醛酮化合物色谱保留指数的集成全息定量构效关系模型

色谱保留指数(retention index,RI)是色谱分析中的重要参数,不同化合物在不同极性固定相上具有不同的保留行为.醛酮化合物种类众多,实验测定其RI值的时间和经济成本高.该论文采用集成建模(ensemble modeling)结合全息定量构效关系(HQSAR)方法研究了醛酮化合物在2种固定相(DB-210和H...     

Synthesis and Crystal Structure of α,α,β,β-5,10,15,20-Tetrakis（2-aminophenyl）porphyrin

The title compound,α,α,β,β-5,10,15,20-tetrakis（2-aminophenyl）porphyrin, has been obtained and characterized by single-crystal X-ray diffraction. The crystal belongs to the monoclinic system, space group C2/c with a = 31.804（6）, b = 19.314（4）, c = 12.872（3） A, β= 90.592（3）°, Z = 4, V = 7907（3） A^3, Dc= 1.193 g/cm^3, Mr= 1419.67, λ（MoKα） = 0.71073A, μ= 0.073 mm^-1, F（000） = 2984, R = 0.0773 and wR = 0.2045. The crystallographic analysis indicates the existence of N-H...π intermolecular interactions and hydrogen bonds which link the complex molecules into a 3D network structure.     

Synthesis and Crystal Structure of a 1-D Copper(Ⅱ) Polymer with 1-Hexylimidazole and Oxalate

A novel Cu(Ⅱ) complex has been prepared by means of self-assembly of CuCl2,1-hexylimidazole L and oxalic acid(H2OX) in the presence of triethylamine,and structurally characterized by X-ray diffraction analysis.In complex 1,1-D polymer chains are formed through pentacoordinated Cu(Ⅱ),oxalate and bridging chlorine atoms.In the crystal packing of 1,the imidazole ring head-to-tail π-π stacking interactions exist between 1-D polymer chains and extend the 1-D polymer chains into 2-D supramolecular layers.The fluorescence emission spectra of L and 1 were described.     

图犹豫模糊Power Heronian平均算子及其在多属性决策中应用

针对需要同时考虑属性关联性及整体均衡性多属性决策问题,联合图犹豫模糊集对于不确定信息的表达优势,提出一种基于图犹豫模糊Power Heronian平均算子的多属性决策方法。首先,给出图犹豫模糊数的得分函数、精确函数及距离公式;在此基础上,提出图犹豫模糊Power Heronian平均算子和图犹豫模糊Power加权Heronian平均算子;最后,将所提算子应用于多属性决策问题中,验证所提算子的有效性和可行性。     

Bimetallic Sulfide/Sulfur Doped T3C2Tx MXene Nanocomposites as High-performance Anode Materials for Sodium-ion Batteries

The application of transition metal dichalcogenides(TMDs) as anode materials in sodium-ion batteries (SIBs) has been hindered by low conductivity and poor cyclability. Herein, we report the synthesis of Co_xFe_1-xS₂ bimetallic sulfide/sulfur-doped Ti₃C₂ MXene nanocomposites(Co_xFe_1-xS₂@S-Ti₃C₂) by a facile co-precipitation process and thermal-sulfurization reaction. The interconnected 3D frameworks consisting of MXene nanosheets can effectively buffer the volume change and enhance the charge transfer. In particular, sulfur-doped MXene nanosheets provide rich active sites for sodium storage and restrain sulfur loss during charging/discharging processes, leading the increase of specific capacity and cycling the stability of anode materials. As a result, Co_xFe_1-xS₂@S-Ti₃C₂ anodes exhibited high capacity, high rate capability and long cycle life(399 mA·h/g at 5 A/g with an 94% capacity retention after 600 cycles).     

In[(C2H5O)2PS2]3配合物的合成及晶体结构研究

稀散元素材料已成为当代高新技术领域的重要支撑材料,其中铟应用于液晶材料(ITO)的研究与开发^[1,2].烷基二硫代磷酸酯具有优良的配位性能,可用作石油添加剂和高聚物防老化剂^[3,4].因此,目前对稀散元素烷基硫代配合物研究十分活跃.     

Analysis of Rhenium in the Copper Smoke ash by Spectrophotometry

Perrhenate ions reacts with methyl violet in a buffer media of Na₂HPO₄-citric acid ranging from PH 2.0-3.0 containing ammonium Sulfate and tartratic acid forming a blue green ion-association complex and soluble in benzene.     

氢化物发生-原子荧光光谱法同时测定高纯铟中As、Sb

研究了氢化物发生-原子荧光光谱法测定高纯铟中微量As、Sb元素的条件,选择了适宜的反应条件以及仪器的最佳工作条件,考察了铟基体对被测元素的干扰,采用基体匹配的方法消除干扰,建立了氢化物发生-原子荧光光谱法测定高纯铟中微量的As、Sb的分析方法。As、Sb的检出限分别为0.18和0.28 ng/mL,测定下限为1.2×10-5和1.9×10-5,相对标准偏差分别为1.9%和1.7%,回收率为97.4%和103%,适用于5～6 N高纯铟中微量As、Sb的测定。     

CdS纳米粒子的水热微乳法制备

0引言CdS是一种重要的Ⅱ-Ⅵ族半导体,其独特的光电化学性能引起人们的广泛关注,而其性能与晶粒尺寸、晶体结构等密切相关,因而CdS的纳米结构的研究备受关注[1￣3]。目前,制备CdS纳米粒子的主要方法有溶剂热法[4],化学浴沉积法[5],微乳液法[6]等。微乳液是合成球形纳米粒子的良好介质,具有实验装置简单,操作方便,应用领域广并且有可控制微粒的粒度等优点[7]。但其在室温条件下合成的CdS粒子的结晶性较差,严重影响其光电性能。Gan和Liu等[8]曾在NP5-NP9/PE/SOL微乳液中,在室温及水热条件下合成ZnS:Mn发光纳米材料,来提高在微乳液中制…     

基于连续正弦速度扫描方式的激光多普勒测振技术

本文针对逐点扫描激光多普勒非接触测振技术只能进行离散空间域振动测试的缺陷,研究了基于连续正弦速度扫描方式的激光多普勒测振新技术,实现了连续空间域的振动测试。并以简支梁为测试对象,进行了实验验证。实验结果表明:应用连续扫描激光多普勒测振技术与扫描激光多普勒测振技术获取的模态振型匹配一致,而且前者在测试时间、测试数据量及空间分辨率上都优于后者。