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【威尼斯人手机版官网】通往高能之路:稠环高能量密度材料

编辑: 研究生院 发布日期: 2018-09-03 浏览量:

  讲座题目:通往高能之路:稠环高能量密度材料

                            FUSED RINGS LEAD THE WA Y TO MORE ENERGY IN SMALLER PACKAGES

  主 讲 人:Jean'ne M Shreeve

         爱达荷大学教授(曾先后担任化学系主任、副校长)、曾任美国国家科学奖章评审委员会主席、美国化学会Garvan-Olin奖章和“杰出教授”获得者

  时   间:2018年9月12日 9:30

  地   点:中关村校区 研究生教学楼101报告厅

  主办单位:研究生院、材料学院

  报名方式:扫描下方二维码

 【主讲人简介】

 

       Shreeve教授出生于美国蒙大拿州,华盛顿大学无机化学博士,剑桥大学博士后。1961年起在爱达荷大学工作,先后担任过化学系主任和副校长。2003-2007 间担任美国国家科学奖章评审委员会主席。先后被授予美国化学会Garvan-Olin奖章(全美每年仅授予一人)和“杰出教授”(Distinguised Professor)。她的研究领域主要包括含能材料,含能离子液体,氟化学,目前共发表论文610余篇,其中J. Am. Chem. Soc.和Angew. Chem. Int. Ed. 等国际顶级期刊超过了70篇,H因子为65。Shreeve教授是国际上高能材料和氟化学领域的顶尖科学家,近年来课题组有5位青年学者入选中组部"千人计划"青年项目。

   Prof. Jean’ne M. Shreeve is a Montana native and received a Ph.D. in inorganic chemistry at the University of Washington, Seattle. She has been at the University of Idaho since 1961 where she served as chemistry department head and vice president for research and graduate studies. In 2011, Shreeve was named a University Distinguished Professor. Her research interests include the design, syntheses, characterization, and reactions of energetic materials, fluorine-containing compounds, and energetic ionic liquids published in 610 papers in refereed journals.

【讲座摘要】

       具有共轭平面结构的稠环可以有效增加化合物的密度和分子稳定性,富氮稠环具有良好的热稳定性和低的感度,是设计含能化合物的重要骨架。报告将主要介绍稠环类高能量密度材料的设计,合成及其性能研究。

   A planar conjugated structure which contains fused rings can increase the density and molecular stability of compounds by electronic delocalization.  Fused nitrogen-rich heterocycles with coplanar molecular structures which show high thermal stability and low sensitivity toward destructive stimuli are very important structural designs.  In reaching for systems with such improved properties, several fused ring systems have been synthesized, and properties and structures determined.  For example, compared with RDX (1,3,5-trinitro-1,3,5-triazinane) having a distorted chair conformation, a polynitro-substituted dipyrazolo-1,3,5-triazinane is nearly planar with enhanced density and thermal stability; or a 4,4’,5,5’-tetrnitro-2,2’-diamino-3,3’-bipyrazole with pyrazole rings at 49.1? compared with the planar 5/6/5 fused azo ring, tetranitrodipyrazolo-1,2,3,4-tetrazine with outstanding properties.  Nitrogen rich heterocyclic compounds offer promising potential backbones for constructing various high energy-density compounds. Now selective diazotization of 3,5-diamino-4-nitropyrazole using tert-butyl nitrite followed by treatment with the sodium salt of nitroacetonitrile gives access to amino and nitro groups surrounding a fused pyrazolo-triazine ring. Interestingly, it has a remarkable thermal decomposition temperature of 355 oC, a high density of 1.90 g cm-3 and low impact and friction sensitivities. The future of energetic materials is bright with the design of each molecule and its synthesis limited only by the hands and the head of the dedicated synthesis chemist.