Light-harvesting complexes of green plants ..
Antenna Complexes for Photosynthesis - HyperPhysics …
A model photosynthetic antenna consisting of four covalently linked zinc tetraarylporphyrins, (P(ZP))3-P(ZC), has been joined to a free base porphyrin-fullerene artificial photosynthetic reaction center, P-C60, to form a (P(ZP))3-P(ZC)-PC60 hexad. As revealed by time-resolved absorption and emission studies, excitation of any peripheral zinc porphyrin moiety (P(ZP)) in 2-methyltetrahydrofuran solution is followed by singlet-singlet energy transfer to the central zinc porphyrin to give (P(ZP))3-1P(ZC)-P- C60 with a time constant of ~50 ps. The excitation is passed on to the free base porphyrin in 240 ps to produce (P(ZP))3-P(ZC)-1P-C60, which decays by electron transfer to the fullerene with a time constant of 3 ps. The (P(ZP))3-P(ZC)-P(·)+-C60(·)- charge-separated state thus formed has a lifetime of 1330 ps, and is generated with a quantum yield of 0.70 based on light absorbed by the zinc porphyrin antenna. The complex thus mimics the basic functions of natural photosynthetic antenna systems and reaction center complexes.
31/12/2017 · Antenna Complexes for Photosynthesis ..
Rienk van Grondelle studied physics at VU University Amsterdam. He obtained his Ph.D. under the supervision of Prof. Dr. Lou Duysens. In 1982, he returned to VU University, and in 1987, he was appointed full professor. At VU University, he has built a large research group studying the early events in photosynthesis. R.v.G. has made major contributions to elucidating the fundamental physical mechanisms that underlie light harvesting and charge separation. He has developed theoretical tools for understanding complex spectroscopic data. Using multidimensional electronic spectroscopy, he recently showed that ultrafast charge separation is driven by specific molecular vibrations that allow electronic coherences to stay alive. He proposed a molecular model for photoprotection and demonstrated that the major plant light-harvesting complex operates as a nanoswitch, controlled by its biological environment. These results, of utmost importance for understanding photosynthesis, have inspired technological solutions for artificial and/or redesigned photosynthesis, as a route toward sustainable energy production.