Research Article

A Singlet Oxygen Photogeneration and Luminescence Study of Unsymmetrically Substituted Mesoporphyrinic Compounds

Figure 5

Time-resolved laser-induced luminescence emission spectra of TPP (left column) and TBP (right column) in benzene. Spectra were registered with a 20 ms gate with at (a), (d) room temperature, in presence of O2 (air equilibrated samples), (b), (e) room temperature, in absence of O2 (argon purged samples), (c), (f) T = 77 K, in presence of O2 (air equilibrated samples), (50, 100, 150, 200 and 250 s, after laser pulse, resp., for curves 1 to 5 at 337 nm). The start delay was zero in (a) and (d) and 1  s in (b), (c), (e), and (f).
413915.fig.005