Infrared Spectroscopy and Electrochemistry of Chlorophylls: Model Compound Studies on the Interaction in Their Native Environment
In the primary reactions of photosynthesis, the light-induced charge separation and stabilization involves the generation of a radical cation and of radical anions at the various steps of electron transfer. The basic units that can perform these processes — called photosynthetic reaction centers (RC) — are well-characterized for bacterial photosynthesis in their structure1,2 and function (for a review, see Parson3). In bacterial RC, the primary electron donor (P) is a bacteriochlorophyll (BChl) a or b dimer and the first electron acceptor a bacteriopheophytin (BPheo) a or b molecule. They are embedded in the protein matrix and provided with very specific interactions that seem to be responsible for the spectral and redox properties of the pigments in their native environment as well as for the efficiency and specificity of electron transfer. X-ray structure analysis1 has demonstrated the close proximity of protein residues to carbonyl groups of the pigments, thus suggesting H-bonding.
KeywordsFull Line Bond Order Cation Formation Photosynthetic Reaction Center Primary Electron Donor
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