Excited state dynamics of meso-tetra(sulphonatophenyl) metalloporphyrins.
The excited state dynamics of Zn2+, Fe3+, and Mn3+ meso-tetra(sulfonatophenyl) porphyrin complexes were investigated with a Z-scan technique at 532 nm using 70 ps and 120 fs single pulses and 200 ns pulse trains of a Q-switched and mode locked laser. We determined the characteristic interconversion and intersystem crossing times, quantum yields of the excited S1 state, and S1 --> Sn and T1 --> Tn transition cross-sections. The ground state cross-sections were obtained using UV-vis absorption spectroscopy, and a five-energy-level diagram was used to yield the photophysical parameters mentioned previously.
Gonçalves
P J
PJ
Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, São Carlos, Brazil. pablo@ifsc.usp.br
De Boni
L
L
Borissevitch
I E
IE
Zílio
S C
SC
D005453:Fluorescence; D008665:Metalloporphyrins / Q000737:chemistry*; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
D008665:Metalloporphyrins