authors |
Nogueira, LS; Antunes, MM; Gomes, AC; Cunha-Silva, L; Pillinger, M; Lopes, AD; Valente, AA; Goncalves, IS |
nationality |
International |
journal |
DALTON TRANSACTIONS |
keywords |
CAMBRIDGE STRUCTURAL DATABASE; OXO-MOLYBDENUM COMPLEXES; CRYSTAL-STRUCTURES; EFFICIENT CATALYSTS; OXIDATION; COORDINATION; CUCURBITURIL; CYCLOHEXENE; STYRENE; EPOXIDATION |
abstract |
The reaction of the macrocyclic cavitand cucurbit[6]uril (CB[6]) and the diaqua complex [MoO2Cl2(H2O)(2)] in hydrochloric acid solution gave a water insoluble supramolecular compound with the general composition 2[MoO2Cl2(H2O)(2)]center dot CB[6]center dot xH(2)O center dot yHCl center dot z(CH3COCH3) (2). Single crystal X-ray diffraction (XRD) analysis revealed the presence of barrel-shape supramolecular entities, {CB[6]center dot 10(H2O)}, aligned in layers which are shifted relative to adjacent layers to form a brick-like pattern. The CB[6]/water hydrogen-bonded entities further engage in intermolecular interactions with water, HCl and [MoO2Cl2(H2O)(2)] molecules to form a three-dimensional (3D) framework. Compound 2 was characterised by thermogravimetric analysis (TGA), IR and Raman vibrational spectroscopy, and C-13{H-1} CP MAS NMR. The reference complex [MoO2Cl2(H2O)(2)]center dot(diglyme)(2) (1) and compound 2 were studied for the oxidative catalytic conversion of olefins (cis-cyclooctene, cyclohexene and styrene) with aqueous H2O2 as oxidant. Using alcohols as solvents, 2 was employed in a one-pot two-stage strategy for converting olefins to alkoxy products, which involves oxidation (with H2O2) and acid chemistry. Mechanistic studies were carried out using different intermediates as substrates, and the type of solvent and substrate scope were investigated. The results demonstrated the ability of the CB[6]/Mo-VI supramolecular adduct to function as an acid-oxidation multifunctional catalyst, and its recovery and reuse via relatively simple procedures. |
publisher |
ROYAL SOC CHEMISTRY |
issn |
1477-9226 |
isbn |
1477-9234 |
year published |
2019 |
volume |
48 |
issue |
30 |
beginning page |
11508 |
ending page |
11519 |
digital object identifier (doi) |
10.1039/c9dt02127b |
web of science category |
Chemistry, Inorganic & Nuclear |
subject category |
Chemistry |
unique article identifier |
WOS:000477957200032
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
4.174 |
5 year journal impact factor |
3.812 |
category normalized journal impact factor percentile |
90 |
dimensions (citation analysis):
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altmetrics (social interaction):
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