Recent development of artificial photosynthetic systems using photofunctional nanomaterials composed of multiporphyrins and carbon-based p-electron acceptors such as fullerenes, carbon nanotubes and a new type of nanocarbon is reviewed by focusing on their photoinduced electron-transfer properties. Electron donor-acceptor ensembles composed of porphyrins and fullerenes are described, covering small electron donor-acceptor dyads to larger multi-component systems including porphyrin-based photofunctional nanometerials. Such photofunctional nanomaterials composed of multiporphyrins and carbon-based p-electron acceptors (in particular C 60 ) have been utilized to construct efficient light energy conversion systems such as photovoltaic devices.

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A Ni(II) complex bearing an SN-type tetradentate ligand inspired by the active site of carbon monoxide dehydrogenase was found to selectively catalyze CO reduction to produce CO in a photocatalytic system using [Ru(bpy)] (bpy = 2,2'-bipyridine) as a photosensitizer and 1,3-dimethyl-2-phenyl-2,3-dihydro-1H-benzo[d]imidazole (BIH) as an electron donor. The Ni(II) complex shows a high turnover number over 700 with high CO selectivity of >99% and quantum yield of 1.42% in the photocatalytic system.