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 15 毫秒
1.
[Pt(COD)Cl2] (COD=1,5-cyclooctadiene) is a versatile starting material for the synthesis of Pt(II) compounds. The preparations of the new compounds [Pt(COD)Cl(NO3)], [Pt(COD)(NO3)2] and [Pt(PPh3)3(NO3)](NO3) and also of the known compounds cis[Pt(PPh3)2Cl2], cis [Pt(PPh3)2Cl(NO3)], cis[Pt(PPh3)2(NO3)2] and [Pt(PPh3)3Cl](NO3)are reported. The compounds are characterized by elemental analysis, 31P{1H} NMR spectroscopy and IR spectroscopy.  相似文献   

2.
《Inorganica chimica acta》1986,122(1):111-118
The title complex, prepared in 1 M NaOH, was crystallized from hot N,N-dimethylformamide/ ethanol solutions to give Na12[Ce(C6H2O2(SO3)2)4]· 9H2O·6DMF. The purple—brown crystals were examined by X-ray diffraction while inside quartz capillaries filled with DMF, (λmax 425 nm, ϵ 3664; λsh 520 nm, ϵ 2240) and belong to space group Pbca, Z=8 with a=21.846(4), b=17.348(2), c=43.103- (6) Å, V=16.335(7) Å3, Dc=1.693 gcmt−3, Do=1.725 g cmt−3. Diffractometer data were collected using Mo Kα radiation to 2θ=43o. For 7331 independent data with Fo2>3σ(Fo2) full matrix least squares refinement converged to unweighted and weighted R factors of 0.072 and 0.110, respectively, with a mixture of anisotropic and isotropic thermal parameters. The disordered DMF atom parameters were not refined. The structure consists of discrete monomeric Ce(C6H2S2O8)412− units with 12 Na+ counter cations and 10 H2O molecules (two with half occupancy), and 6 DMF molecules of solvation filling up spaces between cations and anions. Cerium(IV) is in a general position with a coordination polyhedron close to the trigonal-faced dodecahedron, D2d, with the angles between the two BAAB trapezoids of 2.3o and 3.7o. The average CeO(A) distance, 2.363(9) Å is longer than the average CeO(B) distance, 2.326(15)Å, with the reverse being true for one of the four tironato ligands. The average ring OCeO angle is 67.9(1)o. The cerium (IV) complex is found by cyclic voltammetry to undergo a quasi-reversible one-electron reduction (in strongly basic solution with excess tiron) with Ef=−497 mV vs. SCE, hence the ratio of the formation constants for tetrakis(tironato)cerate(IV) to that for tetrakis(tironato)cerate(III), KIV/KIII, is 1033. Characterization of other tiron salts is reported.  相似文献   

3.
4.
The preparation and properties of binuclear complexes containing the pyrazolate and azide groups as bridging ligands are reported. Representative formulae are: M2(μ-pz)(μ-N3)(CO)4, M2(μ-pz)(μ-N3)- (COD)2 (M = Rh or Ir), (CO)2Rh(μ-pz)(μ-N3)ML2 (M = Rh, L2 = COD, M = Ir, L = CO) and (η3-C3H5)- Pd(μ-pz)(μ-N3)Rh(CO)2. The crystal and molecular structure of the latter complex has been determined by single-crystal X-ray methods. Crystals are monoclinic, space group C2/c with cell constants a = 18.4750(10), b = 10.0351(3), c = 13.6399(6) Å, α = 90, β = 100.022(4), γ = 90°, and Z = 8. The final R and Rw values were 0.051 and 0.062 for 1417 observed reflexions. This binuclear compound packs in the crystal zig-zag chains of rhodium atoms, along the c axis, wtth intermolecular Rh···Rh contacts of 3.290(1) and 3.604(1) Å. The Rh···Rh···Rh angle is 163.16(4)°.  相似文献   

5.
《Inorganica chimica acta》1986,122(2):199-205
The X-ray structures of two binuclear copper(II) chloride complexes of the tetradentate ligands 1,4- bis(4,6-dimethyl-2-pyridylamino)phthalazine (PAP46Me) and 3,6-bis(2-pyridylthio)pyridazine are reported. [Cu2(PAP46Me)Cl4] (1) and [Cu2(PTP)Cl4]· CH3CH2OH (2) contain triply bridged binuclear centres involving a diazine (NN) and two chlorobridges with copper-copper separations in the fange 3.19–3.25 Å and distorted square pyramidal copper stereochemistry. The reduced room temperature magnetic moments indicate antiferromagnetically coupled binuclear copper(II) centres.Complex 1 forms green crystals with a= 15.795(3), b=10.661(3), c=16.155(4) Å, β= 113.82(3)°, C2/c, Z = 4, Rf=0.031. Complex (2) forms green crystals with a=33.9022(8), b= 9.1626(5), c= 15.7885(5) Å,β= 114.853(2)°, C2/c, Z=8, Rf=0.047. The structure of the ligand PTP is also reported and compared with that of 2.  相似文献   

