Fig. 6. (a) UV/Vis absorption spectra for titration of tri-n-butyl phosphine oxide (guest) into 10 in n-octane at 298 K. The initial spectrum is shown in black, and the final spectrum in red. (b) Changes in absorbance at 271 and 237 nm are shown as points, and the lines are the best fit to a 1 : 1 binding isotherm.
