Excited state dynamics of meso-tetra(sulphonatophenyl) metalloporphyrins |
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Authors: | Gonçalves P J De Boni L Borissevitch I E Zílio S C |
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Institution: | Instituto de Física de S?o Carlos, Universidade de S?o Paulo, Caixa Postal 369, S?o Carlos, Brazil. pablo@ifsc.usp.br |
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Abstract: | 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. |
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