Fig. 3: Analysis of the charge-transfer band for the P(mes)3/B(C6F5)3 system.
From: Quantifying interactions in the active encounter complex of frustrated Lewis pairs
a Complexation for which Ka is being determined. b Solutions used in titration experiments; increasing magenta colour with increasing ratios of phosphine:borane. c Increasing intensity of charge-transfer band with increasing Lewis base concentration. d One of three plots of λmax absorbance as a function of phosphine:borane ratio, and the binding isotherm from the fit of these data, and the average Ka obtained from the three experiments.