6.
7.
The reactions of [ReCl22-NNC(O)Ph}(PPh3)2] (1) with t-BuOOH, in C6H6 or chlorinated solvents, at room temperature or with MeOH upon reflux in air lead to the trichloro-η1-benzoyldiazenido [ReCl31-NNC(O)Ph}(PPh3)2] (2) or the methoxy-oxo [ReOCl2(OMe)(PPh3)2] (3) compound, respectively, which have been characterized by spectroscopic and FAB+-MS methods, elemental and single crystal X-ray diffraction analyses. They show distorted octahedral coordinaiton geometries with trans triphenylphosphine ligands, an essentially linear η1-diazenido moiety in 2 and the methoxy group in 3 in trans position to the oxo ligand.  相似文献   

8.
2-Acetamido-1-N-[N-(tert-butoxycarbonyl)-l-aspart-1-oyl-(l-phenylalanyl-l-serine methyl ester)-4-oyl]-2-deoxy-β-d-glucopyranosylamine and analogs containing d-glucopyranosyl, 4-O-β-d-glucopyranosyl-d-glucopyranosyl, l-Phe-l-Ala, and d-Phe-l-Ser were synthesized by condensation of glycosylamines having free hydroxyl groups with tripeptide esters activated with N-hydroxysuccinimide.  相似文献   

9.
10.
The reaction between [Fe2Ir2(CO)12]2− and diphenylacetylene in refluxing CH3CN yields the substituted cluster [Fe2Ir2(CO)10(PhC2Ph)]2− (1). In the crystals, the four metal atoms define a butterfly arrangement whose Ir-Ir hinge is parallel to the acetylenic C2 unit. The neutral triangular cluster [FeIr2(CO)9(PhC2Ph)] (2) is obtained by the treatment of 1 with acids at room temperature; in this 48 valence electrons species, the C-C and the Ir-Ir bonds are also parallel, in the coordination mode.The cluster [Fe2Rh(CO)10] reacts with diphenylacetylene in refluxing THF yielding [Fe2Rh(CO)8(PhC2Ph)] (3). In this 46 C.V.E.’s cluster, the C2 unit is perpendicular to the Fe-Fe edge, exemplifying the bonding mode. According to 13C NMR spectra, the structure of the three clusters is maintained in solution. Electrochemical investigations show that the one-electron oxidation of [Fe2Ir2(CO)10(L)]2− (L = 2CO, PhC2Ph) as well as the one-electron reduction of [Fe2Rh(CO)8(PhC2Ph)] only generates the respective short lived products.  相似文献   

11.
In order to identify new and potent candidate drugs to treat tuberculosis, a library of compounds was screened, and (S,S)-N,N′-bis-[3-(2,2′,6,6′-tetramethylbenzhydryloxy)-2-hydroxy-propyl]-ethylenediamine (S2824) was identified as a hit in the screen. This research discusses our efforts to synthesize and test 30 analogs of this hit for activity against Mycobacterium tuberculosis. Two compounds with homopiperazine ring possess high in vitro activity against drug sensitive and resistant M. tuberculosis with MICs 0.78–3.13 μg/mL (or 1.22–4.88 μM).  相似文献   

12.
《Inorganica chimica acta》1989,157(2):195-199
The title salt was obtained by a reaction of [TTF]3 [BF4]2 (TTF = tetrathiafulvalene) with [NMe4]2 [V(mnt)3] [mnt = 1,2-dicyanoethylene-1,2- dithiolate(2−)] in a mixture of 1,2-dichloroethane and acetonitrile (3:2 ν/ν). A single crystal X-ray analysis of it revealed a TTF columnar structure consisting of both TTF0 and the TTF·+ radical cation and the distorted octahedral geometry of the [V(mnt)3]2− anion. The salt crystallizes in a monoclinic system, space group C2/c with unit cell constants a = 25.428(3), b = 12.434(2), c = 25.477(3) Å, β = 92.428(3)° and Z = 8. The structure was solved by the direct method and refined, on the basis of 3854 [|Fo| > 3σ(F)] observed data, to an R value of 0.078. The salt e`xhibits electrical conductivity of 1.7 x 10−4 S cm−1 at 25°C for a compacted pellet.  相似文献   

13.
《Inorganica chimica acta》1988,147(2):243-250
The acetone complex [Rh(H)2(acetone)2(PPh3)2]- PF6 reacts with bidiazines and 3,6-bis(2′-pyridyl)- pyridazine (dppn) giving the air stable cis-dihydrido rhodium(III) [Rh(H)2(L)(PPh3)2]PF6 complexes. The structure of the dichloromethane solvate of [Rh(H)2(dppn)(PPh3)2]PF6 has been determined by X-ray crystal structure analysis. Crystals are monoclinic, space group P21/a, with a = 18.629(6), b = 15.339(5), c = 17.146(5) Å, β = 101.02(3)° and Z = 4. The structure has been solved from diffractometer data by Patterson and Fourier methods and refined by block-matrix least-squares to R = 0.076 for 6225 observed reflections. In the structure discrete [Rh(H)2(dppn)(PPh3)2]+ cationic complexes, PF6 anions and dichloromethane solvent molecules are present. The Rh atom is octahedrally surrounded by two cis hydride ligands and by two cis nitrogen atoms from a dppn molecule acting as a bidentate chelating ligand through two neighbouring pyridyl and pyridazinyl nitrogen atoms. Two P atoms from PPh3, ligands in trans apical positions complete to octahedral the coordination of Rh.  相似文献   

