Cobalt(iii) sepulchrate complexes: Application as sustainable oxidative catalysts

Susana Ribeiro, Luís Cunha-Silva, Salete S. Balula, Sandra Gago

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The application of cobalt sepulchrate (sep) complexes as active and robust homogeneous catalysts is reported here for the first time, as well as the crystal structure of the [Co(sep)]2(SO4) 3·10H2O compound. The reaction chosen to investigate the catalytic performance of these catalysts was the oxidation of styrene due to the importance of its products in various industrial applications. Sustainable experimental conditions were selected, using H 2O2 as the oxidant and ionic liquids as solvents. A similar catalytic activity was found using complexes containing different anions: [Co(sep)]Cl3 and [Co(sep)]2(SO4) 3. Different kinetic profiles were found using different ionic liquids (1-butyl-3-methylimidazolium hexafluorophosphate or tetrafluoroborate) or acetonitrile as solvents. Complete conversions were achieved after 24 h of reaction. Benzaldehyde was the main product formed and in some cases the only one observed. The homogeneous cobalt catalysts using an ionic liquid as solvent could be recycled for consecutive cycles without significant loss of activity. In addition, the stability of the cobalt sepulchrate complex was confirmed by 1H NMR after catalytic use. This journal is

Original languageEnglish
Pages (from-to)2500-2507
Number of pages8
JournalNew Journal of Chemistry
Volume38
Issue number6
DOIs
Publication statusPublished - 2014

Keywords

  • CAMBRIDGE STRUCTURAL DATABASE
  • ELECTRON-TRANSFER
  • SELECTIVE OXIDATION
  • IONIC LIQUIDS
  • CRYSTAL-STRUCTURES
  • HYDROGEN-PEROXIDE
  • MOLECULAR-OXYGEN
  • CAGE COMPLEXES
  • STYRENE
  • EPOXIDATION

Fingerprint

Dive into the research topics of 'Cobalt(iii) sepulchrate complexes: Application as sustainable oxidative catalysts'. Together they form a unique fingerprint.

Cite this