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    Photoinduced hydrogen evolution by use of porphyrin, EDTA, viologens and hydrogenase in solutions and Langmuir-Blodgett films

    Year: 2002

    Journal: -, 20111221

    Authors: Dong-Jin Qian, Stephan-Olav Wenk, Chikashi Nakamura, Tatsuki Wakayama, Nikolay Zorin, Jun Miyake

    Organizations: aTissue Engineering Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba Central 4, (AIST) 1-1-1 Higashi, Tsukuba, Ibaraki 305-8562, Japan bInstitute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region 142290, Russia

    Photoinduced hydrogen evolution was investigated by use of a zinc porphyrin, EDTA, viologens and hydrogenase (H2ase) in the solutions and Langmuir-Blodgett (LB) films. An almost linear increase of hydrogen evolution rate was observed with the increase of H2ase concentrations from1 to 5 μg=ml. For the zinc porphyrin, EDTA and methyl viologen, when their concentrations increased to a given value, hydrogen evolution did not show obvious increase. Phospholipid-porphyrin mixed LB films were prepared and used as photosensitizer for the photoinduced hydrogen evolution. Spectroscopic studies of the deoxygenated solutions indicated a "new" absorption band (in the solutions) or sharp peaks (in the LB films) when the sample solutions were irradiated, which was ascribed to the formation of an excited complex of porphyrin-EDTA (or EDTA breakdown products). This excited complex was unstable to air.