Abstract
Triplet state properties of solutions containing chlorophyll monomers and dimers have been determined by optically detected magnetic resonance (ODMR) spectroscopy. Using a simple exciton formalism, the triplet state zero-field splittings and intersystem crossing rate constants found for the chlorophyll dimers and for the isolated chlorophyll molecule are utilized to determine the orientation of the pigment molecules in the dimer. The triplet state results indicate that water-linked chlorophyll dimers in vitro form single plane-parallel structures. Similar calculations using monomeric measurements by ODMR on bacteriochlorophyll and zero-field splittings for in vivo preparations of photosynthetic bacteria indicate that the dimer structures in vivo may be more complex than those observed in solution.
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