The synthesis and catalytic activity of poly(bis(imino)pyridyl) iron(II) metallodendrimer

The first and second generation carbosilane dendrimers with silicon hydride terminated were synthesized, and then reacted with bis(imino)pyridyl containing allyl [4-CH2==CHCH2-2,6-(Pr2C6H3N)-Pr-i==CMe(C5H3N)MeC==N(2,6-'Pr2C6H3)], in the presence of H2PtCl6 as a hydrosilylation catalyst, to afford the first and second generation carbosilane supported ligands. Complexation reactions with FeCl(2)(.)4H(2)O give rise to iron-containing carbosilane dendrimers with FeCl2 moieties bound on the periphery. The metallodendrimers were used as catalyst precursors, activated with modified methylaluminoxane, for the polymerization of ethylene. In the case of low Al/Fe molar ratio, the metallodendrimers display much higher catalytic activity towards ethylene polymerization and produce much higher molecule weight polyethylenes than the corresponding single-nuclear complex under the same conditions.

各种极谱法研究液/液界面电化学

本文用简单的方法把国产MEC-12A型多功能微机电化学分析仪,JP-M1脉冲极谱仪和Metrohm E506型极谱仪(瑞士)与四电极恒电位仪相联,使原两电极或三电极系统改为四电极系统,建立了一系列液/液(L/L)界面电化学研究的实验方法,而且对L/L界面的常规脉冲法,微分脉冲法和交流伏安法的性能进行了研究。实验结果表明各类经典电化学研究金属/电解质(M/L)方法也可用于研究L/L界面电化学,且得到较好的效果。改装后的微分脉冲法可测5×10~(-7)mol/L三碘季胺酚。