Photoinduced Charge Separation for Bioenergy Applications

Hiroshi Imahori^a^,^b

^aInstitute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510

^bDepartment of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510

Proceedings of International Conference on Bio Energy (Bioenergy14)

Torremolinos, Spain, 2014 June 2nd - 3rd

Organizer: Francisco Fabregat-Santiago

Invited Speaker, Hiroshi Imahori, presentation 008
Publication date: 10th April 2014

Photoinduced charge separation (CS) is a key process of natural photosynthesis. In this regard our group has been working on artificial photosynthesis and solar energy con-version based on large aromatic molecules, i.e., porphyrins as well as nanocarbon materials, i.e., fullerenes, carbon nanotubes, and graphenes. One of new directions in our research is to apply our materials to cell biology and medi-cine, which allows us to develop novel cross-disciplinary research and innovation. In this talk we focus on nanoscale electric field of a photogenerated charge-separated state of a donor-acceptor linked molecule. If this molecule can be incorporated unidirectionally into the intact biological membrane and then the charge-separated state is generated by photoinduced electron transfer, the extremely large electric field (~106 V cm–1) of the photogenerated charge-separated state will affect voltage-gated ion channel, resulting in the switching of ion transport across the membrane. We chose ferrocene (Fc)-porphyrin (H2P)-C60 linked triads as a CS molecule, because the ability of generating a long-lived charge-separated state efficiently. Delivery of CS molecules to the plasma membrane of PC12 cells and subsequent light irradiation led to the depolarization in the membrane potential as well as the inhibition of potassium ion flow across the membrane. In this talk I will present our background on artificial photosynthesis and solar energy conversion. In particular, porphyrin-sensitized solar cells will be highlighted. I will also focus on some of our repre-sentative examples of photoregulation of cellular functions.

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