“…28,[32][33][34][35][36][37] Moreover, the groups present at the porphyrin periphery (electron-withdrawing or electron-releasing), their position, oxidation state as well as the electronic nature of the central metal ion, and core structure, have a considerable effect on the redox characteristics of synthetic porphyrins. [38][39][40][41] Porphyrins show a strong absorption in the visible-light region, due to their protracted p-electron systems with considerable thermochemical stability, and thus are used as components of advanced materials. 42,43 Tetraphenylporphyrins that bear one, four and eight bromine substituents at the b-pyrrole positions have been extensively synthesized and explored on account of such facile and direct bromination at the porphyrin periphery.…”