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Designing the Host-Guest Properties of Tetranuclear Arene Ruthenium Metalla-Rectangles to Accommodate a Pyrene Molecule
Auteur(s)
Barry, Nicolas P. E.
Furrer, Julien
Date de parution
2010
In
European Journal of Inorganic Chemistry, Wiley, 2010/5//725-728
Résumé
Cationic tetranuclear arene ruthenium complexes of the general formula [Ru<sub>4</sub>(<i>p</i>-cymene)<sub>4</sub>(<i>N</i>∩<i>N</i>)<sub>2</sub>(dhnq)<sub>2</sub>]<sup>4+</sup> comprising rectangular structures are obtained in methanol from the reaction of the dinuclear arene ruthenium precursor [Ru<sub>2</sub>(<i>p</i>-cymene)<sub>2</sub>(dhnq)<sub>2</sub>Cl<sub>2</sub>] (dhnq = 5,8-dihydroxy-1,4-naphthoquinonato) with pyrazine or bipyridine linkers [<i>N</i>∩<i>N</i> = pyrazine, <b>1</b>; 4,4-bipyridine, <b>2</b>; 1,2-bis(4-pyridyl)ethylene, <b>3</b>] in the presence of AgCF<sub>3</sub>SO<sub>3</sub>. All complexes <b>1-3</b>, isolated in good yield as triflate salts, have been characterised by NMR and IR spectroscopy. The interaction of these rectangular complexes with pyrene as a guest molecule has been studied in solution by various NMR techniques (1D, DOSY, ROESY). In [D<sub>3</sub>]acetonitrile, the pyrazine-containing metalla-rectangle <b>1</b> shows no meaningful interactions with pyrene. On the other hand, the 4,4-bipyridine- and 1,2-bis(4-pyridyl)ethylene-containing metalla-rectangles <b>2</b> and <b>3</b> clearly interact with pyrene in [D<sub>3</sub>]acetonitrile. DOSY measurements suggest that, in the case of [Ru<sub>4</sub><i>p</i>-cymene)<sub>4</sub>(4,4-bipyridine)<sub>2</sub>(dhnq)<sub>2</sub>]<sup>4+</sup> (<b>2</b>), the interactions occur on the outside of the rectangular assembly, while in the case of [Ru<sub>4</sub>(<i>p</i>-cymene)<sub>4</sub>{1,2-bis(4-pyridyl)ethylene}<sub>2</sub> (dhnq)<sub>2</sub>]<sup>4+</sup> (<b>3</b>), the pyrene molecule is found inside the hydrophobic cavity of the metalla-rectangle, thus giving rise to a host-guest system.
Identifiants
Type de publication
journal article
