Abstract
The light-harvesting complex 1(LH1) of bacterial photosynthesis harvests sunlight and transfers the energy to its inner reaction center (RC) core to drive the photosynthetic process. After chemical oxidation of the LH1 complexes of Rhodobacter sphaeroides, charge migration within the bacteriochlorophyll a (BChla) molecular array is observed at very low temperature, suggesting this protein complex as a paradigm for charge migration in the solid state and nanotechnology development. A fundamental question is whether the two BChla molecules of the α/β BChla2 structural building block function as an interacting unit for charge migration or as individual molecules. The basic charge-migration unit of LH1 of Rb. sphaeroides has been investigated by continuous-wave electron nuclear double resonance (ENDOR) at 10 K. From the hyperfine coupling constants of the unpaired electron with its neighboring atoms, the basic charge-migration unit explored by ENDOR is consistent only with a monomer of BChla.
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