文献类型：期刊文献

英文题名：Coordination-assembly for quantitative construction of bis-branched molecular shuttles

作者：Zhu, Liangliang;Lu, Meiqun;Qu, Dahui;Wang, Qiaochun;Tian, He[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2011

卷号：9

期号：11

起止页码：4226

外文期刊名：ORGANIC & BIOMOLECULAR CHEMISTRY

收录：;EI(收录号：20112114004174);WOS:【SCI-EXPANDED(收录号:WOS:000290735300034)】；

基金：This work is financially supported by National Basic Research 973 Program, NSFC/China (20972053, 20902024). The authors are grateful for assistance from Dr D. Zhang, Dr X. Ma, Mr. Q. W. Zhang, Mr. C. Gao.

语种：英文

外文关键词：Ethylene - Molecular electronics - Platinum compounds - Coordination reactions - Amines - Nitrates - Palladium compounds - Solutions - Axles

摘要：The development and utilization of a new way to build molecular devices is of importance. To build a novel topology of interlocked molecular systems with a controllable mechanical motion, an axle-like compound comprising azobenzene and alkoxy isophthalate moieties was synthesized first. It would form a switchable hemi-rotaxane structure with alpha-cyclodextrin (alpha-CD) ring encapsulated in aqueous solution. Next, the hemi-rotaxane was reacted with ethylene diamine palladium nitrate (Pd(en)(NO3)(2)) and ethylene diamine platinum nitrate (Pt(en)(NO3)(2)), respectively, to quantitatively form two bis-branched molecular shuttles in situ. The bis-coordinated Pd(II) complex was formed quickly at room temperature, whereas the bis-coordinated Pt(II) one was effectively treated at 333 K but more stable than the former. In this case, transformation of ring shuttling direction could take place in the stable bis-branched Pt(II) complex. The steric effect of the co-stopper, namely the Pt(II) metal center, made the alpha-CD ring dynamically shuttle inwards to the alkoxy isophthalate station with the azobenzene's photoisomerization, rather than dethreading from the axle.