A liquid-crystalline bistable [2]Rotaxane
A liquid-crystalline bistable [2]Rotaxane
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DOI：
10.1002/anie.200700305
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发表时间：
2007-01-01
影响因子：
16.6
通讯作者：
Stoddart, J. Fraser
中科院分区：
文献类型：
--
作者：
Aprahamian, Ivan;Yasuda, Takuma;Stoddart, J. Fraser
液晶是分子的有序凝聚态，可用作动态功能材料，在信息传输、传感和催化以及电光显示中发挥重要作用。[1]液晶的有序化是一种合作现象，对少量添加的掺杂剂分子高度敏感。刺激响应性双相掺杂剂已被开发作为1）控制本体液晶（LC）性质的手段和2）将分子运动放大为机械功的方式。[2]尽管光响应和热响应系统具有潜在的有用特性，但氧化还原响应液晶是相对未开发的材料。[3]正是由于这个原因，我们决定尝试在LC相中排列电化学可切换的双[2]轮烷[4]。[5]基于环双（百草枯-苯撑）[6]（CBPQT 4+）/π-供体基序的双稳态[2]轮烷[4]已成为制造分子电子器件的主要候选者。[7]这种可转换的[2]轮烷中的双稳态依赖于CBPQT 4+环与四硫富瓦烯（TTF）单元的相互作用比与较少的富π电子的1，5-二氧基萘（DNP）单元的相互作用强得多的能力，这两个识别位点通常并入这种可转换的[2]轮烷中。
Liquid crystals are ordered condensed states of molecules that can be used as dynamic functional materials which play significant roles in information transport, sensing, and catalysis, as well as in electrooptical displays.[1] The ordering of liquid crystals is a cooperative phenomenon that is highly sensitive to small amounts of added dopant molecules. Stimuli-responsive bistable dopants have been exploited both as 1) a means of controlling bulk liquid-crystalline (LC) properties and as 2) a way of amplifying molecular motion into mechanical work.[2] Despite the potentially useful characteristics of light-and heat-responsive systems, redoxresponsive bistable liquid crystals are relatively unexplored materials.[3] It was for this reason that we decided to try and align electrochemically switchable, bistable [2] rotaxanes [4] within LC phases.[5]Bistable [2] rotaxanes [4] based on the cyclobis (paraquat-pphenylene)[6](CBPQT4+)/π-donor motif have emerged as leading candidates for the fabrication of molecular electronic devices.[7] The bistability in such switchable [2] rotaxanes relies on the ability of the CBPQT4+ ring to interact much more strongly with a tetrathiafulvalene (TTF) unit than with the less π-electron rich 1, 5-dioxynaphthalene (DNP) unit, the two recognition sites commonly incorporated into such