Premium
A Photosensitizer Dinuclear Ruthenium Complex: Intramolecular Energy Transfer to a Covalently Linked Fullerene Acceptor
Author(s) -
Guldi Dirk M.,
Maggini Michele,
Menna Enzo,
Scorrano Gianfranco,
Ceroni Paola,
Marcaccio Massimo,
Paolucci Francesco,
Roffia Sergio
Publication year - 2001
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 - 10.1002/1521-3765(20010417)7:8<1597::aid-chem15970>3.0.co;2-#
Subject(s) - ruthenium , photosensitizer , intramolecular force , fullerene , covalent bond , acceptor , photochemistry , chemistry , energy transfer , stereochemistry , organic chemistry , catalysis , physics , condensed matter physics , molecular physics
A fullerene derivative ( 5 ) in which a dinuclear ruthenium complex is covalently linked to a fulleropyrrolidine (FP) through a rigid spacer has been prepared through azomethine ylide cycloaddition to C 60 . Electrochemical and photophysical studies revealed that ground‐state electronic interactions between the bimetallic ruthenium chromophore and the FP moiety are small. The absorption spectrum of 5 displays a metal‐to‐ligand charge transfer (MLCT) transition at about 620 nm in CH 2 Cl 2 which is shifted by nearly 160 nm relative to that of a previously reported mononuclear dyad ( 8 ). The photophysical investigations have also shown that both in dichloromethane and acetonitrile the photoexcited MLCT state of dyad 5 transforms into the fullerene triplet excited state with a quantum yield of 0.19 and that, contrary to mononuclear dyad 8 , electron transfer, if any under the applied conditions, is negligible relative to energy transfer.