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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).
Jun 10, 2019 · 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 ...
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Oct 20, 2017 · The researchers have also demonstrated that a switchable rotaxane may asymmetrically catalyze reactions in a controlled fashion (Figure 24). 52 Rotaxane (R)-46 + PF 6 − includes two stations: in acidic conditions, the central secondary amine of the axle is protonated and the crown ether macrocycle resides over the resulting ammonium group ...
- Nicholas Henley Evans
- 2018
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 ...
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 ...
Jan 12, 2021 · The supramolecular structure called “rotaxane” is obtained by penetrating the cavity of a cyclic molecule with a linear molecule whose ends are capped by a molecule ... Full size image. Fig. 2.
Jun 3, 2019 · A particularly impressive example of a rotaxane-based molecular machine was that of a light-driven motion associated to reversible electron transfer described in 2001. 10 In the same direction, Balzani, Credi, Stoddart and their teams reported an autonomous linear motor activated by using solar-light excitation of a ruthenium(II) complex ...
