 1,2-bis(diphenylphosphinomethyl)benzene), Ru2Cl4(η6-C6H6)2(μ2-BDNA) (3) (BDNA = 1,8-bis(diphenylphosphinomethyl)naphthalene), [RuCl(η6-C6H6)(BISBI)]BF4 (4), [RuCl(η6-C6H6)(BDPX)]BF4 (5), and [(η6-C6H6)2Ru2Cl2(μ2-Cl)(μ2-BDNA)]BF4 (6) for the hydrogenation of benzene were investigated in aqueous-organic biphasic system. The hydrogenation of benzene catalyzed by all complexes yielded only cyclohexane. The catalytic results revealed that the stabilities of these complexes were not only closely relative with their compositions or molecular structures but also the pH value of aqueous solution. Complexes 1 and 2 were homogeneous catalysts at pH <5, but complexes 3, 4, 5 and 6 were partly decomposed in the same reaction conditions and played simultaneously the roles of homogeneous and heterogeneous catalysts. When the pH was up to 12, all of six complexes were gradually decomposed to Ru(0) particles. The addition of extra phosphine ligand was favorable to prevent these complexes from decomposing in the catalytic process. The experiment of mercury poisoning and the curve of conversion vs time strongly supported above conclusions. 相似文献
13.
The novel six-coordinated gadolinium(III) complex of formula [Gd2(dca)4(OH)2(NITpPy)4] (1) (dca = dicyanamide, NITpPy = 4-pyridyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-oxy-3-oxide) has been prepared and characterized by X-ray crystallography. Compound 1 is a dimer structure made up of double μ1,5-dca-bridged gadolinium(III) ions and one terminal dca ligand; variable-temperature magnetic susceptibility measurements reveal the occurrence of a significant ferromagnetic interaction directly spin polarization through the NITpPy–Gd(III)–NITpPy pathway with J = 11.56 cm−1. 相似文献
14.
Enjun Gao Yun Huang Mingchang Zhu Lei Wang Fuchun Liu Hongyan Liu Shuang Ma Qunzhi Shi Ni Wang Chunyue Shi 《Inorganic chemistry communications》2009,12(9):872-874
A novel 1D infinite water chain made of (H2O)12 clusters containing two different chair water hexamers is found in the binuclear coordination compound, [K2(L)2(phen)4]·6H2O (1) (where L = 2,2′-azanediyldibenzoic dianion, phen = 1,10′-phenanthroline), which has been synthesized and structurally characterized by single-crystal X-ray diffraction. The fluorescence spectrum and thermogravimetric analysis (TGA) of the title complex 1 have been also discussed. 相似文献
15.
Yong Li Zhao-Xia Zhang Pegn-Zhi Hong Zhan-Xia Wua Ke-Chang Li 《Inorganic chemistry communications》2008,11(7):761-764
One new metal-organic polymer formulated as [Fe2(μ10-btc)0.5(μ2-ox)0.5(μ2-O)1.5]n 1 (btc = 1,2,4,5-benzenetetracarboxylate, pyramellitate; ox = oxalate) has been synthesized by low-temperature solid-state reaction and characterized by single-crystal X-ray diffraction, elemental analyses, TGA, IR spectra and UV–visible spectra. Complex 1 presents the first 3D coordination network structure constructed by bridging btc, ox and O mixed ligands. In 1, carboxyl groups of btc are all deprotonated and they have a new type of μ10-btc coordination mode. The third-order non-linear optical (NLO) properties of the title compound 1 were also investigated and they exhibit the reverse saturable absorption and self-defocusing performance with modulus of the hyperpolarizability (γ) 5.98 × 10−30 esu for 1 in a 7.45 × 10−4 mol dm−3 DMF solution. 相似文献
16.
Edwin C. Constable Catherine E. Housecroft Elaine A. Medlycott Markus Neuburger Federica Reinders Sbastien Reymann Silvia Schaffner 《Inorganic chemistry communications》2008,11(7):805-808
The solid state structure of [Ru(Phtpy)2][PF6]2 · 4MeCN has been determined (Phtpy = 4′-phenyl-2,2′:6′,2″-terpyridine); [Ru(Phtpy)2]2+ cations pack into sheets by virtue of {M(tpy)2}2 embraces, and the MeCN solvent molecules are involved in NH–C interactions which prevent the efficient packing of adjacent sheets. Comparisons with related structures lead to some generalizations about packing motifs in salts containing [M(Phtpy)2]2+ or [M(pytpy)2]2+ cations (pytpy = 4′-pyridyl-2,2′:6′,2″-terpyridine). 相似文献
17.
