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991.
采用SCC-DV-Xα方法对α-Keggin结构硅钼二电子还原态杂多蓝阴离子[SiMo2(V)Mo10(VI)O40]6-和它的混合型钒取代物[SiV2(V)Mo10(VI)O40]6-进行了量子化学计算,获得了轨道能级、费米能级、各原子价电子布居、自由价态密度分析和分子轨道成分等信息.理论分析表明该杂多阴离子中所有原子Si、Mo、V、Oa、Ob、Oc和Od都参与反应,Oc和Od的成键能力较强,化学活性较大,有力地支持了实验结果.中心硅氧四面体结构发生畸变很小,但构成三金属簇的八面体结构都发生了较明显的畸变,其整体仍然保持α-Keggin结构.钒的取代增强了Mo2VO13三金属族中Od的活性.预测这两种杂多阴离子都有被继续还原和取代的趋势,[SiMo2(V)Mo10(VI)O40]6-的趋势更强. 相似文献
992.
Yutong Fu Xinyu Xia Yan Zhang Jinhai Ye Meidong Lang 《Colloid and polymer science》2014,292(9):2071-2082
Functional star-shaped 4-arm poly(ethylene glycol)-b-poly[(ε-caprolactone-co-γ-amino-ε-caprolactone)] (4-arm PEG-b-P(CL-co-ACL) was synthesized through ring-opening polymerization. The structure of the copolymer was confirmed by 1H NMR, Fourier transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). To further understand the copolymers, the difference of the conversion rate between ε-caprolactone (CL) and γ-(carbamic acid benzyl ester)-ε-caprolactone (CABCL) and the detailed deprotection condition were studied. The thermal property of the copolymer was analyzed by WAXR and differential scanning calorimetry (DSC), which demonstrated that the thermal property could be well adjusted. The pH-responsive behavior of the copolymers was studied in detail by dynamic light scattering (DLS), pH titration, and pyrene fluorescence methods, which indicated that it could form micelles and exhibit pH responsibility. Moreover, the copolymer was nontoxic and had good biocompatibility according to the results by 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di-phenytetrazoliumromide (MTT) assay. 相似文献
993.
Determination of arsenic species in Solanum Lyratum Thunb using capillary electrophoresis with inductively coupled plasma mass spectrometry 下载免费PDF全文
Pei‐Yu Shuai Xiao‐Jun Yang Zong‐Qing Qiu Xiao‐Hui Wu Xi Zhu Ganga Raj Pokhrel Yu‐Ying Fu Hui‐Min Ye Wen‐Xiong Lin Gui‐Di Yang 《Journal of separation science》2016,39(16):3239-3245
A simple and highly efficient interface to couple capillary electrophoresis with inductively coupled plasma mass spectrometry by a microflow polyfluoroalkoxy nebulizer and a quadruple ion deflector was developed in this study. By using this interface, six arsenic species, including arsenite, arsenate, monomethylarsonic acid, dimethylarsinic acid, arsenobetaine, and arsenocholine, were baseline‐separated and determined in a single run within 11 min under the optimized separation conditions. The instrumental detection limit was in the range of 0.02–0.06 ng/mL for the six arsenic compounds. Repeatability expressed as the relative standard deviation (n = 5) of both migration time and peak area were better than 2.5 and 4.3% for six arsenic compounds. The proposed method, combined with a closed‐vessel microwave‐assisted extraction procedure, was successfully applied for the determination of arsenic species in the Solanum Lyratum Thunb samples from Anhui province in China with the relative standard deviations (n = 5) ≤4%, method detection limits of 0.2–0.6 ng As/g and a recovery of 98–104%. The experimental results showed that arsenobetaine was the main speciation of arsenic in the Solanum Lyratum Thunb samples from different provinces in China, with a concentration of 0.42–1.30 μg/g. 相似文献
994.
本文系统研究了NO在Ir(111)表面的吸附,解离,以及可能的N_2生成机理.结果表明,顶位吸附的NO,其解离能垒较高(3.17 eV),不会发生解离,而三重Hcp和Fcc空位吸附的NO发生解离,能垒分别为1.23和1.28 eV.N_2是唯一的生成物,不会有副产物N_2O的产生.其最可能的反应路径为N和NO经过N_2O中间体而生成N_2,而不是直接N提取和N-N聚合产生N_2的机理. 相似文献
995.
W.C. Chen R. Erwin J.W. McIver III S. Watson C.B. Fu T.R. Gentile J.A. Borchers J.W. Lynn G.L. Jones 《Physica B: Condensed Matter》2009,404(17):2663-2666
At the NIST Center for Neutron Research (NCNR), we have applied 3He neutron spin filters (NSFs) to the instruments where 3He NSFs are advantageous, such as thermal triple-axis spectrometry, small-angle neutron scattering, and diffuse reflectometry. We present the status of our development and application of this method, including polarized gas production by spin-exchange optical pumping, magnetostatic cavities for storage of the polarized gas on the beam line, and nuclear magnetic resonance (NMR)-based, on-line monitoring and reversal of the 3He polarization. We present the status of developing user-friendly interfaces incorporated into the instrument software to handle these 3He neutron spin filters while taking data and performing data analysis. Finally we discuss the status of development of a polarization capability on the multi-axis crystal spectrometer, which requires polarization analysis over a 220° angular range. 相似文献
996.
