Modular Synthesis of Bipyridinium Oligomers and Corresponding Donor–Acceptor Oligorotaxanes with Crown Ethers
摘要:
Donor-acceptor [4]- and [6]rotaxanes have been prepared from bipyridinium (BIPY2+) oligomers and 1,5-dinaphtho[38]crown-10 (DN38C10) by a threading-followed-by-stoppering protocol employing click chemistry. An efficient, straightforward route to the BIPY2+ oligomers has been developed that requires little to no chromatographic purification. Unlike most donor-acceptor oligorotaxanes that have been reported to date, 100% of the recognition sites on the dumbbells are occupied by rings.
A Track-Based Molecular Synthesizer that Builds a Single-Sequence Oligomer through Iterative Carbon-Carbon Bond Formation
作者:Charlie T. McTernan、Guillaume De Bo、David A. Leigh
DOI:10.1016/j.chempr.2020.09.021
日期:2020.11
iteratively joining buildingblocks to form an oligomer of single sequence with a continuous backbone of carbon-carbon bonds. The rotaxane features a macrocycle bearing an aldehyde-terminated chain and an axle containing different phosphonium ylides separated by rigid spacers. Each ylide is large enough to block the passage of the macrocycle, trapping the ring between the stopper at the terminus of
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。
A Neutral Naphthalene Diimide [2]Rotaxane
作者:Henri-Pierre Jacquot de Rouville、Julien Iehl、Carson J. Bruns、Psaras L. McGrier、Marco Frasconi、Amy A. Sarjeant、J. Fraser Stoddart
DOI:10.1021/ol3022963
日期:2012.10.19
A neutral donor-acceptor [2]rotaxane, which has been synthesized using click chemistry, has had its solid-state structure and superstructure elucidated by X-ray crystallography. Both dynamic H-1 NMR spectroscopy and electrochemical investigations have been employed in an attempt to shed light on both geometrical reorganization and redox-switching processes that are occurring or can be induced within the [2]rotaxane.