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排序方式: 共有223条查询结果,搜索用时 187 毫秒
41.
42.
Konstantinos Chondroudis Debojit Chakrabarty Enos A. Axtell Mercouri G. Kanatzidis 《无机化学与普通化学杂志》1998,624(6):975-979
The reaction of one equivalent of In with a molten flux of (Ph4P)2Se5 and P2Se5 (1 : 2), at 250 °C gave the (Ph4P)[In(P2Se6)] ( I ). Stoichiometric elemental synthesis at 750 °C produced the Cs5In(P2Se6)2 ( II ). The thin, yellow crystals of ( I ), and the irregular, dark orange crystals of ( II ), appear to be air- and water-stable. Compound ( I ) crystallizes in the monoclinic space group C2/c (no. 15) and at 23 °C: a = 23.127(7) Å, b = 6.564(1) Å, c = 19.083(3) Å, β = 97.42(2)°, V = 2873(1) Å3, Z = 4, final R/Rw = 4.4/5.2%. Compound ( II ) crystallizes in the tetragonal space group P42/m (no. 84) and at 23 °C: a = b = 13.886(1) Å, c = 7.597(2) Å, V = 1464.9(3) Å3, Z = 2, final R/Rw = 3.9/5.1%. Compound ( I ) contains infinite [In(P2Se6)]nn– with a structure related to that of K2FeP2Se6. Compound ( II ) contains the discrete [In(P2Se6)2]5– which can be viewed as a fragment of the [In(P2Se6)]nn– chain. 相似文献
43.
We report herein a pseudo-crown based fluorescent receptor (1) for the selective detection of Cu2+ cation. Receptor 1 can detect Cu2+ even in 5 μM level in acetonitrile-water (9:1 v/v). Compound 1 is very effective for the detection of Cu2+ amongst the series of metal ions studied (Li+, Na+, K+, Ca2+, Mg2+, Ba2+, Pb2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+, Hg2+ and Mn2+). 相似文献
44.
Anirbandeep Bose Uttam Bhaumik Animesh Ghosh Bappaditya Chatterjee Uday Sankar Chakrabarty Amlan Kanti Sarkar Tapan Kumar Pal 《Chromatographia》2009,69(11-12):1233-1241
A rapid, simple, sensitive and specific liquid chromatography–tandem mass spectrometry method was developed and validated for simultaneous quantification of itopride hydrochloride and domperidone in human plasma. Both drugs were extracted by liquid–liquid extraction with ethyl acetate and saturated borax solution. The chromatographic separation was performed on a reversed-phase C18 column with a mobile phase of water–methanol (2:98, v/v) containing 0.5% formic acid. The protonated analyte was quantitated in positive ionization by multiple reaction monitoring with a mass spectrometer. The assay exhibited linearity over the concentration range of 3.33–500 ng mL?1 for itopride hydrochloride and 3.33–100 ng mL?1 for domperidone in human plasma. The precursor to product ion transitions of m/z 359.1–72.3 and 426.0–147.2 were used to measure itopride hydrochloride and domperidone respectively. The method was found suitable for the analysis of plasma samples collected during phase 1 pharmacokinetics study of itopride HCl 50 mg and domperidone 20 mg in 12 healthy volunteers after single oral doses of the combination drug. 相似文献
45.
We call a market competitive if increasing the endowment of one buyer does not increase the equilibrium utility of another. We show that every competitive uniform utility allocation market is a submodular utility allocation market, answering a question of Jain and Vazirani [K. Jain, V.V. Vazirani, Eisenberg-Gale markets: Algorithms and structural properties, in: STOC, 2007]. Our proof proceeds via characterizing non-submodular fractionally sub-additive functions. 相似文献
46.
