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A Novel 2,2′‐Bipyridine[2]catenane and Its Ruthenium Complex: Synthesis, Structure, and Intramolecular Electron Transfer— A Model for the Photosynthetic Reaction Center
Author(s) -
Hu YiZhen,
Bossmann Stefan H.,
van Loyen Dietmar,
Schwarz Oliver,
Dürr Heinz
Publication year - 1999
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/(sici)1521-3765(19990401)5:4<1267::aid-chem1267>3.0.co;2-t
Subject(s) - catenane , chemistry , ruthenium , intramolecular force , photochemistry , electron transfer , bipyridine , photoinduced electron transfer , flash photolysis , photosynthetic reaction centre , cyclic voltammetry , stereochemistry , crystallography , molecule , electrochemistry , crystal structure , organic chemistry , catalysis , physics , quantum mechanics , electrode , reaction rate constant , kinetics
The complexation of a novel [2]catenane incorporating 2,2′‐bipyridine and cyclobis(paraquat‐ p ‐phenylene) within a ruthenium complex afforded a catenane‐type artificial‐photosynthesis assembly. Studies by X‐ray analysis, molecular modeling (MM2), NMR, and cyclic voltammetry revealed the catenane structure and indicated conformers with different sensitizer–acceptor distances. Emission studies and laser flash photolysis confirmed the occurrence of efficient photoinduced electron transfer between the noncovalently linked sensitizer (Ru 2+ center) and the acceptor (bisviologen), as depicted. Biexponential decay with long‐lived charge‐separated states was observed.