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.
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