A Ring-in-Ring Complex We thank Dr. Peter T. Glink, Dr. M. Jane Strouse, and Dr. Ping Yang for useful discussions and both the National Science Foundation and the Petroleum Research Fund, administered by the American Chemical Society, for generous financial support.

A dicationic macrocycle containing two NH2+ centers can insert itself spontaneously inside bisparaphenylene[34]crown-10 to form a highly ordered, stable, 1:1 complex in solution, as well as in the solid state (see picture). The self-assembly of this superstructure, wherein the mean planes of the two macrocycles are aligned approximately orthogonally to one another, augurs well for the use of supramolecular assistance to covalent synthesis in the construction of interlocked molecular compounds beyond catenanes and rotaxanes.