Cover Feature: Pentafluorophenyl Esters as Exchangeable Stoppers for the Construction of Photoactive [2]Rotaxanes (Chem. Eur. J. 33/2021)

Abstract

Rotaxane building blocks with pentafluorophenyl ester stoppers have been efficiently prepared and their treatment with various nucleophiles provided a wide range of rotaxanes with amide, ester or thioester stoppers. This new strategy also gave easy access to a photoactive rotaxane incorporating a fulleropillar[5]arene moiety and two Bodipy stoppers. Despite the absence of covalent connectivity between the Bodipy subunits and the fullerene, efficient through space excited state interactions have been evidenced in this rotaxane. More information can be found in the Full Paper by J.‐F. Nierengarten et al. (DOI: 10.1002/chem.202100943).