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A Triad Based on an Iridium( III ) Bisterpyridine Complex Leading to a Charge‐Separated State with a 120‐μs Lifetime at Room Temperature
Author(s) -
Flamigni Lucia,
Baranoff Etienne,
Collin JeanPaul,
Sauvage JeanPierre
Publication year - 2006
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.200600002
Subject(s) - iridium , triad (sociology) , charge (physics) , state (computer science) , materials science , chemistry , physics , computer science , psychology , quantum mechanics , psychoanalysis , catalysis , algorithm , biochemistry
A triad D ‐ Ir ‐ A , where Ir is an Ir III bisterpyridine complex connected through an amidophenyl spacer to D, a triphenylamine electron donor, and to A, a naphthalene bisimide electron acceptor, has been synthesized and electrochemically investigated. The photoinduced processes in the triad, which is more than 4‐nm long, have been characterized by steady‐state and time‐resolved optical spectroscopy by comparison with the model dyads D ‐ Ir , Ir ‐ A , and the reference monomers D , Ir , and A . A sequential electron transfer occurs upon excitation of the D and Ir units, leading to the charge‐separated state D + ‐Ir − ‐A in 100 % yield and subsequently to D + ‐Ir‐A − in about 10 % yield. The final charge‐separated state has a lifetime at room temperature of 120 μs in air‐free acetonitrile and of 100 μs in air‐equilibrated solvent. Excitation of the A units does not yield intramolecular reactivity, but the resulting triplet‐excited state localized on the acceptor, D‐Ir‐ 3 A, displays intermolecular reactivity.