PyC60-naphthacrown system: a new supramolecular recognition element.

Abstract Fulleropyrrolidine (PyC 60 ) and a binaphthyl bridged crown ether macrocyclic receptor ( 1 ) undergoes spontaneous self-assembly phenomenon in solution to generate a new supramolecular recognition element having binding constant value of ∼5.83 × 10 4  dm 3  mol −1 . Lifetime measurement reveals a static quenching mechanism behind the deactivation of photoexcited state of 1 in presence of PyC 60 . The results obtained from this work would definitely reinforce bridged cyclic crown ether as one of the most suitable fragments for the molecular recognition of various macrocyclic receptor(s) in near future.