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学科主题: 物理化学
题名: Alkali and alkaline-earth metal borohydride hydrazinates: synthesis, structures and dehydrogenation
作者: He, Teng1;  Wu, Hui2, 3;  Chen, Juner1;  Zhou, Wei2, 3;  Wu, Guotao1;  Xiong, Zhitao1;  Zhang, Tao1;  Chen, Ping1
通讯作者: 陈萍
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2013
DOI: 10.1039/c3cp51473k
卷: 15, 期:25, 页:10487-10493
收录类别: SCI
合作性质: 
文章类型: Article
部门归属: DNL19,15
项目归属: DNL1901,1501
产权排名: 待补充
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
资助者: 1,1
研究领域[WOS]: Chemistry ;  Physics
英文摘要: Four new borohydride hydrazinates, including NaBH4 center dot NH2NH2, LiBH4 center dot 1/2NH(2)NH(2), LiBH4 center dot 1/3NH(2)NH(2) and Mg(BH4)(2)center dot 3NH(2)NH(2), were synthesized. NaBH4 center dot NH2NH2 and Mg(BH4)(2)center dot 3NH(2)NH(2) possess monoclinic and trigonal structures, respectively, while LiBH4 center dot 1/2NH(2)NH(2) and LiBH4 center dot 1/3NH(2)NH(2) exhibit orthorhombic and monoclinic structures. The effects of composition on the dehydrogenation of hydrazinates were investigated. It is demonstrated that cations with high Pauling electronegativity hold hydrazine strongly in the vicinity of borohydride and result in direct dehydrogenation at elevated temperatures. Specifically, Mg(BH4)(2) hydrazinates can directly generate hydrogen upon heating it under a flow of Ar; on the other hand, the Li and Na counterparts lost part or all of the hydrazine components under the same condition. In addition, reducing NH2NH2 content in the complexes leads to improved dehydrogenation properties. Mechanistic investigation of Mg(BH4)(2) hydrazinates using isotopic labelling indicates that hydrogen desorption is via homogeneous dissociation of N-N bond of NH2NH2 followed by the establishment of B-N bond and combination of H-delta+ (N) and H delta- (B).
关键词[WOS]: CHEMICAL HYDROGEN STORAGE ;  HIGH-EXTENT DEHYDROGENATION ;  MAGNESIUM BOROHYDRIDE ;  LITHIUM BOROHYDRIDE ;  CRYSTAL-STRUCTURE ;  ROOM-TEMPERATURE ;  COMPLEX HYDRIDES ;  DECOMPOSITION ;  LIBH4 ;  AMIDOBORANES
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000319943200053
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/119094
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian, Peoples R China
2.NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA
3.Univ Maryland, Dept Mat Sci & Engn, College Pk, MD 20742 USA

Recommended Citation:
He, Teng,Wu, Hui,Chen, Juner,et al. Alkali and alkaline-earth metal borohydride hydrazinates: synthesis, structures and dehydrogenation[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2013,15(25):10487-10493.
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