Tuning Hofmeister ion sensitivity in porphyrin J-aggregation through molecular charge density

This study investigates the self-assembly kinetics of three structurally related sulfonatophenylporphyrins, 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrin (TPPS 4 ), 5,10,15-tris(4-sulfonatophenyl)-20-phenyl-porphyrin (TPPS 3 ) and 5,15-bis(4-sulfonatophenyl)-10,20-phenyl-porphyrin (t-TPPS2) into supramolecular J-aggregates in acidic aqueous solutions, using a series of inorganic acids. The aggregation process, followed by UV/Vis spectroscopy, monitoring the characteristic B-band disappearance