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| 1 | A new cryptand/paraquat [2]pseudorotaxane显示文摘A new cryptand/paraquat [2]pseudorotaxane and its crown ether analog were synthesized and characterized by proton NMR, mass spectrometry, and single crystal X-ray analysis. The Job plots based on proton NMR data demonstrated that both the complex between cryptand 1 and paraquat derivative 2a and the complex between bis(p-phenylene)-34-crown-10 (3) and paraquat derivative 2b have 1:1 stoichiometry in solution. The apparent association constants (Ka,exp) of 1·2a and 3·2b calculated for 1:1 complexes were 1.4 (±0.2) × 104 and 4.7 (± 0.5) × 102 M-1, respectively. X-ray analysis showed that 1·2a is stabilized by ten hydrogen bonds and face-to-face π-stacking interactions in the solid state, while 3·2b is stabilized by four hydrogen bonds and face-to-face π-stacking interactions. As well as in the X-ray structure of 1·2c, a water molecule acts as a hydrogen bridge between the β-pyridinium protons of 2a and the ether oxygen atoms of 1 in 1·2a. The successful preparation of 1·2a demonstrated that the tert-butyl group is not big enough to be a stopper for rotaxanes based on 1. | ZAKHAROV Lev N. SLEBODNICK Carla RHEINGOLD Arnold L. GIBSON Harry W. | 2010 | Science China Chemistry2010，53，4： | 0 |
| 2 | 基于环蕃类分子的铁氰化钾电化学存储和释放显示文摘通过利用合成的环蕃类化合物1与单壁碳纳米管(SWNTs)间的π-π共轭相互作用,将化合物1固定在SWNTs的表面,制备了1-SWNT修饰电极.利用化合物1氧化态和还原态与铁氰化钾分子之间不同强度的主客体相互作用,实现了铁氰化钾分子在1-SWNT修饰电极表面的电化学可控吸附和解吸.循环伏安和XPS实验结果表明,在本研究采用的实验条件下,铁氰化钾分子在电极表面20s内即可达到吸附平衡;当电极在0.70V下极化1000s后,大多数吸附的铁氰化钾可从电极表面解吸.基于此,制备了铁氰化钾的可控存储和释放的电化学器件,该器件不但可以重复进行铁氰化钾分子的存储和释放,而且多次重复操作表现出较好的稳定性和重现性.本研究在发展具有特殊用途的电化学纳米器件,例如分子搬运器、电化学开关等研究中具有重要意义. | 闫捷 于萍 程翰俊 张德清 毛兰群 | 2011 | 中国科学:化学2011，41，8： | 0 |
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