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

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

doi:10.1039/c4nj00120f

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

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

Research output: Contribution to journal › Article › peer-review

15 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 language	English
Pages (from-to)	2500-2507
Number of pages	8
Journal	New Journal of Chemistry
Volume	38
Issue number	6
DOIs	https://doi.org/10.1039/c4nj00120f
Publication status	Published - 2014

Keywords

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

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title = "Cobalt(iii) sepulchrate complexes: Application as sustainable oxidative catalysts",

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",

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author = "Susana Ribeiro and Lu{\'i}s Cunha-Silva and Balula, {Salete S.} and Sandra Gago",

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T2 - Application as sustainable oxidative catalysts

AU - Ribeiro, Susana

AU - Cunha-Silva, Luís

AU - Balula, Salete S.

AU - Gago, Sandra

N1 - sem pdf conforme despacho. Fundacao para a Ciencia e a Tecnologia - PEst-C/EQB/LA0006/2011 ; RD project (PTDC/EQU-EQU/121677/2010).

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Y1 - 2014

N2 - 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

AB - 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

KW - CAMBRIDGE STRUCTURAL DATABASE

KW - ELECTRON-TRANSFER

KW - SELECTIVE OXIDATION

KW - IONIC LIQUIDS

KW - CRYSTAL-STRUCTURES

KW - HYDROGEN-PEROXIDE

KW - MOLECULAR-OXYGEN

KW - CAGE COMPLEXES

KW - STYRENE

KW - EPOXIDATION

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VL - 38

SP - 2500

EP - 2507

JO - New Journal of Chemistry

JF - New Journal of Chemistry

IS - 6

ER -

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

Abstract

Keywords

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