14.
15.
The structures of three Pt(II) thiourea complexes, trans-[(tu)2Pt(NH3)2]Cl2 (1), trans-[(tu)2Pt(CH3NH2)2]Cl2·3H2O (2) and [Pt(tu)4]Cl2 (3), have been determined by X-ray diffraction and refined to R = 0.049 for 1026 reflections (1), R = 0.057 for 2547 reflections (2) and R = 0.046 for 2792 reflections (3). All the compounds crystallize in the space group P21/c and have cell dimensions: a = 5.437(1), b = 6.450(1), c = 17.980(3) Å, β = 96.05(2)°, Z = 2 (compound 1); a = 9.225(1), b = 15.404(2), c = 12.601(2) Å, β = 105.39(2)°, Z = 4 (compound 2); and a = 9.051(6), b = 10.203(6), c = 18.263(8) Å, β = 91.12(8)°, Z = 4 (compound 3). The unit cell of 1 and 3 contains only a single type of cation, while that of 2 is formed from two independent cations. In 1 and 2 the coordination spheres of the Pt atoms are rather similar, with angles close to 90° and coplanarity of the metal and respective donor atoms. Instead, in 3 the four sulfur atoms, which surround the Pt, display a slight distortion (0.06 Å from the mean plane) towards tetrahedral.  相似文献   

16.
Diet has been shown to modulate M(1)dG adduct, a biomarker of oxidative stress and lipid peroxidation. Thus, we analysed the association between diet and M(1)dG in 120 controls and 67 Map Ta Phut industrial estate workers in Rayong, Thailand, to evaluate the influence of fruit and vegetables, and fried and charcoal-grilled/barbecued food consumption on M(1)dG. M(1)dG was decreased in controls reporting to consume 14-17 servings/week of fruit and vegetables (mean ratio [MR]= 0.35, CI 0.18-0.69, p< 0.05). Conversely, a non-statistically significant M(1)dG increment was detected in controls consuming 9-18 servings/week of fried food (MR = 1.33, CI 0.88-2.00, p = 0.168). No effect of charcoal-grilled/barbecued food was found. No effect of diet was observed in workers. An association with smoking was observed in controls (MR = 1.88, CI 1.14-3.10, p < 0.05), but not in workers. M(1)dG can induce mutations and/or methylation changes within the promoter regions of cancer-related genes, thus promotion of healthy eating practices should be recommended.  相似文献   

17.
Pentamethylcyclopentadienyl rhodium bipyridine ([Cp*Rh(bpy)(H2O)]2+) is a versatile catalyst to promote biocatalytic redox reactions. However, its major drawback lies in the mutual inactivation of [Cp*Rh(bpy)(H2O)]2+ and the biocatalyst. This interaction was investigated using the alcohol dehydrogenase from Thermus sp. ATN1 (TADH) as model enzyme. TADH binds 4 equiv. of [Cp*Rh(bpy)(H2O)]2+ without detectable decrease in catalytic activity and stability. Higher molar ratios lead to time-, temperature-, and concentration-dependent inactivation of the enzyme suggesting [Cp*Rh(bpy)(H2O)]2+ to function as an ‘unfolding catalyst’. This detrimental activity can be circumvented using strongly coordinating buffers (e.g. (NH4)2SO4) while preserving its activity as NAD(P)H regeneration catalyst under electrochemical reaction conditions.  相似文献   

18.
The cluster compound [Mo2Fe23-S)4- (S2CNEt2)5]CH3CN has been prepared from the reaction system containing (NH4)2MoS4, FeCl3, NaS2CNEt2, PhSH and NaOCH3. The crystal and molecular structure have been determined by the low temperature X-ray diffraction technique. The compound crystallizes in space group P21/c of the monoclinic system with a = 19.397(7), b = 10.891(7), c = 24.302(8) Å, β = 108.95(2)° and Z = 4. With use of 2647 reflections (I)>2.5σ(I)) the structure was refined to R(Rw) = 0.045(0.036). The cluster Mo2Fe2S4(S2CNEt2)5 has a cubane-like skeleton [Mo2Fe2S4]5+. Each metal atom is coordinated by three μ3-S atoms and a disulfide chelate terminal ligand. The fifth S2CNEt2 group as a bridging ligand coordinates to two Mo atoms. In a molecule of the compound, the two Mo atoms are equivalent but the two Fe atoms are unequivalent.  相似文献   

19.
20.
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