Design and conception of photosensitizers.- Recent developments in the synthesis of porphyrin and phthalocyanine photosensitizers and related systems.- The contribution of theoretical chemistry to the drug design in photodynamic therapy.- Photochemical and photophysical characterization.- Sensitization of singlet oxygen formation in aqueous media.- The use of phthalocyanines and related complexes in photodynamic therapy.- Combination Therapy: Complexing of QDs with tetrapyrrols and other dyes.- Exogenously induced endogenous Photosensitizers.- Photocatalytic degradation of pollutants with emphasis on phthalocyanines and related complexes.- Photocatalysis for synthetic purposes.- Photosensitizers in solar energy conversion.- Chromophores for optical power limiting.