首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 14 毫秒
1.
The title zinc alkoxide, bis(μ‐2‐ethoxyphenolato)‐κ3O1,O2:O13O1:O1,O2‐bis[(2‐ethoxyphenolato‐κ2O1,O2)(pyridine‐κN)zinc(II)] toluene hemisolvate, [Zn2(C8H9O2)4(C5H5N)2]·0.5C7H8, crystallizes with two independent complex molecules located on inversion centres and one independent toluene solvent molecule disordered about an inversion centre. The ZnII atoms are six‐coordinated in distorted octahedral geometries with O5N donor sets. The ZnII ions and bridging alkoxide groups are arranged in a diamond Zn2O2 core structure. The guetholate (2‐ethoxyphenolate) ligands adopt two different coordination modes, viz. peripheral chelating and μ2‐bridging. Preliminary investigations of the catalytic activity of the compound in the ring‐opening polymerization of L‐lactide demonstrate rapid and efficient generation of polylactide.  相似文献   

2.
3.
The largest multinuclear zinc framework synthesized is in the title compound (see picture), which contains structural features closely related to the motifs found in layered and three‐dimensional zincophosphates and zincophosphonates. The reactive centers make this zincophosphonate a viable precursor for the synthesis of porous zincophosphonate materials.  相似文献   

4.
[Hg(sulfamethoxazolato)2]·2DMSO ( 1 ) and [Cu2(CH3COO)4(sulfa‐methoxazole)2] ( 2 ) can be obtained by the reaction of sulfamethoxazole with mercury acetate or copper acetate in methanol. The structures of the two complexes were characterized by single crystal X—ray diffractometry. Compound 1 consists of sulfamethoxazolato ligands bridging the metal ions building an unidimensional chain. Two solvent dimethylsulfoxide molecules are involved via N‐H···O hydrogen bridges. The mercury atom shows a linear primary coordination arrangement formed by two trans deprotonated sulfonamidic nitrogen atoms. The overall coordination around the metal atom may be regarded as a strongly distorted octahedron when the interactions of mercury with four sulfonamidic oxygen atoms [bond distances of 2.761(4) Å—2.971(4) Å] are also considered to build an equatorial plane and the N1 and N1′ atoms [bond distance of 2.037(5) Å] occupy the apical positions. Compound 2 is a dinuclear complex in which the copper ions are bridged by four syn‐syn acetate ligands which are related by a symmetry centre located in the centre of the complex. Each copper atom presents a nearly octahedral coordination where the equatorial plane is formed by four oxygen atoms and an isoxazolic nitrogen atom and the second copper atom occupy the apical positions.  相似文献   

5.
6.
In the title compound, [Zn(C7H6NO2)(NO3)(H2O)]n, the Zn atom is coordinated by two nitrate ions, one aqua molecule and two 4‐aminobenzoate ions in a distorted octahedral geometry. The structure of the compound exhibits a two‐dimensional layer, which is formed by the interconnection of [Zn(C7H6NO2)(H2O)]n chains viaμ2‐nitrate bridges or by the interconnection of [Zn(NO3)(H2O)]n chains viaμ2‐4‐aminobenzoate bridges.  相似文献   

7.
A tetranuclear molybdenum cluster compound {Mo43-S)33-O)[S2P(OEt)2]5} · 3CH3CN was obtained by the reaction of MoCl3 · 3H2O with P2S5 in ethanol and then recrystallization from acetonitrile. The compound crystallizes in the trigonal system belonging to the space group R3 with the following cell dimensions: a = b = c = 12.852 (3) Å, α = β = γ = 108.37 (2)°, V =1697.3Å3 Z = 1, Dc. = 1.693g.cm?3. The structure was solved by heavy atom method and refined by full-matrix least-squares to R = 0.072 for 1781 reflections with I≥3σ(I). The results of the structure determination indicate that the cluster skeleton possesses a cubanelike cluster core formed by four Mo atoms located in a distored tetrahedron with three S atoms and one O atom as its triple bridging atoms. There are two sets of bond distances, i.e. 2.700 (1) and 2.831(1) Å in the six Mo—Mo bonds. Taking the Mo cluster core as a whole, it has a formal oxidation state of +14, leaving ten electrons to form the metal-metal bonds. Thus each Mo—Mo bond has an average bond order of 5/6.  相似文献   

