“…For example, it has been shown that the cationbinding-dependant changes in their redox potential and fluorescence quenching may find applications in specific ion sensors and fluorescence switching devices, respectively. The linker moiety is used for attaching the crown ether moiety onto the fullerene core through standard reaction protocols, including 1,3-dipolar cycloaddition with azomethine ylides [2,12] or diazomethane derivatives, [10,18] [4+2] cycloaddition with dienes [4] or quinodimethane precursors, [3,7] and the Bingel reaction with malonates (Scheme 1). [10] More importantly, the covalent linkage of a crown ether moiety on the fullerene core is a unique approach to the construction of functional supramolecular fullerene assemblies, [11] such as exTTF-C 60 dyads (exTTF = p-extended tetrathiafulvalene), [12] self-assembled carbon nanotube/fullerene donor-acceptor hybrids, [13] fullerene dimers, [14] [60]fullerene-based rotaxanes, [15] fullerene-based thin films formed by self-assembled monolayers (SAMs) of C 60 , [16] as well as Langmuir-Blodgett films.…”