Novel Phenothiazinium Photosensitizers For Photodynamic Therapy

The replament of the oxygen atom in benzophenoxazines with sulfur leads to the corresponding phenothiazinium ehromophorus The effect that this change, as well as other structural alterations, has on photosensitized singlet oxygen formation partitioning coefficient, and in-vitro phototoxicity is presented. A brief discussion concerning how structural modifications can bring about changes in these parameters is also presented. Preliminary results suggest that some phenothiazines could be promising photosensitizers for photodynamic therapy.