title: On the mechanism of action of gated molecular baskets: The synchronicity of the revolving motion of gates and in/out trafficking of guests.
abstract: We used dynamic (1)H NMR spectroscopic methods to examine the kinetics and thermodynamics of CH(3)CCl(3) (2) entering and leaving the gated molecular basket 1. We found that the encapsulation is first-order in basket 1 and guest 2, while the decomplexation is zeroth-order in the guest. Importantly, the interchange mechanism in which a molecule of CH(3)CCl(3) directly displaces the entrapped CH(3)CCl(3) was not observed. Furthermore, the examination of the additivity of free energies characterizing the encapsulation process led to us to deduce that the revolving motion of the gates and in/out trafficking of guests is synchronized, yet still a function of the affinity of the guest for occupying the basket: Specifically, the greater the affinity of the guest for occupying the basket, the less effective the gates are in "sweeping" the guest as the gates undergo their revolving motion.
authors.affiliation: Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus OH, 43210, USA.
authors.forename: Keith
authors.initials: K
authors.lastname: Hermann
authors.forename: Stephen
authors.initials: S
authors.lastname: Rieth
authors.forename: Hashem A
authors.initials: HA
authors.lastname: Taha
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Wang
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Hadad
authors.forename: Jovica D
authors.initials: JD
authors.lastname: Badjić