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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 ...
Mar 3, 2018 · This has been demonstrated in a rotaxane prepared by Leigh and co‐workers (Figure 17).44 At room temperature, the macrocycle of the achiral [2]rotaxane 27 can move between the two fumaramide functional groups on a symmetrical axle. However, if the alcohol at the centre of the axle is benzoylated, the macrocycle becomes trapped at one end of ...
Squaraine dye. Squaraine dyes are a class of organic dyes showing intense fluorescence, typically in the red and near infrared region (absorption maxima are found between 630 and 670 nm and their emission maxima are between 650–700 nm). They are characterized by their unique aromatic four membered ring system derived from squaric acid.
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Many of the synthesized rotaxanes were used for different applications. 119 For example, Tian et al. synthesized a rotaxane containing an α-CD macrocycle and an azobenzene chain capped on both ends with different fluorescent naphthalimide derivatives. 120 The cis–trans isomerization of the azobenzene unit resulted in the shuttling of α-CD and the change in fluorescence intensity of the two ...
Jan 12, 2021 · A characteristic of rotaxane is that the cyclic molecule and the linear molecule are not covalently bound. Hence, the cyclic molecule can rotate and slide along the linear molecule (Fig. 2 ).
