Photophysical and photochemical parameters for SiPc-PQ 2, SiPc-COOH 3, RGD-SiPc 4, RGD-Linker-SiPc 5, RGD-(Linker)2-SiPc 6 and RGD-(Linker)2-Glu-SiPc 7 in DMSO. ΦF: fluorescence quantum yield; τF: fluorescence lifetime; ΦΔ: singlet oxygen quantum yield. For the reference standard, ZnPc was used; ΦΔ = 0.67.