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Molecular
Separations
Molecular
square materials demonstrate sieving behavior such that molecules larger
than
the intrasquare cavity are excluded from diffusion though a thin film of
squares.
By
depositing a thin film of molecular squares on an electrode, we are able
to
electrochemically
detect the exclusion of a large molecule from the square cavities.
Cyclic voltammograms
obtained in a solution containing ferrocenemethanol
and iron tris(bathophenanthroline
disulfonate) using (top) a bare electrode
and (bottom)
the electrode bearing a thin film of molecular square.
Demonstration
of pore-limited size exlusion through a polymeric membrane
comprised of
molecular square monomers. A combination of silver nanoprisms
(80 nm) and Ru(bpy)3
(1.3 nm) in water is introduced to a flow cell where the
cavities are
separated by a molecuar square membrane (pore size ~ 2.4 nm).
Subsequently,
only the yellow Ru(bpy)3 diffuses across the membrane.
Contact Jodi
O'Donnell for more information about molecular separations.