Unusual Stepwise Protonation and J-Aggregation of meso-Tetrakis( N-methylpyridinium-4-yl)porphine on Binding Poly(sodium vinylsulfonate). - Castriciano, Maria Angela; Samperi, Mario; Camiolo, Salvatore; Romeo, Andrea; Monsù Scolaro, Luigi (Chemistry - A European Journal, 2013)