Photodynamic therapy (PDT) is based on the accumulation of a photosensitizer, such as a porphyrin or a chlorin, in a malignant tissue after its administration. Chlorins exhibit photophysical properties similar to those of the porphyrin macrocycles, but with intensified and red-shifted Q bands, making chlorin-containing systems even better candidates for PDT. In this contribution, we report the synthesis of 5,10,15-tris(pentafluorophenyl)-20-(4- pyridyl)porphyrin, (2) and its transformation to the novel chlorin derivatives 4, (5,10,20-tris(pentafluorophenyl)-15-(4-pyridyl)-tetrahydro-1H-N-methyl- pyrrolo [3,4-b]porphyrin and 5, (5,10,15-tris(pentafluorophenyl)-20-(4-pyridyl)- tetrahydro-1H-N-methyl-pyrrolo[3,4-b]porphyrin) by 1,3-dipolar cycloaddition with an azomethine ylide. The new products have been characterized by UV-Vis, 1H NMR and FAB-MS. The photophysics, photochemical and photobleaching properties of chlorin 4 have been evaluated. Its quantum yield of photobleaching (φPb, mol Einstein-1) was 0.047±0.014. In order to demonstrate the production of 1O 2 when 4 is used as a photosensitizer, uric acid tests have been carried out. The results indicate that chlorin 4 can be considered a promising photosensitizer in PDT.
CITATION STYLE
Maestrin, A. P. J., Ribeiro, A. O., Tedesco, A. C., Neri, C. R., Vinhado, F. S., Serra, O. A., … Cavaleiro, J. A. S. (2004). A novel chlorin derivative of meso-tris(pentafluorophenyl)-4- pyridylporphyrin: Synthesis, photophysics and photochemical properties. Journal of the Brazilian Chemical Society, 15(6), 923–930. https://doi.org/10.1590/S0103-50532004000600021
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