Rotaxane-Encapsulation Enhances the Stability of an Azo Dye, in Solution and when Bonded to Cellulose

The synthesis and spectral properties of an encapsulated aminoazobenzene dye

“…The rotaxanated azo dye was synthesized by following previous reports [5,7,8] and using N,N-dimethyl-1-naphthylamine as the coupling components (Scheme 1).…”

“…An azo dye rotaxane has been synthesized as a single stereoisomer, with the 2,3-rims of both CDs pointing outwards [7]. It was also reported that rotaxane-encapsulation enhances the stability of an azo dye without preventing the dye from binding to the surface of textile fibers [8]. When cellulosic fibers were dyed using a chlorotriazinefunctionalized azo dye rotaxane, the stability of the ensuing dyeing to bleach was dramatically increased.…”

“…However, despite earlier studies [5][6][7][8], there have been no reports on the effect of CD macrocycle on the color of threaded azo dyes. In the present study, an azo dye rotaxane having N,N-dimet hylamino end groups in the presence of a-cyclodextrin ( Fig.…”

Preparation of Polymeric Metal Complex Containing Azo Dye Rotaxane

“…Cyclodextrins (CDs) are cyclic oligosaccharides consisting of six ( -CD), seven ( -CD), or eight α β ( -CD) glucose units, and they provide a hydro γ -phobic cavity in a hydrophilic environment due to the existence of numerous hydroxyl groups all pointing out of the outside wall 7) . A rotaxane is a supramolecular assembly of a dumbbell-like component that has macrocycle around the molecular axis [8][9][10] . The formation of polymer-CD inclusions consists of CD molecules threading † Corresponding author.…”

Host/guest complex of Me-β-CD/2,2-dimethoxy-2-phenyl acetophenone for initiation of aqueous photopolymerization: Kinetics and mechanism

“…This inclusion complex leads to a significant change of the solution properties and reactivities of the guest molecule, but without any chemical modification [11][12][13][14][15][16][17]. And it also attracted more and more attention in recent years because of their potential to serve as molecular devices and molecular machines, as well as nanostructured functional materials, such as cyclodextrin-based light-driven molecular shuttle [18,19] and rotaxane-encapsulated dyes to prevent the chromophore degradation [20].…”