YAG∶Nd中Pr,Sm,Dy杂质对其光谱的影响

采用溶胶 -凝胶法合成了YAG∶Nd ,Re(Re =Pr,Sm ,Dy)系列化合物 ,研究了它们的光谱性质 .结果表明 :Pr3 + ,Sm3 + ,Dy3 + 对YAG基质中Nd3 + 的发光具有猝灭作用 ,属于有害杂质 ,在激光晶体原料中必须除去     

Decomposition of Transformer Oil Under Ultrasonic Irradiation During Degassing Process

In the degassing process of transformer oil with ultrasonic waves ,decompostition of the oil was observed.Light hydrocarbons,including methane,ethane,ethylene ,aceylene,propane etc,were found to be released continuously from the oil into headspace within a closed vial placed in an ultrasonic field ,The gases came from decomposition of hydrocarbon molecules under cavitation effect.     

2，3—二氰基—2，3—二（p—X苯基）丁二酸二乙酯的分子构型和取代基电子效应对613 NMR谱的影响

测定了meso-和dl-2,3－二氰基－2，3－二（p-X苯基）丁二酸二乙酯（X＝OCH3，CH3，H，Cl,NO2)的^13C NMR谱。结果表明，，中心碳－碳键两端相连基团的各碳原子的化学位移值相同，与dl-异构体相比，所有相应meso-异构体的乙氧羰基^13C NMR吸附峰均处于高场，苯环对位取代基的Hammett基团常数σ与氰基碳原子和乙氧羰基中的羰基碳及次甲基碳的化学位移间线性相关，而且meso-异构体比dl-异构体有更好的线性关系。     

Transient Spectroscopic Properties of [60] Fullerene—Containing Cyclic Sulphoxide

The properties of the triplet excited state of [60] fullerene-containing cyclic sulphoxide have been investigated by time-resolved absorption spectroscopy. Transient absorption bands of [60] fullerene-containing cyclic sulphoxide showed two decay-components, which wrer attributed to triplet excited states of different spin multiplicity. The properties of photoexcited states of [60] fullerene-containing cyclic sulphoxide are also reported.     

Activation of Carbon Dioxide and Synthesis of Propylene Carbonate

Cycloaddition of carbon dioxdie and propylene oxide to propylene carbonate catalyzed by tetra-tert-butyl metal phthalocyanine in the presence of tributylamine(TBA) shows higher yield than catalyzed by unsubstituted metal phthalocyanine.Comparing different catalysts of diverse metals,(t-Bu)4PcMg is more active than (t-Bu)PcFe ,But(t-Bu)4PcCo and (t-Bu)4PcNi only have low catalytic activities towards the reaction.Moreover,the yield will increase as the temperature increases.