Palladium(II) and platinum(II) complexes with N1-hydroxyethyl-3,5-pyrazole derived ligands

José A. Perez, Vanessa Montoya, José A. Ayllon, Mercè Font-Bardia, Teresa Calvet, Josefina Pons

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17 Citations (Scopus)

Abstract

Reaction of the ligands 2-(5-methyl-3-phenyl-1H-pyrazol-1-yl)ethanol (L1) and 2-(3-methyl-5-phenyl-1H-pyrazol-1-yl)ethanol (L2) with [MCl 2(CH 3CN) 2] (M = Pd(II), Pt(II)) gave the complexes trans-[MCl 2L 2] (M = Pd(II) and Pt(II), L = L1, L2). The new complexes were characterised by elemental analyses, conductivity measurements, mass spectrometry, IR, 1H and 13C{ 1H} NMR spectroscopies. The crystal and molecular structures of the ligand L2 and the complexes trans-[PdCl 2L 2] (L = L1, L2) were resolved by X-ray diffraction. Both palladium complexes consisted on monomeric trans-[PdCl 2L 2] (L = L1, L2) species and molecular packing is determined by intermolecular hydrogen bonding interactions. The NMR spectra of the complexes [PdCl 2L 2] (L = L1, L2) in CDCl 3 solution, is consistent with a very slow rotation of the pyrazolic ligands around the Pd-N bond, so that two conformational isomers can be observed in solution (syn and anti). Different behaviour was observed for complexes [PtCl 2L 2] (L = L1, L2), for which only the anti isomer was detected in CDCl 3 solution at room temperature. © 2012 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)21-30
JournalInorganica Chimica Acta
Volume394
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

  • Crystal structures
  • N-Hydroxyalkylphenylpyrazole
  • Palladium(II)
  • Platinum(II)
  • Regioisomers

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