Zn(Oxin)2·2H2O纳米晶的固相化学反应合成及表征

随着纳米微粒研究的深入,对纳米超细微粒提出了不同的物理、化学特性需求,制备高纯、超细、均匀的纳米微粒,发展新型的纳米材料,就显得非常重要,而解决问题的关键在于研究、发展新的合成技术.通常,纳米微粒制备的要求是:表面洁净;粒子形状及粒径、粒度分布可控,防止粒子团聚;易于收集;有较好的稳定性;产率高.     

The photoluminescence of Co-Al-layered double hydroxide

We report a new optical behaviour of pure Co-Al-layered double hydroxide (LDH).It was found that the Co-Al-LDH sample could emit fluorescence without any fluorescent substances intercalated.Its excitation spectrum shows a maximum peak near the wavelength 370nm,the maximum emission peak appears at 430 nm and the photoluminescence colour of the Co-Al-LDH sample is blue.This new optical property will be expected to extend the potential applications of LDHs in optical materials field.     

DL－苹果酸－丙酮－BrO~3^-－Mn^2^+－H~2SO~4化学振荡 反应诱导期的新特征 及其动力学研究

在前文研究工作的基础上,较详细地研究了DL-苹果酸(以下简称DL-MA)、丙酮(以下简称Act)参与下的新型化学振荡反应及各种影响因素,对各主要参与反应物质在诱导期中的作用、起振原因、诱导期的新特征和可能反应机理进行了较为深入的研究,分别获得DL-MA,KBrO~3,MnSO~4的浓度对诱导期影响的拟合方程。以及诱导期的表观活化参数为E~I~N=68.50kJ·mol^-^1。     

Mechanisms and Kinetics of Reactions of the O（^1D,^3P） ＋ CF3Cl System

In the stratosphere,CF3Cl(CFC13)can either photodecompose or react directly with atomic oxygen to generate ozone-depleting agents such as Cl and ClO in the gas phase[1—3].Since the1970s,attention has been focused on the effects of these compounds on the …     

Sesquiterpenoids from Chloranthus spicatus （Thunb.） Makino

Two new sesquiterpenoids, namely 1β,4β-dihydroxy-5 α,8β（H）-eudesm-7（11）Z-en-8,12-olide （1） and 1β,4α-dihydroxy-5α,8β（H）-eudesm-7（11）Z-en-8,12-olide （2）, along with six known ones, homalomenol A （3）, oplodiol （4）, 5α,7α（H）-6,8-cycloeudesma-1β,4β-diol （5）, oplopanone （6）, 4β,10α-dihydroxyaromadendrane （7） and spathulenol （8）, were isolated from the aerial part of Chloranthus spicatus （Thunb.） Makino, and their structures were established by spectroscopic methods.     

Two new megastigmane O-glucopyranosides from the leaves of Broussonetia papyrifera

Two new megastigmane O-glucopyranosides,named (2R,3R,5R,6S,9R)-3-hydroxy-5,6-epoxy-β-ionol-2-O-β-D-glucopyrano- side(1) and (2R,3R,5R,6S,9R)-3-hydroxyl-5,6-epoxy-acety-β-ionol-2-O-β-D-glucopyranoside(2) together with six known mega- stigmanes,were isolated from the leaves of Broussonetia papyrifera (Linn.) Vent.Their structures were established by chemical methods and spectroscopic techniques including 2D NMR.     

臭氧催化分解异相反应新机理

极地云表面上的异相反应在春季南极臭氧空洞形成中起关键作用。本文主要介绍了极地云表面上异相反应两个机理 ,其中的新机理同样适用于另外一些凝聚相和表面体系中的异相反应。     

化学反应的内禀反应坐标法VI. 甲胺脱氢反应的反应路径解析

本文用内禀反应坐标(IRC)法对甲胺的1,1-和1,2-脱氢反应途径进行了微观动力学解析。在RHF/4-31G水平上确定了反应的过渡态结构和势能变化曲线,得到了活化能、反应热、频率因子和活化熵等物理量。模式选择研究表明:1,1-和1,2-脱氢反应过程的反应坐标(IRC)分别与反应物中频率为1057和1348cm^-^1的两个变形振动模式相联结。在每条反应途径上都存在正则坐标间的振动耦合。本文的计算为激光诱导和模式选择化学反应的研究提供了重要信息和理论指导。     

Ag(TCNQ)准一维微米结构的制备及表征

利用溶液化学反应法制备了准一维结构的金属有机配合物Ag(TCNQ). X射线衍射(XRD)表明，所制备的Ag(TCNQ)为晶态结构;扫描电子显微镜(SEM)的观察证明，Ag(TCNQ)为准一维的微米管或线；Raman 测试结果表明，单根的Ag(TCNQ)形成时,Ag原子与TCNQ分子之间发生了电荷转移.对样品的制备工艺,即 Ag膜厚度和浸入溶液的反应时间对生成Ag(TCNQ)晶体形貌的影响进行了研究.结果表明，Ag膜越薄，生长出的晶体越稀疏;Ag膜与TCNQ乙腈溶液的反应时间影响其形貌的变化.反应历经三个阶段,晶体形成和长大阶段、反应完全阶段及溶解阶段.     

电渗流与缓冲液浓度之间数学关系的线性表达

It was believed that electroosmotic mobility μeo is inversely proportional to the square root of the ionic strength L But the linear relationship for regression analysis was expressed differently in different papers. The paper studied the linear expression of the mathematical relationship between μeo and c （background buffer concentration） by mathematical transform and real experimental data.μeo values of fused silica capillary were determined in four buffer systems. Their experimental conditions were controlled carefully for decreasing temperature difference AT and pH difference ApH in 50 μm ID capillary, in which no double layer overlap existed. The linear relationship between the reciprocal of electroosmotic mobility and the square root of concentration （or ionic strength） was derived by mathematical method. The regression analysis of experimental data was shown to well correspond to the relationship. The constants in regression equation could be well defined and the calculated results were acceptable.