Diphosphines and pyrazole/pyrazolate-type ligands as building blocks in luminescent Au(I) complexes

María José Mayoral, Paloma Ovejero, Rosario Criado, M. Cristina Lagunas, Aranzazu Pintado-Alba, M. Rosario Torres, Mercedes Cano*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

A series of gold(I) complexes containing diphenylphosphine bridging ligands, dppm, dppe, dpephos, dbfphos and biphep and co-ligands of the type pyrazole have been synthesized. The X-ray crystal structures of [Au 2(μ-dpephos)(μ-pz2CH3)][PF6], [Au 2(μ-dbfphos)(μ-pz2CH3)][PF6], and of the starting compound [Au2Cl2(μ-biphep)] indicate that the structural and stoichiometric characteristics of the new complexes depend on the diphosphine ligand. The three complexes show Au⋯Au contacts between 3.27 and 3.30 , with that of the biphep compound being the shortest. Digold (I)-diphosphine derivatives with a bridging pyrazolate ligand are obtained in all cases, except when [Au2Cl2(μ-biphep)] is used as starting material. Surprisingly, in this case, two monodentate neutral pyrazole ligands are attached to the gold atoms. The new complexes are luminescent in the solid state at 77 K and in solution both at room temperature and 77 K. Low energy emission bands related to the presence of Au⋯Au interactions have been identified in some of the compounds in the solid state and/or in solution.

Original languageEnglish
Pages (from-to)2789-2796
Number of pages8
JournalJournal of organometallic chemistry
Volume696
Issue number15-16
DOIs
Publication statusPublished - 01 Aug 2011

Keywords

  • Aurophilic interactions
  • Gold complexes
  • Luminescent materials
  • Pyrazolate-type ligands
  • Pyrazole-type ligands

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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