Porphyrin compounds having groups that mimic the phenolic moiety of m-and p-isomers of 5, 10, 15, 20-tetrakis (hydroxyphenyl) porphyrin (THPP) have been synthesized along with 5, 10, 15, 20-tetrakis (heteroaryl) porphyrins bearing 2-thienyl and 5-thiazolyl groups. Absorption and fluorescence spectroscopy, including fluorescence lifetime (τf) and quantum yield (Φf) measurements, were employed to characterize the singlet excited state of all ...