Theoretical study on the structures and isomerization of Silylenoid (RNCH=CHNR) SiLiF (R=H and t-Bu)
Journal Title: Science Paper Online - Year 2008, Vol 3, Issue 6
Abstract
The structures and isomerization of N-heterocyclic silylenoid (R=H and t-Bu) were studied by density functional theory (DFT) at B3LYP/6-31G(d) level for the first time. For both two silylenoids, the p-complex structure with a four-membered ring is the most stable form and would be the experimentally detectable one. The three-membered ring structure, σ-complex, and the“classical”tetrahedron structures are active intermediates when silylene (RNCH=CHNR)Si approach to LiF molecule. The stability, reactivity, existence and tert-butyl substituent effects of various equilibrium structures were discussed.
Authors and Affiliations
Ju XIE, Dacheng FENG, Yaxing YIN
小檗碱对Aβ25-35诱导大鼠PC12细胞<br /> 损伤的保护作用<br />
目的:探索小檗碱对β-淀粉样蛋白25-35(Aβ25-35)诱导肾上腺嗜铬细胞瘤(PC12)细胞损伤的作用。方法:采用25 μM Aβ25-35处理PC12细胞36 h建立细胞损伤模型,应用细胞增殖抑制实验(MTT)评价细胞存活率,并检测细胞谷胱甘肽过氧化物酶(...
Surface modification of Mg73Zn26Y quasicrystal alloy using a high current pulsed electron beam treatment
Mg73Zn26Y quasicrystal alloy was treated using the high current pulsed electron beam (HCPEB). Its surface microstructure features along with hardness and wear resistance were investigated by X-ray diffraction, scanning...
水下高速运动体纵向运动建模及稳定控制
为保证水下高速运动体在水中能稳定地高速运动,使用分叉法分析运动体的运动规律并确定控制律。对运动体受力和超空泡特性进行分析,建立了水下高速运动体纵向运动的动力学模型,利用Matlab/R2007asimulink仿真平台设计了水下高速运动体模...
相对论平均场理论对Zr同位素基态性质的研究
在相对论平均场理论框架下,采用类壳模型方法处理对关联对Zr同位素的基态性质进行研究。理论计算给出的结合能,单双中子分离能与实验数据一致。单中子分离能的奇偶staggering现象被清晰地再现。
Key technology and application for super-high speed grinding machining
Super-high grinding machining is a widely employed finishing process to achieve close tolerances and good dimensional accuracy as well as the surface integrity for different materials such as metals,ceramics,glass,roc...