Axially coordinated porphyrins as new rotaxane stoppers

Abstract

Coordination to the axial position of the metalloporphyrin Ru(TTP)(CO) is an effective means to end-cap the 1,2-bis(4,4′-dipyridinium)ethane dication·dibenzo[24]- crown-8 [2]pseudo-rotaxane and generate the stable porphyrinic [2]rotaxane 4.