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New Polypyridine Ligands Functionalized with Redox-Active Fe(II) Organometallic Fragments

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posted on 29.10.2007, 00:00 by Frédéric Paul, Sébastien Goeb, Frédéric Justaud, Gilles Argouarch, Loic Toupet, Raymond F. Ziessel, Claude Lapinte
We report in this Communication the isolation and characterization, including structure determinations, of 2,2‘,6‘,2‘ ‘-terpyridine (2) and 2,2‘-bipyridine (3) ligands bearing two redox-active “(η2-dppe)(η5-C5Me5)FeC⋮C−” moieties grafted to the 5 and 5‘ ‘ positions of terpy or to the 5 and 5‘ positions of bipy. These “metalloligands” have been complexed with Ru(II) and Mo(0), providing new heterotrinuclear complexes displaying intense absorptions around 700 and 600 nm, respectively, for the Fe2Ru/terpy and Fe2Mo/bipy species. In both cases, the Fe(II)/Fe(III) oxidation potentials of the free ligands became more positive by more than 50 mV upon complexation.