Author/Authors :
R. Hauschild، نويسنده , , G. Riedel، نويسنده , , F. G. FELSENSTEIN R. F. PARK and F. J. ZELLER، نويسنده , , T.S. Balaban، نويسنده , , V.I. Prokhorenko، نويسنده , , H. Kalt، نويسنده , , N. Berova، نويسنده , , X. Huang، نويسنده , , R. Pescitelli، نويسنده , , K. Nakanishi، نويسنده ,
Abstract :
Time resolved fluorescence spectroscopy was carried out on porphyrin-based artificial light harvesting molecules (ALHM). The ALHMs are dyads consisting of zinc-tetraphenylporphyrin (Zn-TPP) as an antenna complex and a free-base tetraphenylporphyrin (TPP) as an energy trap. Both chromophores are covalently bound by a steroidal bridge in different configurations. We have observed energy transfer in the ALHMs with transfer times on the order of approximately 1 ns. We have also compared the energy transfer dynamics of these ALHMs differing in the link between the energy donor and the energy trap. Only when connected by a chemical bond does energy transfer from Zn-TPP to TPP occur. A spread in the energy transfer times was found which is attributed to the different configurations of the ALHMs under study.
Keywords :
Artificial light harvesting , Time-resolved fluorescence spectroscopy , F?rster transfer , energy transfer
