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A rotaxane (from Latin rota ' wheel ', and axis ' axle ') is a mechanically interlocked molecular architecture consisting of a dumbbell -shaped molecule which is threaded through a macrocycle (see graphical representation). The two components of a rotaxane are kinetically trapped since the ends of the dumbbell (often called stoppers) are larger ...
Aug 22, 2020 · Similarly to the capping method, snapping involves the pre-assembly of semi[2]rotaxane and covalent bonding with a stopper (Fig. 1 (ii)). As the macrocycle component is pre-synthesized in both methods, capping and snapping are especially suitable for the synthesis of [2]rotaxanes based on cyclodextrins, cucurbit[n]urils, and other macrocycles whose syntheses and modifications are not ...
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Rotaxanes. By Katrina Krämer 7 June 2017. A group of compounds that resemble machine parts could pave the way for molecular robots. Ben Valsler. This week, Katrina Krämer introduces the compounds ...
Apr 2, 2020 · The Cover Feature shows a cartoon representation of helic[6]arene-based [2]rotaxane which performs as a triply operable molecular switch. The states of helic[6]arene on different sites (protonated tertiary ammonium salt and hexamethylene chain) are reversibly switched by the addition and removal of fluoride ions (TBAF/NaBArF), protonation and deprotonation of tertiary amine (HBArF/DBU), and ...
The rotaxane shows more redshifted absorption and emission than the thread (as a reference) when the solvent is changed from nonpolar (e.g., toluene) to more polar (e.g., DMSO). Scheme 31 . Chemical structure of thread and rotaxane and the solvent-driven equilibrium shift of two translational conformers, pery and ni .
Mar 3, 2018 · This Minireview presents illustrative examples of chiral [2]catenanes and [2]rotaxanes, and discusses where these molecules have been used in chemical applications such as chiral host–guest recognition and asymmetric catalysis. Keywords: catalysis, catenanes, chirality, host–guest recognition, rotaxanes. 1.
Apr 7, 2022 · Rotaxanes are an emerging class of molecules composed of two building blocks: macrocycles and threads. Rotaxanes, and their pseudorotaxane and polyrotaxane relatives, serve as prototypes for molecular-level switches and machines and as components in materials like elastic polymers and 3D printing inks. The rigidity and flexibility of these molecules is a characteristic feature of their design ...
