Fig.10 Excited state relaxation kinetic of TPPS4 in: ethanol (c=5*10-5M [t =7.9 ns]), aqueous solution at pH=7.5 (c=8*10-4M [t =3.1 ns]) and aqueous solution at pH=3.5 (J-agregato)(c=4*10-4M [t 1=27 ps ir t 2=1.44 ns]). l ex=532 nm, l m=590 nm.