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This Letter, describes the complexation of α-, β- and γ-cyclodextrins (1–3) with TTF derivative 4 in water. In particular, we show using 1H, 13C NMR, UV–vis spectroscopy and isothermal titration calorimetry that β-cyclodextrin 2 forms an effective complex with 4. Complex 2·4 can be conveniently disassembled upon the addition of 1-adamantanol.

This article reports the characterization of pseudorotaxanes fabricated from cyclobis(paraquat-p-phenylene) 1, and 1,4-dialkyloxyphenyl derivative 2 or 1,5-dialkyloxynaphthalene derivative 3 in water. Addition of competing guest 3 to 1.2 or the electrochemical reduction of the cyclophane of 1.3 results in a dethreading of the original pseudorotaxane architecture.

We report the synthesis of a cyclodextrin-based molecular adapter which has the propensity to form an electrochemically tuneable ternary complex with cyclophanes 2 or 3 and ferrocene 4 in non-aqueous and aqueous environments, respectively.

The photophysical properties of a pH dependent molecular switch based on pyridin-4-yl indolizin β-cyclodextrin 1 in water are described. The reversibility phenomena of fluorescent emission is attributed to a molecular motion of enclosed fluorescent moiety to inside/outside location.