Quadruple Switching of Pleated Foldamers of Tetrathiafulvalene-Bipyridinium Alternating Dynamic Covalent Polymers
作者:Lan Chen、Hui Wang、Dan-Wei Zhang、Yaming Zhou、Zhan-Ting Li
DOI:10.1002/anie.201410757
日期:2015.3.23
Two dynamic covalent polymers P1 and P2 were prepared by alternately linking electron‐rich tetrathiafulvalene (TTF) and electron‐deficient bipyridinium (BIPY2+) through hydrazone bonds. In acetonitrile, the polymers were induced by intramolecular donor–acceptor interactions to form pleated foldamers, which unfolded upon oxidation of the TTF units to the radical cation TTF.+. Reduction of the BIPY2+
通过dynamic键交替连接富电子的四硫富瓦烯(TTF)和缺电子的联吡啶鎓(BIPY 2+),制备了两种动态共价聚合物P1和P2。在乙腈中,聚合物是通过分子内供体-受体相互作用诱导形成的褶状折叠子,折叠的折叠子在TTF单元氧化为自由基阳离子TTF 。+时会展开。BIPY 2+单元还原为BIPY 。+导致形成了另一种打褶的二级结构,该结构通过BIPY 。+单元的分子内二聚作用得以稳定。双自由基双环芳基环双(百草枯-对苯撑)(CBPQT2(。+))可通过包含聚合物的BIPY 。+单元来进一步迫使折叠结构展开。环烷和聚合物的BIPY 。+单元氧化成BIPY 2+后,第一折叠状态得以再生。通过UV / Vis光谱实验证实了四种构象状态之间的切换或转化。