P680, or Photosystem II primary donor, (where P stands for pigment) is a group of pigments associated with photosystem II and consists of 4 chlorophyll a molecules. These four molecules are excitonically coupled which means that they effectively act as a single entity, i.e. they are excited as if they were a single molecule. The 680 number is its absorption maximum in the red part of the visible spectrum.
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- P680, or Photosystem II primary donor, (where P stands for pigment) is a group of pigments associated with photosystem II and consists of 4 chlorophyll a molecules. These four molecules are excitonically coupled which means that they effectively act as a single entity, i.e. they are excited as if they were a single molecule. The 680 number is its absorption maximum in the red part of the visible spectrum. The primary donor receives excitation energy either by absorbing a photon of suitable frequency (colour) or by excitation energy transfer from other chlorophylls within photosystem II. During excitation an electron is excited to a higher energy level. This electron is subsequently captured by the primary electron acceptor, a pheophytin molecule located within photosystem II near P680. The oxidized P680 (P680) is subsequently reduced by an electron originating from water. P680 is the strongest biological oxidizing agent known. It has an estimated redox potential of ~1.3 V. This makes it possible to oxidize water during oxygenic photosynthesis.
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- P680, or Photosystem II primary donor, (where P stands for pigment) is a group of pigments associated with photosystem II and consists of 4 chlorophyll a molecules. These four molecules are excitonically coupled which means that they effectively act as a single entity, i.e. they are excited as if they were a single molecule. The 680 number is its absorption maximum in the red part of the visible spectrum.
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