Pseudorotaxanes consist of rod-like and ring-like molecules held together by weak intermolecular forces such as ion-dipole interactions, charge transfer, hydrogen bonding and p-p stacking. Previously unexplored [N,N'-bis(4-pyridyl)-4,4'-bipyridinium]2+ axle and bis(1,5-naphtho)-32-crown-8 (BN32C8) or bis(1,5-naphtho)-38-crown-10 (BN38C10) wheels have been used to synthesize rare blue-colored [2]pseudorotaxanes and characterized by UV�vis, 1H NMR spectroscopy, and electrochemistry.  Their metal binding properties toward CdI2 and HgCl2 in solution and solid state have been studied by optical absorption and X-ray crystallography respectively.   We studies contrasting structures of the same metal and different wheels or the same wheel and different metals. We also dicovered for the first time that a simple metal complex, such as Hg2Cl62�, can induce a blue/red linear dichroism by organizing the [2]pseudorotaxane units into a columnar arrangement in the crystal.

Metal binding properties and dichroism of linear, rigid-axle [2]pseudorotaxanes

244th National Meeting (2012)

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