authors |
Amarante, TR; Neves, P; Paz, FAA; Gomes, AC; Pillinger, M; Valente, AA; Goncalves, IS |
nationality |
International |
journal |
CATALYSIS SCIENCE & TECHNOLOGY |
keywords |
COMPLEXES; EPOXIDATION |
abstract |
The discovery of selective heterogeneous catalytic systems for industrial oxidation processes remains a challenge. Molybdenum oxide-based polymeric hybrid materials have been shown to be oxidation catalysts under mild reaction conditions, although difficulties remain with catalyst recovery/reuse since most perform as homogeneous catalysts or possess low activity. The present study shows that the hybrid material [MoO3(2,2 '-biimidazole)]center dot H2O (1) is a superior catalyst regarding these issues. The structure of 1 was confirmed (by single crystal and synchrotron X-ray powder diffraction) to comprise one-dimensional chains of corner-sharing {MoO4N2} octahedra. Strong Mo = OMIDLINE HORIZONTAL ELLIPSISH-N hydrogen bonds separate adjacent chains to afford parallel channels that are occupied by disordered water molecules. Hybrid 1 was additionally characterised by FT-IR spectroscopy, H-1 and C-13 MAS NMR, scanning electron microscopy and thermogravimetric analysis. The catalytic studies highlighted the versatility of 1 for oxidation reactions with tert-butylhydroperoxide as oxidant. By complementing with characterisation studies, it was verified that the reaction occurs in the heterogeneous phase, the catalyst has good stability and is recoverable via simple procedures. The chemical reaction scope covered epoxidation and sulfoxidation, and the substrate scope included biomass-derived dl-limonene and fatty acid methyl esters to give renewable bio-products, as well as thiophene and thioanisole substrates. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
2044-4753 |
isbn |
2044-4761 |
year published |
2021 |
volume |
11 |
issue |
6 |
beginning page |
2214 |
ending page |
2228 |
digital object identifier (doi) |
10.1039/d1cy00055a |
web of science category |
15 |
subject category |
Chemistry, Physical |
unique article identifier |
WOS:000634519900017
|
ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
5.721 |
5 year journal impact factor |
5.863 |
category normalized journal impact factor percentile |
74.528 |
dimensions (citation analysis):
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altmetrics (social interaction):
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