Ionic Liquids Based on Oxidoperoxido-Molybdenum(VI) Complexes with a Chelating Picolinate Ligand for Catalytic Epoxidation

Zeljko Petrovski, Margarida M. Antunes, Ana Soraia de Oliveira Mendo, Luís Cabrita, Isabel S. Gonçalves, Anabela A. Valente, Luís Alexandre Almeida Fernandes Cobra Branco

Research output: Contribution to journalArticle

Abstract

Ionic oxidoperoxido-molybdenum(VI) complexes of the type [Cat][MoO(O2)2(pic)], with pic = N,O-chelated picolinate ligand and Cat = monocation, were prepared in high yields (82–95%) from the precursor complex [H3O][MoO(O2)2(pic)] via [H]+ cation exchange for 1-ethyl-3-methylimidazolium [EMIM]+, 1-butyl-3-methylimidazolium [BMIM]+, 1-octyl-3-methylimidazolium [OMIM]+, N-cetylpyridinium [C16Py]+, and N-methyl-N,N,N-trioctylammonium [Aliquat]+. The structure and purity of the ionic compounds were assessed by 1H and 13C NMR, FT-IR, and elemental analysis (C, H, N), and the electrochemical properties were studied by differential pulse voltammetry (DPV) and cyclic voltammetry (CV). The [Cat][MoO(O2)2(pic)] compounds showed promising catalytic epoxidation activity based on the model reaction of cis-cyclooctene with tert-butyl hydroperoxide as oxidant. The type of cation influenced the physical state of the compound and the catalytic performance.
Original languageEnglish
Pages (from-to)147-161
JournalReactions
Volume1
Issue number2
DOIs
Publication statusPublished - 2 Dec 2020

Keywords

  • ionic liquid complexes
  • oxidoperoxidomolybdenum
  • picolinate
  • catalysis
  • epoxidation

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