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Singlet oxygen generation via two-photon excited FRET. 2004
William R Dichtel, and
Jason M Serin, and
Carine Edder, and
Jean M J Fréchet, and
Michael Matuszewski, and
Loon-Seng Tan, and
Tymish Y Ohulchanskyy, and
Paras N Prasad
Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
A new approach to two-photon excited photodynamic therapy has been developed. A dendritic array of eight donor chromophores capable of two-photon absorption (TPA) was covalently attached to a central porphyrin acceptor. Steady-state fluorescence measurements demonstrated that the donor chromophores transfer excited-state energy to the porphyrin with 97% efficiency. Two-photon excitation of the donor chromophores at 780 nm resulted in a dramatic increase in porphyrin fluorescence relative to a porphyrin model compound. Enhanced singlet oxygen luminescence was observed from oxygen-saturated solutions of the target compound under two-photon excitation conditions.
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