Chelate and bridge diphosphine isomerization: triosmium and triruthenium clusters containing 1,1-bis(diphenylphosphino)ferrocene (dppf)

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Abstract

The coordination mode of dppf {dppf = 1,1'-bis(diphenylphosphino)ferrocene} at triosmium and triruthenium carbonyl clusters has been studied. Heating [Os3(CO)12] with dppf in the presence of Me3NO in benzene at 60 C furnishes three triosmium compounds, [Os3(CO)11(1-dppf)] (1), [Os3(CO)10(2-dppf)] (2), and [Os3(CO)10(-dppf)] (3) in 10, 20, and 30% yields, respectively. Reaction of the labile cluster [Os3(CO)10(MeCN)2] with dppf at room temperature also gives 1, 2, and 3 (5, 10, and 35% yields). Treatment of 1, which contains a pendant diphosphine, with Me3NO at room temperature affords 2 via a ring closure reaction, whereas heating 2, in which the dppf ligand is chelating, at 110 C affords the thermodynamically stable bridging isomer 3, in which phosphorus atoms are bound at equatorial positions. Reaction of the unsaturated cluster [Os3(CO)10(-H)2] (4) with dppf in refluxing THF affords the bridging complex [Os3(CO)8(-dppf)(-H)2] (6) in high yield as the sole product. Hydrogenation of 3 with H2 at 110 C at 1 atm also yields 6. Reactions of both the saturated [Os3(CO)10(-dppm)] (7) and electron-deficient [Os3(CO)8{3-Ph2PCH2P(Ph)C6H4}(-H)] (8) with dppf at 110 C and at room temperature respectively yield [Os3(CO)9(-dppm)(1-dppf)] (9) and [Os3(CO)8(-dppm)(2-dppf)] (10). Compound 9 converts to 10 at 110 C via CO loss and phosphorus coordination. Reaction of [Ru3(CO)12] with dppf in the presence of Me3NO affords the dihydroxy-bridged complex, [Ru3(CO)8(-dppf)(-OH)2] (13), together with the previously reported compounds [Ru3(CO)10(-dppf)] (11) and [Ru3(CO)8(-dppf)2] (12).

Details

Authors
  • Noorjahan Begum
  • Uttam Kumar Das
  • H Manzur
  • Graeme Hogarth
  • Shariff Enamul Kabir
  • Ebbe Nordlander
  • Derek Tocher
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)6462-6472
JournalOrganometallics
Volume26
Issue number25
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes

Bibliographic note

The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)