Study of the bonding properties of the bis[2-(3,5-dimethyl-1-pyrazolyl) ethyl]ether toward Rh(I): An hemilabile ligand exhibiting κ3N,N,O meridional or facial coordination mode

Anna Boixassa, Josefina Pons, Josep Ros, René Mathieu, Noël Lugan

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18 Citations (Scopus)

Abstract

The bis[2-(3,5-dimethyl-1-pyrazolyl)ethyl]ether ligand (L1) reacts with [Rh(COD)(THF)2][BF4] generated in situ, giving [Rh(COD)(L1-κ2N,N)] [BF4] ([1][BF4]). The 1,5-cyclooctadiene ligand is displaced by carbon monoxide to generate [Rh(CO)2(L1)][BF4] ([2][BF4]) in which in the solid state, the ligand L1 adopts a facial κ3N,N,O bonding mode. This is the first example of such a coordination mode for this ligand, which generally prefers a 'T-shaped' meridional bonding mode. In solution [2][BF4] exists as a mixture of two isomers in rapid equilibrium on the NMR time scale, [Rh(CO)2 (L1-κ2N,N)]+ ([2a]+) and the major compound [Rh(CO)2(L1-κ 3N,N,O)]+[2b]+. [2][BF4] looses easily one molecule of carbon monoxide at room temperature leading to [Rh(CO)(L1-κ3N,N,O)] [BF4] ([3][BF4]) in which L1 adopts a 'T-shaped' meridional bonding mode. Carbon monoxide addition in solution regenerates rapidly [2][BF4]. The single-crystal X-ray structures of [1][BF4], [2b][BF4] and [3][BF4] are reported. © 2003 Elsevier B.V. All reserved.
Original languageEnglish
Pages (from-to)233-239
JournalJournal of Organometallic Chemistry
Volume682
Issue number1-2
DOIs
Publication statusPublished - 1 Oct 2003

Keywords

  • Ether-pyrazole ligand
  • Hemilabile ligand
  • Rhodium(I) complexes
  • Tridentate ligand

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