Controlled Photophysical Behaviors between Dibenzo-24-crown-8 Bearing Terpyridine Moiety and Fullerene-Containing Ammonium Salt

A novel [2]pseudorotaxane was successfully constructed by the complexation of dibenzo[24]-crown-8 (DB24C8) derivative bearing terpyridine moiety (1) with lanthanide ion (Tb3+) and fullerene-containing ammonium salt (2), exhibiting the controlled photophysical behaviors as a reversible luminescent lanthanide switch in the presence of K+ or 18-crown-6 (18C6).