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151.
Shamsuddin M. Azad Shariff E. Kabir Madhu S. Saha 《Journal of organometallic chemistry》2005,690(18):4206-4211
Treatment of the electronically unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with primary phosphines PPhH2 and PCyH2 gives the phosphido bridged compounds [(μ-H)Os3(CO)8(μ-PPhH)(μ-dppm)] (2) and [(μ-H)Os3(CO)8(μ-PCyH)(μ-dppm)] (3), respectively, by P-H bond activation of the phosphines and demetallation of the phenyl ring of the diphosphine ligand. Thermolysis of 2 and 3 in refluxing octane at 128 °C results in the formation of the phosphinidene compounds [(μ-H)2Os3(CO)7(μ3-PPh)(μ-dppm)] (4) and [(μ-H)2Os3(CO)7(μ3-PCy)(μ-dppm)] (5), respectively, by further P-H bond cleavage of the phosphido groups. All the compounds have been characterized by infrared, 1H NMR, 31P{1H} NMR and mass spectroscopic data together with single-crystal X-ray diffraction studies for 4. Compound 4 consists of a triangular cluster of osmium atoms with a symmetrically capped phosphinidene ligand and a bridging dppm ligand. 相似文献
152.
A simple one-pot method has been used to prepare uniform single-crystalline CoP nanowires with a high aspect ratio by the thermal-decomposition reaction of cobalt(II) acetylacetone with long-chain alkylphosphonic acid in the presence of hexadecylamine (HDA) and trioctylphosphine oxide (TOPO) at high temperature. The crystal morphology of the resulting nanowires can be influenced by the ratio of HDA and TOPO. 相似文献
153.
Saleha Azad 《Tetrahedron letters》2006,47(4):587-590
A new practical method for the synthesis of unsymmetrical ureas was achieved by condensation between 2,2,2-trichloroethyl carbamates (Troc-carbamates) and primary or secondary amines under high-pressure conditions. 相似文献
154.
Membrane incorporating [Mg{(TAP)(SBn)8}] complex, (I), as ionophore with composition I:NaTPB:DOP:PVC in the ratio 10:2:133:200 (w/w) exhibits the best result for potentiometric sensing of Mg2+ ions. This gives linear potential response in the concentration range of 9.4×10−6 to 1.0×10−1 M with a slope of 29.2±0.4 mV per decade of activity of Mg2+. Standard deviation in observed values of potentials in this concentration range, from the least square fit line, found to be 2.91 mV with 90% confidence limit lying within ±0.4 mV per decade of activity. The electrode works satisfactorily in the pH range 3.5-7.8 and shows a fast response time of 13±2 s. It shows good selectivity for Mg2+ over other mono-, bi- and tri-valent cations. Only K+ and Zn2+ cause slight interference if present at concentrations ≥1.0×10−5 M. The electrode is durable and can be used over a period of 5 months with good reproducibility (∼1% error). It has been successfully used as an indicator electrode in potentiometric titration of Mg2+ against EDTA as well as for the determination of Mg2+ in simulated mixtures. 相似文献
155.
Membrane-based receptor affinity chromatography (MRAC), which utilizes the molecular recognition between an immobilized receptor and its soluble protein ligand, has been developed for the purification of human interleukin-2 and related biomolecules. The multi-purpose affinity membrane used in this study consisted of a soluble form of interleukin-2 receptor (IL-2R) chemically bonded to hollow-fiber membranes in an oriented fashion. A model system involving anti-Tac-H (a humanized monoclonal antibody to IL-2R) was used to study the important factors influencing the performance of MRAC, including support morphology, mass transfer rate and adsorption kinetics. All three are shown to be highly efficient. MRAC has been successfully applied to the purification of anti-Tac-H, recombinant human interleukin-2 (rIL-2) and interleukin 2-Pseudomonas exotoxin fusion protein (IL2-PE40). Overall, MRAC was found to be a viable, scalable and extremely productive affinity purification method. 相似文献
156.
