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121.
Humayun Ajaz Sajjad Hussain Muhammad Altaf Helen Stoeckli‐Evans Anvarhusein A. Isab Rashid Mahmood Shahnila Altaf Saeed Ahmad 《中国化学》2011,29(2):254-258
Antimony(III) complexes of thioamides [thioamides=thiourea (Tu), N,N′‐dimethylthiourea (Dmtu), tetramethylthiourea (Tmtu), imidazolidine‐2‐thione (Imt) and diazinane‐2‐thione (Diaz)] with the general formulae, Sb(thione)nCl3 (n=1, 2, 2.5, 3) were prepared and characterized by elemental analysis, IR and NMR (1H, 13C) spectroscopic methods. The spectral data of the complexes are consistent with the coordination of the thiones to antimony(III). The crystal structure of one of them, {[Sb(Imt)2Cl2]2(μ2‐Imt)}Cl2 ( 1 ), was determined by X‐ray crystallography, which shows that the complex is dinuclear consisting of two [Sb(Imt)2Cl2] units bridged by an Imt molecule. In 1 , the antimony atom is bonded to two chlorine atoms, two sulfur atoms of coordinated Imt molecules and one sulfur atom of a bridging Imt molecule. The antimony environment can be considered to be distorted octahedral with one Cl? ion weakly bound to antimony. 相似文献
122.
A method for obtaining collisional activation spectra at much higher resolving power than before by use of a collision chamber and a B/E linked scan, is described. 相似文献
123.
124.
The volumetric productivity of many fermentations is productlimited.In situ removal of these products with liquid organic extractants is limited by either a low product distribution coefficient or
toxicity of the extractant. This paper presents results from studies using mixed extractants, namely mixtures of toxic extractants
that have high distribution coefficients for the product and nontoxic extractants that have low distribution coefficients.
The production of butanol byClostridium acetobutylicum was chosen as a model system for these studies. The mechanisms of toxicity of mixed extractants and the observed responses
to their presence are discussed. 相似文献
125.
126.
非平衡晶化控制水滑石晶粒尺寸 总被引:13,自引:0,他引:13
本文采用非平衡晶化法通过在晶化后期补加原料合成了一系列不同晶粒尺寸的水滑石(LDH)样品,研究表明:非平衡晶化法可在一定范围内调控LDH的粒径,所合成的LDH样品组成稳定,晶体结构完整。 相似文献
127.
Field-portable, high-speed GC/TOFMS 总被引:1,自引:0,他引:1
Syage JA Nies BJ Evans MD Hanold KA 《Journal of the American Society for Mass Spectrometry》2001,12(6):648-655
This work is focused on developing a fast gas chromatograph, time-of-flight mass spectrometer (GC/TOFMS) for man-portable field use. The goal is to achieve a total system solution for meeting performance, size, weight, power, cost, and ruggedness requirements for a laboratory in the field. The core technology will also be adaptable to specific applications including real-time point detection for hazardous chemical releases (e.g., chemical weapons), for biological agent signature identification, and for mobile monitoring platforms (e.g., air, ship, truck). Previously we presented results of a feasibility demonstration for a 30-lb field-portable TOFMS system. In this work we present recent progress in integrating a low-power, high-speed GC and show the capability for accurately recording fast GC transients for targeted compound detection using a quadrupole ion trap, time-of-flight instrument (QitTof). 相似文献
128.
Michael Appell Kervin O. Evans David L. Compton Lijuan C. Wang Wayne B. Bosma 《Structural chemistry》2018,29(3):715-723
A time-dependent density functional theory (TD-DFT) study was carried out on tautomers of the mycotoxin citrinin in the neutral, anionic, and cationic forms to gain insight into the role of chemical structure on detection. Steady-state fluorescence studies of citrinin in micellar aqueous solutions produced unusual results for ionic surfactants and the neutral Triton X-100 enhanced fluorescence emission. Ground-state and time-dependent density functional studies were carried out on five tautomers of citrinin using the B3LYP density functional and the 6-311+G(2df,2p) basis set. The investigation revealed that deprotonation is a major factor governing the shifts in fluorescence excitation and emission maxima. Moreover, the position of the lowest unoccupied molecular orbitals is removed from the fluorophore moiety of citrinin in the dianionic state which is consistent with the diminished fluorescence of the toxin in basic solutions. The ionic characteristics of certain chemosensors can influence the structure and intrinsic spectroscopic properties of citrinin. 相似文献
129.
Dr. Paul J. Evans Dr. Jiangkun Ouyang Dr. Ludovic Favereau Dr. Jeanne Crassous Dr. Israel Fernández Dr. Josefina Perles Prof. Dr. Nazario Martín 《Angewandte Chemie (International ed. in English)》2018,57(23):6774-6779
A rigid, inherently chiral bilayer nanographene has been synthesized as both the racemate and enantioenriched M isomer (with 93 % ee) in three steps from established helicenes. This folded nanographene is composed of two hexa‐peri‐hexabenzocoronene layers fused to a [10]helicene, with an interlayer distance of 3.6 Å as determined by X‐ray crystallography. The rigidity of the helicene linker forces the layers to adopt a nearly aligned AA‐stacked conformation, rarely observed in few‐layer graphene. By combining the advantages of nanographenes and helicenes, we have constructed a bilayer system of 30 fused benzene rings that is also chiral, rigid, and remains soluble in common organic solvents. We present this as a molecular model system of bilayer graphene, with properties of interest in a variety of potential applications. 相似文献
130.
Regioselective and enantiospecific rhodium-catalyzed allylic amination with N-(arylsulfonyl)anilines
[reaction: see text]. The regioselective and enantiospecific rhodium-catalyzed allylic amination of secondary allylic carbonates 1 with N-(arylsulfonyl)anilines provides a convenient process for the construction of arylamines 2. This method, in conjunction with ring-closing metathesis and radical cyclization reactions, allows the direct construction of biologically relevant pharmacophores as exemplified by the construction of dihydroquinoline and dihydrobenzo[b]indoline derivatives. 相似文献