Terminal Carboxylate Effects on the Thermodynamics and Kinetics of Cucurbituril Binding to Guests Containing a Central Bis(Pyridinium)-Xylylene SiteIago Neira, Marcos D. Garcia, Carlos Peinador & Angel Kaifer
A series of bis(pyridinium)-xylylene derivatives bearing carboxylate terminal groups were investigated as guests for the cucurbituril host in aqueous solution. While the presence of the terminal carboxylates has a modest effect on the thermodynamic stability of the complexes, the kinetics of complex association/dissociation is strongly affected. The relative position (meta, para) of the carboxylate group in relation to the pyridinium nitrogen also exerts a considerable effect on the binding kinetics.
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