Study of the Counter Anions in the Host-Guest Chemistry of Cucurbit[8]uril and 1-Ethyl-1′-benzyl-4,4′-bipyridinium
Figure 4
The absorption spectra of BEV-X2 ( M) with the addition of different equivalents of CB, (a) BEV-Cl2, (b) BEV-Br2, (c) BEV-I2, (d) BEV-(PF6)2, and (e) BEV-(ClO4)2, respectively. The concentrations of CB added are 0.05, 0.075, 0.1, 0.125, 0.15, 0.175, 0.2, 0.225, 0.25, 0.275, 0.5, 0.525, 0.75, 1.0, 1.25, and 1.5 equivalents, respectively. The arrows indicate how the absorption bands respond to the increases of the CB concentration.
