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Photosynthetic Reaction Center Mimicry of a “Special Pair” Dimer Linked to Electron Acceptors by a Supramolecular Approach: Self‐Assembled Cofacial Zinc Porphyrin Dimer Complexed with Fullerene(s)
Author(s) -
D'Souza Francis,
Chitta Raghu,
Gadde Suresh,
Rogers Lisa M.,
Karr Paul A.,
Zandler Melvin E.,
Sandanayaka Atula S. D.,
Araki Yasuyaki,
Ito Osamu
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200600885
Subject(s) - supramolecular chemistry , dimer , porphyrin , photosynthetic reaction centre , fullerene , chemistry , photochemistry , electron transfer , crown ether , photoinduced electron transfer , electron acceptor , self assembly , crystallography , ion , organic chemistry , crystal structure
Biomimetic bacterial photosynthetic reaction center complexes have been constructed using well‐defined self‐assembled supramolecular approaches. The “special pair” donor, a cofacial porphyrin dimer, was formed via potassium ion induced dimerization of meso ‐(benzo‐[15]crown‐5)porphyrinatozinc. The dimer was subsequently self‐assembled with functionalized fullerenes via axial coordination and crown ether–alkyl ammonium cation complexation to form the donor–acceptor pairs, mimicking the noncovalently bound entities of the photosynthetic reaction center. The adopted self‐assembly methodology yielded supramolecular complexes of higher stability, with defined geometry and orientation. Efficient forward electron transfer from the singlet excited zinc porphyrin dimer to the fullerene entity and relatively slow reverse electron transfer, important steps in the photosynthetic light energy conversion have been achieved in these novel biomimetic model systems.