Syntheses, photophysical and first aspects of the photosensitizing properties of a new water-soluble SiPc

Hydrophilic silicon phthalocyanines derivatives with diaxial polyethyleneglycolmonomethylether ligand with different chain lengths were synthesized. Water soluble SiPc(OmPEG 5000)2 shows a completely monomeric UV/VIS spectrum in water. No influence of the ligand's chain length on photophysical properties, e.g., singlet oxygen quantum yield was found. First aspects of the photosensitizing properties were gained by photohemolyse experiments with human erythrocytes. SiPc(OmPEG 5000)2 is far more active than other water soluble phthalocyanines which are aggregated in water.