Photosensitization porphyrins

The D, A or PS units may be metal coordination centres. Metal to ligand charge transfer (MLCT) in metal complexes (such as Ru(n) or Re(l)-diimine centres) has been extensively used for generating PeT processes [8.64-8.68, A. 10, A.20]. Our own work has been concerned with photoinduced charge separation in macropoly-cyclic coreceptors containing both a photosensitive porphyrin group and binding sites for silver(i) ions as acceptor centres. Thus, complexation of silver ions by the... 

The formation of the starter radical(s) and the radical chemistry at the photosensitized porphyrin still has to be experimentally proven and is hypothesized by analogous reactions. 

While topical ALA penetrates the outer layers of intact epidermis very much better than any pre-formed photosensitizers (porphyrins, chlorins, purpurins, or phthalocyanines), it still requires at least several hours for photosensitizing concentrations of PpIX to accumulate within the underlying cells, and even longer if the cells are deeper. Two main approaches to enhancing the penetration of ALA through biological barriers such as the stratum corneum are current topics of research in several laboratories. 

Phytoalexins and Phototoxins in Plant Pest Control presents a model approach to the binding of a phytoalexin elicator to DNA, studies of phytoalexins in cotton and peanuts, chapters on phototoxic metabolites of tropical plants and on photosensitizing porphyrins as herbicides. 

H. Schneckenbuiger, A. Riick, B. Baros, R. Steiner, Intracellular distribution of photosensitizing porphyrins measured by video-enhanced fluorescence microscopy. J. Photochem. Photobiol. B 2, 355 (1988)... 

Luechai A, Gasiorowski J, Petsom A et al (2012) Photosensitizing porphyrin-triazine compound for bulk heterojunction solar cells. J Mater Chem 22(43) 23030-23037... 

H. Schneckenburger, K. Konig, K. Kunzi-Rapp, C. Westphal-Frosch, A. Ruck, Time-resolved in-vivo fluorescence of photosensitizing porphyrins, J. Photochem. Photobiol. B. Biol. 21 (1993), 143-147. 

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