Synthesis and Spectral Properties of Phenylene Dendrimers Based on Porphyrazines

摘要

Owing to their potential applications as photosensitizers in solar energy conversion and photodynamic therapy,phthalocyanines and their metal complexes have recently received considerable attention.Their characterization was influenced by the nature of the peripheral substituents and the central metal ion.One of the intrinsic problems of using phthalocyanine macrocycles is their strong stacking tendency to form aggregated species in solution.It has been found that such stacking can lead to an efficient nonradioactive energy relaxation,reducing the triplet-state population and,consequently,significantly decreasing the photosensitizing efficacy.