S. M. Aksenov R. K. Rastsvetaeva R. H. Mitchell A. Chakrabarty 《Crystallography Reports》2014,59(2):146-154
The crystal structure of eudialyte of hydrothermal genesis from Sushina Hill, India, where it was found associated with potassium feldspathoid, albite, aegirine, and nepheline, has been solved by X-ray diffraction analysis. One specific feature of the chemical composition of this mineral is a low content of CaO (7–8.5 wt %) and an elevated manganese content (9–10.5 wt % MnO). When compared with eudialytes of magmatic genesis, this eudialyte is enriched in Nb, Sr, Y, and rare earth elements (REEs). It is described within the sp. gr. R3m, with the unit-cell parameters a = 14.2483(3) Å and b = 30.294(1) Å; R = 4.7%. The idealized formula (Z = 3) is (Na,□,Sr)15(Ca,Mn)6Mn3(Si,Nb)2Zr3[Si24O72](OH,Cl,H2O)5.5. It is established that Mn atoms occupy three sites: two subsites in five-vertex polyhedra M2a and M2b, spaced by a distance of 0.87 Å and characterized by occupancies of 0.51 and 0.49, respectively, and the M1 site in the octahedron of six-membered ring, jointly with Ca and REE. With allowance for the established features of chemical composition and structure, the mineral under study can be considered as a strontium-rich variety of kentbrooksite. 相似文献
47.
Chatterjee S Choudhury SD Basu S Ghosh N Chakrabarty M 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2004,60(1-2):97-102
With the advent of spin chemistry, magnetic field effect (MFE) on exciplex luminescence has emerged as an important domain of research. MFE is a diffusion controlled phenomenon and hence is solvent dielectric (epsilon) dependent. It maximizes at a particular epsilon (epsilon(max)) for a specific exciplex system. Various attempts have been made to explain the variation of this epsilon(max) from one exciplex to another. In our present work we have succeeded for the first time to enmark the energy of exciplex (E(ex)) as the prime factor in determining the epsilon(max). We have indicated a definite inverse correlation (1:1) between epsilon(max) and E(ex). We have also tried to correlate some parameters that are important in exciplex formation, e.g. Charton's steric constant (nu(c)), repulsive energy (R(e)) and E(ex). 相似文献
48.
We describe the use of a strain-promoted copper-free click reaction in the post-self-assembly functionalization of organoplatinum(II) metallacycles. The coordination-driven self-assembly of a 120° cyclooctyne-tethered dipyridyl donor with 60° and 120° di-Pt(II) acceptors forms molecular rhomboids and hexagons bearing cyclooctynes. These species undergo post-self-assembly [3+2] Huisgen cycloaddition with a variety of azides to give functionalized ensembles under mild conditions. 相似文献
49.
Experimental investigations in fluid flow and heat transfer have been carried out to study the effect of wall proximity due
to flow separation around a square prism at Reynolds number 2.6 × 104, blockage ratio 0.1, different height-ratios and various angles of attack. The static pressure distribution has been measured
on all faces of the square prism. The results have been presented in the form of pressure coefficient, drag coefficient for
various height-ratios. The pressure distribution shows positive values on the front face whereas on the rear face negative
values of the pressure coefficient have been observed. The positive pressure coefficient for different height-ratios does
not vary too much but the negative values of pressure coefficient are higher for all points on the surface as the bluff body
approaches towards the upper wall of the wind tunnel. The drag coefficient decreases with the increase in angle of attack
as the height-ratio decreases. The maximum value of drag coefficient has been observed at an angle of attack nearly 50° for
the square prism at all height-ratios. The heat transfer experiments have been carried out under constant heat flux condition.
Heat transfer coefficient are determined from the measured wall temperature and ambient temperature and presented in the form
of Nusselt number. Both local and average Nusselt numbers have been presented for various height-ratios. The variation of
local Nusselt number has been shown with non-dimensional distance for different angles of attack. The variation of average
Nusselt number has also been shown with different angles of attack. The local as well as average Nusselt number decreases
as the height-ratio decreases for all non-dimensional distance and angle of attack, respectively, for the square prism. The
average Nusselt number for the square prism varies with the angle of attack. But there is no definite angle of attack at which
the value of average Nusselt number is either maximum or minimum. 相似文献
50.