This photon absorption causes an electron to be transferred from the special pai

Question

This photon absorption causes an electron to be transferred from the special pair to another, single molecule of chlorophyll. If the transformation from light energy to chemical energy is 100% efficient (and it actually is very nearly so) what is the minimum reduction potential that the accepter cholorphyll can have with respect to the donor?

LN Mg In the photosynthetic reaction center, the biomolecule in which solar energy conversion takes place, an unusual closely packed arrangement of two chlorophyll molecules, called the 'special pair, absorbs light at 870 nm (not coincidentally the solar emission maximum). Chlorophylls look like hemes but are designed to better do photochemistry:

Explanation / Answer

Ans.

The photo system consists of a molecular triad (i.e., with a donor, a photosensitive unit, and an acceptor) coupled to four accessory light-harvesting-antenna pigments. The resonant energy transfer from the antennas to the artificial reaction center (the molecular triad) by the Forester mechanism.If two different kinds of arrangements of the accessory light-harvest pigments around the reaction center. The first arrangement allows direct excitation transfer to the reaction center from all the surrounding pigments. The second configuration transmits energy via a cascade mechanism along a chain of light-harvesting chromophores, where only one chromophore is connected to the reaction center. The artificial photosynthetic system using the cascade energy transfer absorbs photons in a broader wavelength range and converts their energy into electricity with a higher efficiency than the system based on direct couplings between all the antenna chromophores and the reaction center.

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