Kinetics of Formation of the Host–Guest Complex of a Viologen with Cucurbituril
Host–guest complexation between the dicationic viologen 1-tri(ethylene glycol)-1′-methyl-m-xylyl-4,4′-bipyridinium and cucurbituril (CB7) was studied at pH = 4.5 in water. The stability constants of the mono- and bis-CB7 adducts were determined at 25 °C by UV–vis spectroscopy. Stopped-flow kinetic experiments were performed to measure the formation and dissociation rate constants of the monoadduct: k1 = (6.01 ± 0.03) × 106 M–1 s–1 and k–1 = 52.7 ± 0.4 s–1, respectively. Possible mechanisms of complexation are discussed in view of the kinetic results.
R. L. Halterman, J. Kalmár, S. B. Ellis, M. T. Ashby, SupraBank2022, Kinetics of Formation of the Host–Guest Complex of a Viologen with Cucurbituril (dataset). https://doi.org/10.34804/supra.2021092869