By a News Reporter-Staff News Editor at Life Science Weekly -- Data detailed on Biological Factors have been presented. According to news originating from Tempe, Arizona, by NewsRx correspondents, research stated, "In photosynthesis, sunlight is absorbed mainly by antenna chromophores that transfer singlet excitation energy to reaction centers for conversion to useful electrochemical energy. Antennas may likewise be useful in artificial photosynthetic systems that use sunlight to make fuels or electricity."
Our news journalists obtained a quote from the research from Arizona State University, "Here, we report the synthesis and spectroscopic properties of a molecular hexad comprising two porphyrin moieties and four coumarin antenna chromophores, all organized by a central hexaphenylbenzene core. Light absorbed by any of the coumarins is transferred to a porphyrin on the 1-10 ps time scale, depending on the site of initial excitation. The quantum yield of singlet energy transfer is 1.0. The energy transfer rate constants are consistent with transfer by the Forster dipole-dipole mechanism. A pyridylbearing fullerene moiety self-assembles to the form of the hexad containing zinc porphyrins to yield an antenna-reaction center complex. In the resulting heptad, energy transfer to the porphyrins is followed by photoinduced electron transfer to the fullerene with a time constant of 3 ps."
According to the news editors, the research concluded: "The resulting P circle+-C-60(circle-). charge-separated state is formed with an overall quantum yield of 1.0 and decays with a time constant' of 230 ps in 1,2-difluorobenzene as the solvent."
For more information on this research see: Artificial Photosynthetic Reaction Center with a Coumarin-Based Antenna System. Journal of Physical Chemistry B, 2013;117(38):11299-11308. Journal of Physical Chemistry B can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Journal of Physical Chemistry B - www.pubs.acs.org/journal/jpcbfk)
The news correspondents report that additional information may be obtained from V. Garg, Arizona State University, Dept. of Chem & Biochem, Center Bioinspired Solar Fuel Prod, Tempe, AZ 85287, United States. Additional authors for this research include G. Kodis, P.A. Liddell, Y. Terazono, T.A. Moore, A.L. Moore and D. Gust (see also Biological Factors).
Keywords for this news article include: Tempe, Arizona, Fullerenes, United States, Nanotechnology, Biological Factors, Emerging Technologies, North and Central America
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