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21,23-Dithiaporphyrins 2–11 were prepared as analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin 1 to examine the impact of electronic properties at the 5- and 20-meso-positions. The effects of the electronic properties at the meso-rings were not significant with respect to absorption spectra, quantum yields for the generation of singlet oxygen and for fluorescence...
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