1381803-95-7Relevant academic research and scientific papers
Kinetics of formation of the host-guest complex of a viologen with cucurbit[7]uril
Kalmár, József,Ellis, Shawna B.,Ashby, Michael T.,Halterman, Ronald L.
, p. 3248 - 3251 (2012)
Host-guest complexation between the dicationic viologen 1-tri(ethylene glycol)-1′-methyl-m-xylyl-4,4′-bipyridinium and cucurbit[7]uril (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-1s-1 and k-1 = 52.7 ± 0.4 s-1, respectively. Possible mechanisms of complexation are discussed in view of the kinetic results.
