A rigidity-modulated approach toward the construction of metallacycles from a flexible tetratopic ligand

Abstract

Conformation control of a flexible tetratopic ligand by modulation of the length of the rigid bridging ligand is achieved during the self-assembly of metallacycles. The ability to control the conformation of the flexible ligand using an ancillary rigid ligand provides a new method for the preparation of novel metallacycles that contain both flexible and rigid modules with highly accurate prediction of the final structures. © 2009 American Chemical Society.