8.
9.
The title compound, tetrakis(tetraethylammonium) cyclo‐tetra‐μ‐oxo‐tetrakis[dioxovanadium(V)] dihydrate, (C8H20N)4[V4O12]·2H2O, was obtained by reacting V2O5 with (C2H5)4NOH. It consists of a discrete centrosymmetric molecular anion, [V4O12]4?, where four tetrahedral VO4 units share two vertices with each other to form a ring. A water mol­ecule is attached on each side of the ring through hydrogen bonds.  相似文献   

10.
Disulfido-Bridged Halo Complexes of Molybdenum (V). Crystal Sructures of (PPh3Me)2 [Cl4Mo (μ-S2)2MoCl4]. 2 CH2Cl2 and (PPh4)2[Br4Mo(μ-S2)2MoBr4]. 3CH2Br2 . Mo(S2)Cl3 is prepared by an improved method; the i.r. spectrum is reported. In dichloro methane solution it reacts with (PPh3Me)Cl forming the complex (PPh3Me)2[Cl4Mo(μ-S2)2MoCl4] · 2 CH2Cl2. The bromo complex (PPh4)2[Br4Mo(μ-S2)2MoBr4] · 3 CH2Br2 is obtained by reaction of MoBr4 with S7NH and subsequent treatment of the reaction mixture with PPh4Br in CH2Br2 solution. Both complexes are characterized by i.r. spectra and structural analyses by X-ray methods. (PPh3Me)2[Cl4Mo(μ-S2)2MoCl4] · 2 CH2Cl2 crystallizes monoclinic in the space group P21/c with two formula units per unit cell (5268 observed independent reflexions, R = 4.0%). The lattice dimensions are: a = 1097 pm, b = 1510 pm, c = 1591 pm, β = 104.4°. (PPh4)2[Br4Mo(μ-S2)2MoBr4] · 3 CH2Br2 crystallizes triclinic in the space group P&1macr; with two formula units per unit cell and the lattice constants a = 1328 pm, b = 1573 pm, c = 1719 pm, α = 95.8°, β = 96.3°, γ = 74.1°. Both compounds are of ionical structure with PPh3Me and PPh4 cations, respectively, and anions [X4MO(μ-S2)2MoX4]2? very similar to each other. The molybdenum atoms are bridged by two disulfido ligands and are bonded directly with a bond length of 286 pm. The terminal halogen atoms add up to coordination number nine at the molybdenum.  相似文献   

11.
Syntheses and Crystal Structures of new Amido- und Imidobridged Cobalt Clusters: [Li(THF)2]3[Co32-NHMes)3Cl6] (1), [Li(DME)3]2[Co184-NPh)33-NPh)12Cl3] (2), [Li(DME)3]2[Co64-NPh)(μ2-NPh)6(PPh2Et)2] (3), and [Li(THF)4][Co83-NPh)62-NPh)3(PPh3)2] (4) The reactions of cobalt(II)-chloride with the lithium-amides LiNHMes and Li2NPh leads to an amido-bridged multinuclear complex [Li(THF)2]3[Co32-NHMes)3Cl6] ( 1 ) as well as to the imido-bridged cobalt cluster [Li(DME)3]2[Co184-NPh)33-NPh)12Cl3] ( 2 ). In the presence of tertiary phosphines two imido-bridged cobalt clusters [Li(DME)3]2[Co64-NPh)(μ2-NPh)6(PPh2Et)2] ( 3 ) and [Li(THF)4][Co83-NPh)62-NPh)3(PPh3)2] ( 4 ) result. The structures of 1 – 4 were characterized by X-ray single crystal structure analysis.  相似文献   

12.
Investigations on Metal Catalysts. XXII. Chemisorption of Hydrogen on Pt? Ru and η-Al2O3 Supported Pt? Ru Catalysts Measurements of the H2 chemisorption by volumetric method were carried out on several series of Pt? Ru and η-Al2O3 supported Pt? Ru catalysts. Addition of Ru to Pt and vice versa effects a remarkable influence on the sorption behaviour of the starting samples. For mixtures of carrier-free catalysts and η-Al2O3 as well as Pt? Ru/η-Al2O3 catalysts a hydrogen-spillover effect was found.  相似文献   

