Figure 2.

UV–visible spectra of [(4-RPh)₃C]+/•/– measured at room temperature. (a) Absorbance spectra of radicals plotted as molar extinction coefficient (ε_M) in M^–1 cm^–1. Each radical spectrum is reported in toluene, except [Me₂N]•, which is reported in MeCN. (b) Absorbance spectra of the carbocations in DCM, plotted as ε_M, generated from the reaction of the triarylmethyl halide with AgOTf except for crystal violet. (c) Absorbance spectra of the carbanions in THF, plotted as ε_M, generated from reduction of the triarylmethyl halide with KC₈ or from deprotonation with TBAOH. Estimated ε_M values for the carbocations and carbanions are presented in Table S1.