Jian-Wei Ji Wei Zhang Guo-Xin Zhang Zheng-Bo Han 《Inorganic chemistry communications》2009,12(10):956-958
A new metal-organic network (EMIM)[Co2(hip)2(μ3-OH)]·H2O (1), (H2hip = 5-hydroxyisophthalic acid and EMIM = 1-ethly-3-methylimidazolium), has been synthesized by the ionothermal reaction of cobalt nitrate, H2hip and [EMIM]Br ionic liquid. Single-crystal X-ray diffraction analysis reveals that 1 exhibits a two-dimensional (2D) bilayer constructed from tetranuclear [Co4(μ3-OH)2] building units and hip2− linkers. There are square cavities with the dimension of 10.161 × 10.868 Å. The [EMIM]+ cations are located in the cavities, which have the hydrogen bonding interactions with the bilayer. Further more, the strong hydrogen bonds between the carboxylate and hydroxyl oxygen atoms of hip2− ligands and lattice water molecules extend the 2D layer into a 3D supramolecular network. The magnetic properties of 1 have been investigated by variable-temperature magnetic susceptibility and magnetization measurements, and the results reveal that there exist antiferromagnetic interactions. 相似文献
18.
Yinghua Chen Yanming Zhao Xiaoning An Jianmin Liu Youzhong Dong Ling Chen 《Electrochimica acta》2009,54(24):5844-5850
Cr-doped Li3V2−xCrx(PO4)3/C (x = 0, 0.05, 0.1, 0.2, 0.5, 1) compounds have been prepared using sol–gel method. The Rietveld refinement results indicate that single-phase Li3V2−xCrx(PO4)3/C with monoclinic structure can be obtained. Although the initial specific capacity decreased with Cr content at a lower current rate, both cycle performance and rate capability have excited improvement with moderate Cr-doping content in Li3V2−xCrx(PO4)3/C. Li3V1.9Cr0.1(PO4)3/C compound presents an initial capacity of 171.4 mAh g−1 and 78.6% capacity retention after 100 cycles at 0.2C rate. At 4C rate, the Li3V1.9Cr0.1(PO4)3/C can give an initial capacity of 130.2 mAh g−1 and 10.8% capacity loss after 100 cycles where the Li3V2(PO4)3/C presents the initial capacity of 127.4 mAh g−1 and capacity loss of 14.9%. Enhanced rate and cyclic capability may be attributed to the optimizing particle size, carbon coating quality, and structural stability during the proper amount of Cr-doping (x = 0.1) in V sites. 相似文献
19.
To improve the hydrolysis resistant ability of trisiloxane surfactants, ethoxylated single-tail and double-tail trisiloxane
surfactants of the general formulas Me3SiOSiMeR1OSiMe3 (R
1 = (CH2)3NHCH2CH(OH)CH2(OCH2CH2)
x
OCH3; x = 8.4, 12.9, 17.5, 22) and Me3SiOSiMeR2OSiMe3 (R
2 = (CH2)3NR3CH2CH(OH)CH2(OCH2CH2)
x
OCH3; R
3 = CH2(CH2)
y
CH3; x = 8.4, 12.9, 17.5, 22; y = 2, 6) were synthesized. Their structures were characterized by 1H NMR and 13C NMR. The surface activity and hydrolysis resistant properties of the trisiloxane surfactants prepared were also studied.
The values of the critical micelle concentration of all trisiloxane surfactants prepared were at levels of 10−5 and 10−4 mol/L. They can reduce the surface tension of water to less than 24 mN/m. The hydrolysis resistant properties of double-tail
trisiloxane surfactants are superior to those of single-tail trisiloxane surfactants. The double-tail trisiloxane surfactants
1B (x = 8.4; y = 2) and 2C (x = 12.9; y = 6) can be stable for 8 days in an acidic solution (pH 4.0) and 11 days in an alkaline environment (pH 10.0). 相似文献
20.
Oswaldo Treu-Filho Jos C. Pinheiro Rodrigo A. de Souza Rogrio T. Kondo Raimundo D. de Paula Ferreira Antnio F. de Figueiredo Antonio E. Mauro 《Inorganic chemistry communications》2007,10(12):1501-1504
Theoretical molecular structures of the complexes cis-[PdCl2(tmen)] and cis-[Pd(N3)2(tmen)] (tmen = N,N,N′,N′-tetramethylethylenediamine) were investigated using B3LYP/DFT method. The calculated molecular parameters, bond distances and angles, revealed a square-planar geometry around the metallic center for both compounds with the azide being linear. The theoretical infrared spectra of C1 symmetry (electronic state 1A) of the compounds are in agreement with the experimental data. 相似文献