Summary Binding constants between the antibiotic ristocetin A (Rist A) and D-Ala-D-Ala terminus peptides were determined using affinity
capillary electrophoresis (ACE). In these experiments two techniques are used to obtain binding constants. In the first, a
plug of Rist A and non-interacting standards are injected and electrophoresed. Analysis of the change in the relative migration
time ratio (RMTR) of Rist, relative to the non-interacting standards, as a function of the concentration of peptide, yields a value for the
binding constant (Kb). In the second, samples of peptide and standards are injected and electrophoresed in increasing concentrations of Rist A
in the running buffer. Analysis using theRMTR yields aK
b. The findings described here demonstrate the advantage of using ACE for estimating binding parameters between antibiotics
and ligands. 相似文献
157.
A ribose-functionalized bpy ligand has been prepared and shown to give modest diastereomeric excesses of Lambda-[FeL(3)](2+) complexes; interconversion of Delta and Lambda cations is relatively fast, and in CHCl(3), the favored complexes with Delta- or Lambda-TRISPHAT counterions are homochiral, (Delta(+)Delta(-)) or (Lambda(+)Lambda(-)). In the case of the Delta-TRISPHAT salt, a single diastereomer is observed (de > or = 96%). 相似文献
158.
Improving the Photocatalytic Activity of Modified Anatase TiO2 with Different Concentrations of Aluminum under Visible Light: Mechanistic Survey
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Shahrara Afshar Shabnam Pordel Babak Tahmouresilerd Alireza Azad 《Photochemistry and photobiology》2016,92(6):783-789
Visible light‐driven Al‐doped TiO2 with different aluminum contents (2, 5 and 10 mol%) were synthesized via a facile sol–gel method. Fourier transform infrared (FTIR), UV‐visible diffuse reflectance, energy dispersive X‐ray (EDX) spectroscopy as well as X‐ray diffraction (XRD), X‐ray fluorescence (XRF) and scanning electron microscopy (SEM) methods were used for the characterization of the obtained nanoparticles. The photocatalytic performance of the samples was evaluated by the degradation of rhodamine B (RhB) under visible light irradiation. The yield of the degradation RhB was estimated to be 71%, 89%, 65% and 56%, for the bare TiO2, 2%, 5% and 10% Al‐doped TiO2, respectively. It was found that 2 mol% of Al‐doped TiO2 shows the best photocatalytic performance. In low concentration of dopant, separation of photogenerated electron–hole pairs promoted, and subsequently, the degradation efficiency increased. It was proposed that the degradation of RhB by 2 mol% Al‐doped TiO2 photocatalyst follows both N‐deethylation and chromophore cleavage mechanisms, while the N‐deethylation still predominated over cleavage of dye chromophore structure. The key role of hydroxyl radicals in RhB degradation was verified by the effects of scavengers. In addition, the photocatalyst can be reused for three runs without any significant loss of its catalytic activity. 相似文献
159.
We investigate the effect of metal permittivity on resonant transmission of metamaterials by terahertz time-domain spectroscopy. Our experimental results on double split-ring resonators made from different metals confirm the recent numerical simulations [Phys. Rev. E 65, 036622 (2002)] that metamaterials exhibit permittivity-dependent resonant properties. In the terahertz regime, the measured inductive-capacitive resonance is found to strengthen with a higher ratio of the real to the imaginary parts of metal permittivity, and this remains consistent at various metal thicknesses. Furthermore, we found that metamaterials made even from a generally poor metal become highly resonant owing to a drastic increase in the value of the permittivity at terahertz frequencies. 相似文献
160.
Na4ReN3, the First Alkali Metal Nitridorhenate(V) Rhenium powder reacts in a mixture with NaNH2 in autoclaves at 773 K to orange colored crystals embedded in a matrix of sodium metal. After extracting the sodium metal with liquid ammonia single crystals were seperated. The structure was solved by X‐ray single crystal methods and for the evaluation of the correct space group by optical SHG experiments: spacegroup Cc (No. 9), Z = 4, a = 10.903(2) Å, b = 6.022(1) Å, c = 8.944(2) Å, β = 115.57(3)°. The structure contains trigonal pyramidal anions ReN34–, which are embedded in three‐dimensionally linked, fourfold capped cubes of 12 Na. 相似文献