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Reactivity studies of cyclopentadienyl ruthenium(II), osmium(II) and pentamethylcyclopentadienyl iridium(III) complexes towards 2-(2′-pyridyl)imidazole derivatives
Auteur(s)
Pachhunga, Khenglawt
Kreisel, Kevin A.
Yap, Glenn P.A.
Kollipar, Mohan Rao
Date de parution
2007
In
Polyhedron, Elsevier, 2007/26/14/3638-3644
Résumé
The reaction of [CpRu(PPh<sub>3</sub>)<sub>2</sub>Cl] and [CpOs(PPh<sub>3</sub>)<sub>2</sub>Br] with chelating 2-(2′-pyridyl)imidazole (N ∩ N) ligands and NH<sub>4</sub>PF<sub>6</sub> yields cationic complexes of the type [CpM(N ∩ N)(PPh<sub>3</sub>)] <sup>+ </sup> (<b>1</b>: M = Ru, N ∩ N = 2-(2′-pyridyl)imidazole; <b>2</b>: M = Ru, N ∩ N = 2-(2′-pyridyl)benzimidazole; <b>3</b>: M = Ru, N ∩ N = 2-(2′-pyridyl)-4,5-dimethylimidazole; <b>4</b>: M = Ru, N ∩ N = 2-(2′-pyridyl)-4,5-diphenylimidazole; <b>5</b>: M = Os, N ∩ N = 2-(2′-pyridyl)imidazole; <b>6</b>: M = Os, N ∩ N = 2-(2′-pyridyl)benzimidazole). They have been isolated and characterized as their hexafluorophosphate salts. Similarly, in the presence of NH4PF6, [Cp*Ir(μ-Cl)Cl]<sub>2</sub> reacts in dry methanol with N ∩ N chelating ligands to afford in excellent yield [Cp*Ir(N ∩ N)Cl]PF<sub>6</sub> (<b>7</b>: N ∩ N = 2-(2′-pyridyl)imidazole; <b>8</b>: N ∩ N = 2-(2′-pyridyl)benzimidazole). All the compounds have been characterized by infrared and NMR spectroscopy and the molecular structure of [<b>1</b>]PF<sub>6</sub>, [<b>2</b>]PF<sub>6</sub> and [<b>7</b>]PF<sub>6</sub> by single-crystal X-ray structure analysis.
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Type de publication
journal article
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