the introduction of pyridine bisamine terdentate ligands in the structure of a pirouetting copper rotaxane. Rotaxane2[PF6] constitutes the first example of the incorporation of imine‐based dynamic covalent chemistry in the synthesis of switchable copper‐complexed interlocked systems. In this rotaxane, the substitution of the classical terpyridine terdentate unit by a pyridine bisamine moiety has led
Fast shuttling motions in solution have been observed by cyclic voltammetry in a CuI/II-based [2] rotaxane. In the reported system, the different coordination preferences of both copper oxidation states are exploited to promote the electrochemically-triggered gliding of the ring from a tetra to a pentacoordinated site and vice versa. The thread of this rotaxane consists of a tridentate 2,2′:6′,2′′-terpyridine
通过循环伏安法在基于Cu I / II的[2]轮烷中观察到了溶液中的快速穿梭运动。在报道的系统中,利用了两种铜氧化态的不同配位偏好,以促进环的电化学触发滑行从四到五配位,反之亦然。该轮烷的线由三齿的2,2':6',2''-吡啶吡啶螯合单元组成,该螯合单元通过其5-位直接键合到双齿1,10-菲咯啉单元的3-位。这种分布将两个配位点之间的距离减至最小,并减轻了四面体周围环境的拥堵。已经证明这两个因素极大地增加了切换过程的动力学。另外,在不同溶剂混合物中进行的电化学实验证明了溶剂对穿梭机理的影响。
Transition-metal template synthesis of a rotaxane incorporating two different coordinating units in its thread
作者:Pabio Gaviña、Jean-Pierre Sauvage
DOI:10.1016/s0040-4039(97)00678-3
日期:1997.5
A [2]rotaxane consisting of a molecular string threaded into a coordinating ring by means of the template effect of copper (I) has been synthesized. The acyclic fragment incorporates two different chelating sites (bidentate and terdentate ligands) whereas the macrocycle bears a bidentate chelate. Two bulky groups have been covalently attached at the ends of the thread. (C) 1997 Elsevier Science Ltd.