Interaction of gas phase atomic hydrogen with Pt(111):Direct evidence for the formation of bulk hydrogen species

Employing hot tungsten filament to thermal dissociate molecular hydrogen,we generated gas phase atomic hydrogen under ultra-high vacuum(UHV)conditions and investigated its interaction with Pt(111) surface.Thermal desorption spectroscopy(TDS)results demonstrate that adsorption of molecular hy- drogen on Pt(111)forms surface Had species whereas adsorption of atomic hydrogen forms not only surface Had species but also bulk Had species.Bulk Had species is more thermal-unstable than surface Had species on Pt(111),suggesting that bulk Had species is more energetic.This kind of weakly- adsorbed bulk Had species might be the active hydrogen species in the Pt-catalyzed hydrogenation reactions.     

微波辐射法合成α-萘甲醚的研究

用微波辐射法合成α－萘甲醚，考察了不同条件对产率的影响，此法反应时间短，产率可达75％。     

A new ruthenium-catalyzed hydrogen-transfer reaction: transformation of 3-benzyl but-1-ynyl ethers into 1,3-dienes and benzaldehyde

We report a ruthenium-catalyzed reaction for various 3-benzyl but-1-ynyl ethers with suitable functionalities. Treatment of these substrates with TpRu(PPh3)(CH3CN)2PF6 (8.0 mol %) catalyst in 1,2-dichloroethane (80 degrees C, 12 h) afforded functionalized 1,3-dienes and benzyl aldehyde in good yields. This process is considered to be a tandem dealkoxylation and transfer hydrogenation. Deuterium-labeling experiments reveal that the migration of different hydrogen atoms proceeds regiospecifically. A plausible mechanism is proposed on the basis of the results of isotope experiment.     

基于溶胶-凝胶技术的丁氯喘电极

报导了一种以硅钨酸为活性物质 ,用溶胶 凝胶技术制做的新型丁氯喘电极。电极有良好的能斯特响应。斜率为 5 5mV以上 ,线性范围为 1 .0× 1 0 -1～5 .0× 1 0 -5mol L ,检测下限为 2 .0× 1 0 -5mol L ,适宜的pH为 4.2～ 8.7。     

Indium (III) Tribromide : An Excellent Catalyst for Biginelli Reaction

A highly efficient catalyst indium (III) tribromide is used to synthesize 5-alkoxy- carbonyl-4-hydrocarbyl-3,4-dihydropyrimidin-2(1H)-ones by a three-component coupling of β-keto ester, aldehydes and urea through improved Biginelli reaction.     

Studies on the Phase Properties of Winsor Ⅰ-Ⅲ Type Microemulsions with Dielectric Relaxation Spectroscopy

The dielectric relaxation spectroscopy （DRS） of Winsor I -Ⅲ microemulsions for nonionic surfactant octyl polyglucoside CsG1.46/1-butanol/cyclohexanedwater system was studied. The experiment shows that the permittivity decreases with the increase in the frequency and clear dielectric relaxation phenomena were observed. Permittivity obviously decreases with the change of the microstructure of the microemulsion, W/O, B.C. and O/W can be distinguished by the permittivity.     

C_（60）化学修饰的PNVC材料的UV－VIS谱研究

本实验采用金属有机化学方法成功地将富勒烯分子引入到ＰＮＶＣ侧链形成ＣＢＰ（ＣｈａｒｍＢｒａｃｅｌｅｔＰｏｌｙｍｅｒ）型共聚功能材料，研究了其ＵＶ－ＶＩｓ谱行为。结果表明，Ｃ_（６０）或Ｃ_（６０）／Ｃ_（７０）混合物化学修饰的产物其紫外可见谱明显向长波方向移动，谱峰范围由２８０ｎｍ扩展至８７０ｎｍ。Ｃ_（６０）含量增加，红移程度增大，在可见区域的吸收程度亦增加。产物主要存在５个特征峰，分别位于２１５ｎｍ、２６５ｎｍ、２９８ｎｍ、３３５ｎｍ、３４５ｎｍ处，其中２１５ｎｍ峰为Ｃ_（６０）仅存的特征峰。最后讨论了不同合成条件与产物硝化处理对其ＵＶ－ＶＩＳ谱行为的影响。     

Synthesis and Magnetic Properties of Binuclear Mn（Ⅱ）Complexes with Alkoxide Bridge

ＳｙｎｔｈｅｓｉｓａｎｄＭａｇｎｅｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＢｉｎｕｃｌｅａｒＭｎ（Ⅱ）ＣｏｍｐｌｅｘｅｓｗｉｔｈＡｌｋｏｘｉｄｅＢｒｉｄｇｅＹａｎＳｈｉ－ｐｉｎｇ；ＦａｎＢｏ；ＬｉａｏＤａｉ－ｚｈｅｎｇ；ＪｉａｎｇＺｏｎｇ－ｈｕｉａｎｄＷａｎｇ...     

新试剂3,5-二溴-4-偶氮对二甲苯胺苯基荧光酮与钨配合物的分光光度法研究

新试剂３，５－二溴－４－偶氮对二甲苯胺苯基荧光酮与钨配合物的分光光度法研究＊颜克美黄应平（湖北三峡学院化学系宜昌４４３０００）关键词３，５－二溴－４－偶氮对二甲苯胺苯基荧光酮钨分光光度法中图分类号Ｏ６５７．３２在表面活性剂存在下，苯基荧光酮类试剂测定...     

堇青石窑具多晶结构与性能研究

利用X-射线衍射分析和电子显微镜分析的结果，确定堇青石窑具的多晶结构和各晶相的含量；结合窑具性能的研究，确定堇青石窑具具有优良性能的适宜配方。