13.
The compounds [Hg2(μ—SePh)2(SePh)2(PPh3)2] ( I ) and [Hg3Br3(μ—SePh)3] · 2 DMSO ( II ) are formed by reactions of [Hg(SePh)2] with PPh3 in THF( I ) or with HgBr2 in DMSO ( II ) at room temperature. X—ray crystallography reveals that the cluster I consists of a distorted square built by each two Hg and Se atoms. The Hg atoms have almost tetrahedral co‐ordination environments formed by selenium atoms of two (μ‐SePh) ligands and Se and P atoms of terminal SePh and PPh3 ligands. The compound II is a six‐membered ring with alternating Hg and Se atoms in the chair conformation. Two DMSO molecules occupy positions below and above the [Hg3Se3] ring with the oxygen atoms directed to the centre of the ring.  相似文献   

14.
15.
16.
[Co74‐O)2(O2C–CH3)8(NCO)2(HNPEt3)4] · 2 OEt2, a Seven Nuclearity Complex with Four, Five, and Sixfold Coordinated Cobalt Atoms The title compound was prepared from cobalt(II) acetate with Me3SiNPEt3 at 180 °C and subsequent crystallization from diethylether to give blue, moisture sensitive single crystals, which were characterized by a crystal structure determination. Space group P21/n, Z = 2, lattice dimensions at –80 °C: a = 1544.0(1), b = 1522.1(2), c = 1702.0(1) pm, β = 103.911(10)°, R = 0.0490. [Co74‐O)2(O2C–CH3)8(NCO)2 · (HNPEt3)4] has a centrosymmetric cluster‐like structure in which the octahedrally coordinated central cobalt atom is connected with the remaining six cobalt atoms via two μ4‐oxygen atoms as well as via four bridging acetato groups to form a Co(Co)6 octahedral skeleton. Four of the peripheric cobalt atoms have a distorted trigonal‐bipyramidal coordination sphere, the other two cobalt atoms are tetrahedrally coordinated. The latter are connected with the nitrogen atoms of the cyanato groups.  相似文献   

17.
采用一个预制的簇合物(Et4N)2[MoS4(CuCN)2]·H2O(1)和HAc在MeCN中混合反应,生成了一个有趣的二维聚合簇合物(Et4N)3{[MoS4Cu2(m-CN)]2(m’-CN)}·2MeCN (2)。通过元素分析,红外光谱及单晶X-射线衍射分析对簇合物2进行了表征。在2的结构中,前驱体1中的MoS4Cu2簇核得到了保留,并且此簇核作为三重连接点通过单一氰桥和其他相同的簇核相连,形成一个阴离子型的2D (6,3)(蜂窝状)网络。由预制的簇合物1通过醋酸诱导形成的超分子2表明这种简单的合成方法有可能应用到许多其他相关的体系。  相似文献   

18.
19.
20.
The undecanuclear copper cluster Cu11(μ9‐Se)(μ3‐I)3[Se2P(OEt)2]6 1 , has been isolated along with Cu88‐Se)[Se2P(OEt)2]6 2 , from the reaction of NH4Se2P(OEt)2, Cu(CH3CN)4PF6, and Bu4NI in a molar ratio of 3:2:2 in diethyl ether. The molecular formulation of 1 was confirmed by elemental analysis, positive FAB mass spectrometry, multinuclear NMR (1H, 31P, and 77Se), and X‐ray diffraction. In cluster 1 eleven copper atoms adopt the geometry of a 3,3,4,4,4‐pentacapped trigonal prism with a selenium atom in the center. The coordination geometry for the central, nonacoordinated selenium atom is tricapped trigonal prismatic. In addition, the central core Cu11Se is further stabilized by three iodides and six dsep ligands. Besides, weak inter‐molecular Se···I interactions (3.949–3.972 Å) are uncovered and form a one dimensional polymeric chain.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号