Gratifyingly, irradiation with 400 nm light effected gradual conversion of TpBPA .+ to TpBPA, corroborating the expected SET from mesitylene to the photoexcited TPA .+ . Interestingly and in contrast, the spectrum of TCBPA .+ was altered by addition of PhCl; a small bathochromic perturbation of the peak at 384 nm to 395 nm occurred, indicating complexation between TCBPA .+ and PhCl. Irradiation with 400 nm led to complete conversion of TCBPA .+ to TCBPA after 5 min.