柱上衍生反相色谱法测定金属配合物的稳定常数 总被引:7,自引:0,他引:7
提出一种计算金属配合物稳定常数的新方法。应用住上衍生反相高效液相色谱法,以二乙基二硫代氨基甲酸钠为配体,测定金属配合物的保留时间,用以推导金属配合物的稳定常数。 相似文献
997.
Fu Qiang Huang 《Journal of solid state chemistry》2003,174(2):334-341
Three new compounds, Cs2Bi2ZnS5, Cs2Bi2CdS5, and Cs2Bi2MnS5, have been synthesized from the respective elements and a reactive flux Cs2S3 at 973 K. The compounds are isostructural and crystallize in a new structure type in space group Pnma of the orthorhombic system with four formula units in cells of dimensions at 153 K of a=15.763(3), b=4.0965(9), c=18.197(4) Å, V=1175.0(4) Å3 for Cs2Bi2ZnS5; a=15.817(2), b=4.1782(6), c=18.473(3) Å, V=1220.8(3) Å3 for Cs2Bi2CdS5; and a=15.830(2), b=4.1515(5), c=18.372(2) Å, V=1207.4(2) Å3 for Cs2Bi2MnS5. The structure is composed of two-dimensional ∞2[Bi2MS52−] (M=Zn, Cd, Mn) layers that stack perpendicular to the [100] axis and are separated by Cs+ cations. The layers consist of edge-sharing ∞1[Bi2S66−] and ∞1[MS34−] chains built from BiS6 octahedral and MS4 tetrahedral units. Two crystallographically unique Cs atoms are coordinated to S atoms in octahedral and monocapped trigonal prismatic environments. The structure of Cs2Bi2MS5, is related to that of Na2ZrCu2S4 and those of the AMM′Q3 materials (A=alkali metal, M=rare-earth or Group 4 element, M′= Group 11 or 12 element, Q=chalcogen). First-principles theoretical calculations indicate that Cs2Bi2ZnS5 and Cs2Bi2CdS5 are semiconductors with indirect band gaps of 1.85 and 1.75 eV, respectively. The experimental band gap for Cs2Bi2CdS5 is ≈1.7 eV, as derived from its optical absorption spectrum. 相似文献
998.
Yang Yang Tao Jia Ying‐Zi Han Zi‐Ang Nan Shang‐Fu Yuan Feng‐Lei Yang Di Sun 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(35):12408-12413
The hardness of oxo ions (O2?) means that coinage‐metal (Cu, Ag, Au) clusters supported by oxo ions (O2?) are rare. Herein, a novel μ4‐oxo supported all‐alkynyl‐protected silver(I)–copper(I) nanocluster [Ag74?xCuxO12(PhC≡C)50] ( NC‐1 , avg. x=37.9) is characterized. NC‐1 is the highest nuclearity silver–copper heterometallic cluster and contains an unprecedented twelve interstitial μ4‐oxo ions. The oxo ions originate from the reduction of nitrate ions by NaBH4. The oxo ions induce the hierarchical aggregation of CuI and AgI ions in the cluster, forming the unique regioselective distribution of two different metal ions. The anisotropic ligand coverage on the surface is caused by the jigsaw‐puzzle‐like cluster packing incorporating rare intermolecular C?H???metal agostic interactions and solvent molecules. This work not only reveals a new category of high‐nuclearity coinage‐metal clusters but shows the special clustering effect of oxo ions in the assembly of coinage‐metal clusters. 相似文献
999.
1000.
Expeditious Synthesis of Enantiopure,Orthogonally Protected Bis‐α‐Amino Acids (OPBAAs) and their Use in a Study of Nod1 Stimulation 下载免费PDF全文
Po‐Ting Chen Cheng‐Kun Lin Chih‐Ju Tsai Dr. Duen‐Yi Huang Fu‐Yao Nien Dr. Wan‐Wan Lin Prof. Dr. Wei‐Chieh Cheng 《化学:亚洲杂志》2015,10(2):474-482
A convenient approach towards the synthesis of orthogonally protected chiral bis‐α‐amino acids (OPBAAs) is described. The key transformations include: (1) a highly stereoselective conjugation (alkylation) of the Schöllkopf bis‐lactim ethers and oxazolidinyl alkyl halides to build a backbone skeleton; and (2) our orthogonal protection strategy. A series of enantiopure OPBAAs bearing a variety of alkyl chain as a spacer; two stereogenic centers; and three protecting groups were prepared as examples. These versatile molecules were applied to the synthesis of biologically interesting di‐ or tri‐peptide analogues, including chiral iE‐meso‐DAP and A‐iE‐meso‐DAP, for the study of Nod1 activation in the innate immune response. 相似文献