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Mono and dinuclear arene ruthenium complexes containing 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline as chelating ligand: Synthesis and molecular structure
Auteur(s)
Govindaswamy, Padavattan
Saïd-Mohamed, Cynthia
Date de parution
2007
In
Polyhedron, Elsevier, 2007/26/15/4065-4072
Résumé
The mononuclear cations of the general formula [(η<sup>6</sup>-arene)RuCl(dpqMe<sub>2</sub>)]<sup>+</sup> (dpqMe<sub>2</sub> = 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline; arene = C<sub>6</sub>H<sub>6</sub>, <b>1</b>; C<sub>6</sub>H<sub>5</sub>Me, <b>2</b>; <i>p</i>-Pr<i><sup>i</sup></i>C<sub>6</sub>H<sub>4</sub>Me, <b>3</b>; C<sub>6</sub>Me<sub>6</sub>, <b>4</b>) as well as the dinuclear dications [(η<sup>6</sup>-arene) <sub>2</sub>Ru<sub>2</sub>Cl<sub>2</sub>(μ-dpqMe<sub>2</sub>)]<sup>2+</sup> (arene = C<sub>6</sub>H<sub>6</sub>, <b>5</b>; C<sub>6</sub>H<sub>5</sub>Me, <b>6</b>; <i>p</i>-Pr<i><sup>i</sup></i>C<sub>6</sub>H<sub>4</sub>Me, <b>7</b>; C<sub>6</sub>Me<sub>6</sub>, <b>8</b>) have been synthesised from 6,7-dimethyl-2,3-di(pyridine-2-yl)quinoxaline (dpqMe<sub>2</sub>) and the corresponding chloro complexes [(η<sup>6</sup>-C<sub>6</sub>H<sub>6</sub>)Ru(μ-Cl)Cl]<sup>2</sup>, [(η<sup>6</sup>-C<sub>6</sub>H<sub>5</sub>Me)Ru(μ-Cl)Cl]<sub>2</sub>, [(η<sup>6</sup>-<i>p</i>-Pr<i><sup>i</sup></i>C<sub>6</sub>H<sub>4</sub>Me)Ru(μ-Cl)Cl]<sub>2</sub> and [(η<sup>6</sup>-C<sub>6</sub>Me<sub>6</sub>)Ru(μ-Cl)Cl]<sub>2</sub>, respectively. The X-ray crystal structure analyses of [<b>1</b>][PF<sub>6</sub>], [<b>3</b>][PF<sub>6</sub>] and [<b>6</b>][PF<sub>6</sub>]2 reveal a typical piano-stool geometry around the metal centre; in the dinuclear complexes the two chloro ligands, with respect to each other, are found to be trans oriented.
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journal article
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