Bis[(3,5-dimethyl-1-pyrazolyl)methyl]ethylamine - A versatile ligand for complexation in RhI cationic complexes

René Mathieu, Gloria Esquius, Noël Lugan, Josefina Pons, Josep Ros

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49 Citations (Scopus)


The bis[(3,5-dimethyl-1-pyrazolyl)methyl]ethylamine ligand (1) reacts with [Rh(COD)(THF)2][BF4] leading to [Rh(COD)(1)][BF4] ([2][BF4]) in which 1 is κ3 bonded in the solid state. Because of the steric bulk of 1,5-cyclooctadiene, it prefers the κ2 mode of bonding in solution. Substitution of 1,5-cyclooctadiene by carbon monoxide generates [3][BF4] in which 1 is κ3 bonded in solution and solid state. Variable temperature NMR spectroscopic studies give evidence of a κ3 ⇄ κ2 equilibrium in solution. [3][BF4] is easily decarbonylated to [Rh(CO)(1)][BF4] [4][BF4] in which 1 is κ3 bonded; however on bubbling carbon monoxide through, [3][BF4] is regenerated. The single-crystal X-ray structures of [2][BF4], [3][BPh4], and [4][BPh4] are reported.
Original languageEnglish
Pages (from-to)2683-2688
JournalEuropean Journal of Inorganic Chemistry
Issue number10
Publication statusPublished - 17 Oct 2001


  • Aminopyrazole
  • Cationic complexes
  • Hemilabile ligands
  • Rhodium


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