Investigation of Isomerization of 2—Seleno—1,3,2—diazaphospholidine Derivatives

For the first time the isomerization of 1,3,2-diazaphospholidine-2-sclenide dervatives in refluxing benzene in the presence of trace water was observed. The structures of isomerized products were determined by IR, ^1H NMR,^31P NMR, elemental analysis and X-ray crystallography. The mechanism of isomerization was also proposed.     

流动注射-结晶紫-磷钼杂多酸离子缔合体系光度法测定水中痕量正磷酸盐

在一定的酸度条件下,结晶紫与磷钼杂多酸离子缔合物的流动注射分光光度法可直接测定痕量磷.灵敏度高,重现性和选择性好.水中常见离子不干扰痕量磷的测定,工作曲线的线性范围为0～500μg·L~(-1)的磷,检出下限达1.0μg·L~(-1),以120h~(-1)采样频率,对各种天然水样进行测定,回收率为92.5%～105.0%,相对标准偏差为0.1%～6.7%.     

金在酸性硫脲溶液中的阳极溶解过程

采用循环伏安法、旋转金盘电极和库仑电解等方法研究了金在酸性硫脲(TU)溶液中的阳极溶解过程。提出了金的阳极溶解机构。认为表面的Au(TU)_(ads)~ 的“化学溶解”步骤是过程的控制步骤。由此解释了旋转金盘电极的极化曲线出现电流峰以及金的溶解速度出现极大的原因。     

Application of microemulsions in determination of chromium naphthenate in gasoline by flame atomic absorption spectroscopy

A new method using microemulsified samples is presented. It is for the determination of chromium naphthenate in gasoline by flame absorption spectroscopy. The method has the advantage of simplicity, speed and the use of aqueous standards for calibration instead of organic standards. Coexistent elements do not disturb the determination. Results obtained by this method were better than those obtained by other methods for the same samples.     

双核金属酞菁类化合物催化脱硫机理研究Ⅳ──中心金属离子对MPc－PcM催化活性的影响

实验研究结果表明双核金属酞菁类化合物ＭＰｃ－ＰｃＭ（Ｍ＝Ｖ、Ｃｒ、Ｍｎ、Ｆｅ、Ｃｏ、Ｎｉ、Ｃｕ）是催化Ｈ＿２Ｓ液相氧化反应的良好催化剂，且其催化活性顺序为Ｃｏ＞Ｎｉ＞Ｖ＞Ｆｅ＞Ｃｕ＞Ｃｒ＞Ｍｎ．采用量子化学理论计算方法（ＩＮＤＯ／Ｓ）分析了其前线分子轨道的构成特征，结果表明这几种ＭＰｃ－ＰｃＭ的ＬＵＭＯ轨道皆为有金属离子参与形成的π轨道，但ＨＯＭＯ轨道间的差异却很大．Ｍ＝Ｃｏ、Ｎｉ、Ｃｕ、Ｃｒ时，其ＨＯＭＯ为π轨道；而Ｍ＝Ｆｅ、Ｍｎ时，其ＨＯＭＯ却为σ轨道．正是在前线分子轨道的轨道类型、共轭程度及金属轨道贡献三方面因素的协同作用下，才导致ＭＰｃ－ＰｃＭ的催化活性顺序并非按中心金属离子价电子层ｄ电子数的递变而呈现出规律性的变化．     

二茂钛含氟有机酸衍生物的质谱研究

本文研究了二茂钛含氟长链有机酸衍生物(1～3)和具有环状结构的新型二茂钛全氟有机酸(4～7)的电子轰击质谱(EIMS)和负离子化学电离质谱(NICIMS)。在EI谱中出现弱的或不出现M~+,1～7均以CpTiF_2离子为基峰。高质量区的主要特征碎片离子有[M-·cp]~+、[M-R]~+(1～3)和氟重排离子。在低质量区出现一系列二茂钛及茂钛氟重排离子。 1、4～7的NICI(CH_4)质谱中,4、5出现强的M~-离子峰,1出现[M-1]-离子峰,有两个钛的环状结构化合物6和7出现双电荷M~=离子峰,而不出现M~-。     

Use of α‐diketones as visible photoinitiators for the photocrosslinking of waterborne latex paints

The efficiency of several α‐diketones as visible light photoinitiators for the crosslinking of waterborne latex dispersions in the presence of acrylic monomers was evaluated. Among the eight α‐diketones studied, camphorquinone allows the fastest curing speed, and the curing of the acrylic waterborne coating is not affected by the presence of oxygen. The properties of the sunlight‐cured volatile organic compound (VOC)‐free pigmented paints prepared from the waterborne latex are as good or better than the equivalent conventional paint containing VOCs. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 3171–3181, 2002     

Matrix Effects and Behaviors of Elements in Oxalic Acid Medium by Inductively Coupled Plasma Mass Spectrometry

Because of its high sensitivity, wide dynamic range and relative freedom from interferences, inductively coupled plasma mass spectrometry (ICP-MS) has been developed for the determination of trace and ultra-trace levels of elements in various fields1. Due…     

固相配位化学反应研究 L ⅩⅩⅢ.等温电导法研究醋酸锰和草酸的室温固相化学反应

本文利用等温电导法考察了醋酸锰和草酸的室温固相配位化学反应的制样方法对实验结果的影响，并获得了该反应的动力学参量。     

用计算模拟方法研究Al_3P_4O_(16)~(3-)计量比的二维层状磷酸铝中的有机胺模板能力

将快速 Monte Carlo方法与分子动力学方法相结合 ,研究了不同种类有机分子在 Al3P4 O3- 1 6 计量比的二维层状磷酸铝形成中的模板能力 .依据主 -客体之间非键相互作用能 (包括范德华能、氢键能和库仑能 ) ,可合理地解释已知实验现象 ,并能有效地预测出适于形成某一特定无机层结构的有机胺模板剂 .通过选择理论预测的有机胺分子作为模板剂 ,成功地合成了二维层状磷酸铝化合物 Al3P4 O1 6 · 1 .5 H3NC6 H1 0 NH3.