The synthesis and characterisation of bis(phosphane)-linked (eta(6)-p-cymene)ruthenium(II)-borane compounds

The reaction of [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>]<sub>2</sub> with some bis(phosphane) ligands (dppm, dppe, dppv, dppa, dpp14b, dppf) has been investigated. In general mixtures of products were obtained, although the pendant phosphane complexes [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(η<sup>1</sup>-dppv)] and [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(η<sup>1</sup>-dppa)] were isolated and characterized in the solid state by X-ray diffraction. The later complex was obtained in lower yield and undergoes an equilibration reaction resulting in the formation of a dimeric species, where the dppa bridges two ruthenium centres, and uncoordinated phosphane; the bridging species was also structurally characterised in the solid state. In contrast, the reaction of [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(PPh<sub>3</sub>)] with dppa in the presence of [NH<sub>4</sub>]PF<sub>6</sub> results in the formation of [(η<sup>6</sup>-p-cymene)RuCl(PPh<sub>3</sub>)(η<sup>1</sup>-dppa)]PF<sub>6</sub>, which is stable in solution. A series of linked ruthenium-borane complexes, viz. [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(η<sup>1</sup>-phosphane-BH<sub>3</sub>)] (phosphane = dppm, dppe, dppv, dppa, dpp14b, dppf) and [(η<sup>6</sup>-p-cymene)RuCl(PPh<sub>3</sub>)(η<sup>1</sup>-dppa-BH<sub>3</sub>)]PF<sub>6</sub> have been prepared from isolated pendant phosphane complexes, those generated in situ, or from a preformed phosphane-borane adduct. The solid-state structures of [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(η<sup>1</sup>-dppm-BH<sub>3</sub>)], [(η<sup>6</sup>-p-cymene)RuCl<sub>2</sub>(η<sup>1</sup>-dppe-BH<sub>3</sub>)] and [(η<sup>6</sup>-p-Cymene)RuCl<sub>2</sub>(η<sup>1</sup>-dppv-BH<sub>3</sub>)] have been determined by X-ray diffraction analysis.


Published in:
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, 23, 4762-4774
Year:
2005
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 Record created 2006-02-13, last modified 2018-03-17


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