Synthesis and characterisation of new pyrazole-phosphinite ligands and their ruthenium(II) arene complexes

Rosa Tribó, Sergi Muñoz, Josefina Pons, Ramón Yáñez, Ángel Álvarez-Larena, Joan Francesc Piniella, Josep Ros

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Abstract

The new potentially bidentate pyrazole-phosphinite ligands [(3,5-dimethyl-1H-pyrazol-1-yl)methyl diphenylphosphinite] (L1) and [2-(3,5-dimethyl-1H-pyrazol-1-yl)ethyl diphenylphosphinite] (L2) were synthesised and characterised. The reaction of L1 and L2 with the dimeric complexes [Ru(η6-arene)Cl2] 2 (arene = p-cymene, benzene) led to the formation of neutral complexes [Ru(η6-arene)Cl2(L)] (L = L1, L2) where the pyrazole-phosphinite ligand is κ1-P coordinated to the metal. The subsequent reaction of these complexes with NaBPh4 or NaBF4 produced the [Ru(η6-p- cymene)Cl(L2)][BPh4] and [Ru(η6-benzene) Cl(L2)][BF4] compounds which contain the pyrazole-phosphinite ligand κ2-P,N bonded to ruthenium. All the complexes were fully characterised by analytical and spectroscopic methods. The structure of the complex [Ru(η6-p-cymene)Cl(L 2)][BPh4] was also determined by a X-ray single crystal diffraction study. © 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)4072-4079
JournalJournal of Organometallic Chemistry
Volume690
Issue number17
DOIs
Publication statusPublished - 1 Sep 2005

Keywords

  • Arene ruthenium(II) complexes
  • Phosphinite
  • Pyrazole
  • X-ray structure

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