Fig. 1. Aggregation-enhanced photodynamic effect of PcN4-BA. (a) Molecular structure of PcN4-BA. (b) Absorption and (c) emission (excited at 635 nm) spectra of PcN4-BA (10 μM) in a mixed solution of DMF and H2O with various ratios. TA spectra of PcN4-BA in (d) DMF and (e) H2O and (f and g) normalized decay profiles in mixed solutions of DMF and H2O at various ratios (excited at 680 nm). D8H2 indicates that the ratio of DMF : H2O is 8 : 2. (h) ROS generation plot of PcN4-BA in mixed solutions of DMF and H2O at various ratios detected using 2,7-dichlorofluorescin diacetate (10 μM) as the fluorescent probe. (i) Schematic diagram of the electronic structure of monomeric and aggregated PcN4-BA and their possible photophysically activated process.
