‘Click’ functionalised polymer resins: a new approach to the synthesis of surface attached bipyridinium and naphthalene diimide [2]rotaxanes
作者:Hannah Wilson、Sean Byrne、Nick Bampos、Kathleen M. Mullen
DOI:10.1039/c3ob27273g
日期:——
Herein we describe the design and synthesis of a series of solid-tethered [2]rotaxanes utilising crown ether-naphthalene diimide or crown ether-bipyridinium host guest interactions. TentaGel polystyrene resins were initially modified in a two-stage procedure to azide functionalised beads before the target supramolecular architectures were attached using a copper catalysed âclickâ procedure. The final assembly was examined using IR spectroscopy and gel-phase 1H High Resolution Magic Angle Spinning (HR MAS) NMR spectroscopy. The HR MAS technique enabled a direct comparison between the solid-tethered architectures and the synthesis and characterisation of analogous solution-based [2]rotaxanes to be made.
Dynamic covalent synthesis of [2]- and [3]rotaxanes both in solution and on solid supports
作者:Rafael Da Silva Rodrigues、David L. Marshall、John C. McMurtrie、Kathleen M. Mullen
DOI:10.1039/d0nj02137g
日期:——
reported. Our work demonstrates that disulfide exchange can be used to synthesise neutral naphthalene diimide containing rotaxanes. Detailed HPLC analysis enabled deconvolution of a complex equilibrium between 6 disulfide species in solution. Analogous experiments investigating dynamic covalent attachment of rotaxanes to TentaGel™ polymer resins usingdisulfide chemistry resulted in significantly increased
Understanding coordination equilibria in solution and gel-phase [2]rotaxanes
作者:Sean W. Hewson、Kathleen M. Mullen
DOI:10.1039/c8ob02304b
日期:——
This paper describes the use of the copper(I)-catalysed azide–alkynecycloaddition reaction in an active metal template methodology for the synthesis of [2]rotaxanes both in solution and on polymer resins. The use of TentaGel resin beads has allowed the rotaxane functionalised solid supports to be characterized by 1H HR MAS NMR. Whereas previous research in the assembly of interlocked architectures on
本文介绍了在活性金属模板方法中铜(I)催化的叠氮化物-炔烃环加成反应在溶液中和在聚合物树脂上合成[2]轮烷的用途。使用TentaGel树脂珠粒可以使轮烷官能化的固体载体的特征为1H HR MAS NMR。尽管先前对表面上互锁结构的组装的研究由于并发附着大量非互锁副产物而变得复杂,但在此示例中,超过80%的功能化是所需的互锁轮烷。锌金属卟啉的在[2]轮烷线程的结构包含允许的大环的位置是“切换”在加入竞争的基础上,除去金属或的溶剂适当选择的。研究了机械键对金属卟啉-大环化合物配位平衡的拟合作作用,并计算了该[2]轮烷的相关有效摩尔浓度为120 mM。
New approaches to the synthesis of strapped porphyrin containing bipyridinium [2]rotaxanes
作者:Victoria Raymont、Hannah Wilson、Michael Pfrunder、John C. McMurtrie、Kathleen M. Mullen
DOI:10.1039/c2nj40762k
日期:——
describe new approaches towards the synthesis of related rotaxanes. Previous efforts in this domain had been hampered by the limited range of chemical reactions that are compatible with these motifs, however the use of a “click” methodology, together with a better understanding of the size of these strapped porphyrin macrocycles, resulted in the synthesis of a bipyridinium porphyrin [2]rotaxane in modest
Redox-Controlled Selective Docking in a [2]Catenane Host
作者:Gokhan Barin、Marco Frasconi、Scott M. Dyar、Julien Iehl、Onur Buyukcakir、Amy A. Sarjeant、Raanan Carmieli、Ali Coskun、Michael R. Wasielewski、J. Fraser Stoddart
DOI:10.1021/ja3125004
日期:2013.2.20
The docking by neutral and charged guests selectively in two geometrically different binding pockets in a dynamic [2]catenane host is demonstrated in the solid state by manipulating its redox chemistry. The change in redox properties, not only alters the affinity of the host toward neutral and charged guests, but it also induces a profound change in the geometry of the host to accommodate them. X-ray crystallography, performed on the two different 1:1 complexes, demonstrates unambiguously the fact that the [2]catenane host provides a uniquely different binding pocket wherein a methyl viologen dication is stabilized by interacting with a bipyridinium radical cation, despite the presence of Coulombic repulsions.