Figure 2.

(A) Spectral changes upon the reduction of 0.1 mM naphthalene cation radical by an incremental addition of 0.77 mM solution of ^ROPP₂ in dichloromethane at 20 °C (25 μL increments). (B) A plot of the increase of the absorbance of ^ROPP₂^+• (monitored at 832 nm) and depletion of the absorbance of naphthalene cation radical NAP^+• (monitored at 672 nm) against the equivalent of added ^ROPP₂. (C) Electronic spectra of various ^ROPP_n^+•, generated as in part A; see Figure S33 in the Supporting Information for the wavelength vs absorption plot. The separation of ∼1300 cm^–1 between the vibronic peaks suggests that the vibronic structure arises due to the backbone C–C bond vibrations.³⁸