The (phosphino)tetraphenylborate ligand in ruthenium-arene chemistry |
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Authors: | Michael T. Beach Timothy G. Larocque Ruiyao Wang |
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Affiliation: | a Department of Chemistry, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1 b Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6 |
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Abstract: | The synthesis of a series of anionic half-sandwich ruthenium-arene complexes [E][RuCl2(η6-p-cymene){PR2(p-Ph3BC6H4)}] (E = Bu4N+: R = Ph, 1a, iPr, 1b or Cy, 1c; E = bis(triphenylphosphine)iminium or PNP+: R = Ph, 1a′, iPr, 1b′ or Cy, 1c′) are reported. X-ray crystallographic studies of 1a′ and 1b′ confirmed the three-legged piano-stool coordination geometry. In solution, complexes 1a-c and 1a′-c′ are proposed to form monomer-dimer equilibria as a result of chloride ligand dissociation. Complexes 1a-c and 1a′-c′ also form the formally neutral zwitterionic complexes [RuCl(L)(η6-p-cymene){PR2(p-Ph3BC6H4)}] (L = pyridine: R = Ph, 2a, iPr, 2b or Cy, 2c; L = MeCN: R = Ph, 3a, iPr, 3b or Cy, 3c) via chloride ligand abstraction using AgNO3 or MeOTf. |
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Keywords: | Ruthenium Zwitterionic Arene Half-sandwich (Phosphino)tetraphenylborate Anionic phosphine |
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