Figure 1

Structure and physical properties of the cationic porhyrins. (A) Structure of cationic porphyrins 5,10,15,20-tetra(N-methyl-4-pyridyl) porphin (TMPyP4 or P4); 5,10,15,20-tetra(N-methyl-2-pyridyl)porphin (TMPyP2 or P2) and 5,10,15-tri(N-methyl-4-pyridyl)20(N-C₁₄H₂₉)-4-pyridyl) porphin (C14); (B) DMA assay to determine the singlet oxygen quantum yield of porphyrins P2, P4 and C14. Full lines are the best-fit of experimental points to first order decay equation y = exp(-kt). Irradiation was performed with 60 mW lamp. Fluorescence quantum yield data are from [34]; (C) Singlet oxygen and fluorescence quantum yield values.