Synthesis of Quinone-linked Porphyrin Dimer, Trimer, and Tetramer As Models for Photosynthetic Reaction Center

As models for the photosynthetic reaction center, conformationally restricted quinone-linked porphyrin dimer, trimer, and tetramer were synthesized. The Soret bands of these zinc complexes are blue-shifted or split due to the exciton coupling depending on the geometries and compositions. The fluorescence intensities of these models are significantly reduced by the attached quinone, indicating the efficient electron transfer to the quinone.