Excited state dynamics studies of iron(III) phthalocyanine using femtosecond pump–probe techniques

Iron(III) tetracarboxylic phthalocyanine (FePcC) was synthesized and the S1 excited state dynamics of the monomer solution was investigated by femtosecond (fs) pump–probe and picosecond time-resolved photoluminescence (ps-TRPL) measurement. The singlet state S1 relaxation comprises of three components with lifetimes of hundreds of fs, 130 ps and 1.3 ns, respectively. The fs optical Kerr effect (OKE) signals of FePcC show an ultrafast response under both on-resonant and off-resonant excitation. The magnitude of χ(3) in FePcC was determined to be about 10−11 esu (corresponding to 10−19 m2 V−2) under both on-resonant and off-resonant conditions.