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


  • This work was supported by the Engineering and Physical Sciences Research Council (UK) and by BASF plc.


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A “cyclodextrin coat” dramatically enhances the stability of an azo dye towards reductive bleaching, oxidative bleaching, and photo-bleaching as is demonstrated by the rotaxane 1. This compound is obtained as a single isomer in high yield from the amine-substituted dye and trichlorotriazine in water in the presence of the cyclodextrin.