Resolution and Kinetic Stability of a Chiral Supramolecular Assembly Made of Labile Components Coordination Number Incommensurate Cluster Formation, Part 18. Financial support of this work was provided by NSF CHE-9709621 and by NSF and NATO-NSF exchange grants INT-9603212 and SRG 951516, respectively. We thank the Alexander-von-Humboldt Foundation for a Fellowship to A.T., and a Humboldt Research Award for Senior U.S. Scientists to K.R., and the Miller Foundation for a fellowship to M.Z. The authors gratefully acknowledge the assistance of Dr. F. J. Hollander and Dr. D. L. Caulder in selecting and mounting a suitable single crystal, and Prof. Julie A. Leary, Dr. Ulla N. Andersen, and J. J. Miranda for measuring mass spectra. Part 17: M. Ziegler, J. J. Miranda, U. N. Andersen, D. W. Johnson, J. A. Leary, K. N. Raymond, Angew. Chem., in press.