2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Noncovalent Catenation between Metal-Ligand Coordination Macrocycles and _-Cyclodextrin

Y. Liu
Lawrence Berkeley National Laboratory, US

[2]catenane, macrocycle, cyclodextrin, coordination

Here we describe our findings on the facile preparation of first [2]catenanes from metal-ligand coordination macrocycles and b-CD ring. The [2]catenane formation is illustrated in Figure 1. Coordination between a divalent ligand and Pd(II) spontaneously gives rise to a macrocycle. This macrocycle is able to interlock with b-CD as a result of the hydrophobic interaction between the divalent ligand and b-CD ring. The complexation between the two ring components undergoes dynamic equilibrium in solution. The catenane formation was illustrated by various 1H NMR spectroscopic methods and UV-vis spectroscopic methods. By changing the metal center from Pd(II) to Pt(II), the dynamic nature of the [2]catenanes was altered to a “locked” one because the Pt(II)-pyridine coordination bond is irreversible (“locked”) under ordinary conditions in contrast to the reversible Pd(II)-pyridine bond. The reported method provides an extremely simple and highly efficient approach in generating [2]catenanes from readily available starting materials. Such findings will be extended towards the development of higher order polymers and switchable devices with embedded b-CD units.

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