A Case of Self-Organization in Highly Emissive EuIII Ionic Liquids

João P. Leal, Mani Outis, Maria H. Casimiro, Luis M. Ferreira, Fábio Fernandes, Bernardo Monteiro, César A. T. Laia, Cláudia C.L. Pereira

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4 Citations (Scopus)

Abstract

Intrinsic photoluminescent ionic liquids based on europium(III) tetrakis(β-diketonate) complexes with a tetraalkylphosphonium as the counterion were synthesized. Two are room temperature ionic liquids; [P6,6,6,14][Eu(fod)4] (1) {fod is 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyloctane-4,6-dionate} and [P6,6,6,14][Eu(fod)3(dbm)] (2) {dbm is dibenzoylmethanate}, while calorimetric measurements showed a melting point at 415 K for [P6,6,6,14][Eu(dbm)4] (3). The luminescence quantum yields determined for 1, 2, and 3 are 34, 59 %, and 64 %, respectively. The photoluminescence and thermochemical properties of the complexes were investigated in detail and the influence of the long chain tetraalkylphosphonium counterion, together with the aromatic diketone ligand, on the unusual thermal behavior of 2 is discussed.

Original languageEnglish
Pages (from-to)3429-3434
Number of pages6
JournalEuropean Journal of Inorganic Chemistry
Volume2017
Issue number28
DOIs
Publication statusPublished - 2017

Keywords

  • Europium
  • Ionic liquids
  • Photochemistry
  • Thermochemistry
  • Trihexyltetradecylphosphonium

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