Versatile Polyoxometalates of Different Structural Dimensionalities for Liquid Phase Catalytic Oxidation

Ionic polymolybdate compounds (IPOM) possessing the anions [Mo8O26]4− and [Mo3O10]2−, and cyclohexylammonium (Cy6N) or anilinium (Anil) as organic cations, namely cyclohexylammonium β-octamolybdate dihydrate (1), cyclohexylammonium trimolybdate hydrate (2), anilinium β-octamolybdate dihydrate (3), a...

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Bibliographic Details
Published in:Catalysts 2024-04, Vol.14 (4), p.251
Main Authors: Neves, Patrícia, Simões, Guilherme, Napruszewska, Bogna D, Pamin, Katarzyna, Serda, Paweł, Łasocha, Wieslaw, Valente, Anabela A
Format: Article
Language:English
Subjects:
Alkenes
Analysis
Atomic properties
Catalytic oxidation
Crystals
Epoxidation
Esters
Liquid phases
Metal ions
Methods
Molybdenum
Molybdenum compounds
Oxidation
Oxidation-reduction reaction
Oxidizing agents
Polymers
Polyoxometallates
Properties
Structure
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Summary:Ionic polymolybdate compounds (IPOM) possessing the anions [Mo8O26]4− and [Mo3O10]2−, and cyclohexylammonium (Cy6N) or anilinium (Anil) as organic cations, namely cyclohexylammonium β-octamolybdate dihydrate (1), cyclohexylammonium trimolybdate hydrate (2), anilinium β-octamolybdate dihydrate (3), anilinium trimolybdate tetrahydrate (4) and anilinium trimolybdate dihydrate (5), were synthesized via simple, eco-friendly one-pot routes. New crystal structures of 1, 2 and 5 were discovered. IPOM compounds with different structural dimensionality, density and ratio of the number of terminal oxo groups/molybdenum atoms (n(oxo)/Mo) were developed. The IPOM compounds promoted the epoxidation of biobased olefins such as the fatty acid methyl esters methyl oleate and methyl linoleate with tert-butylhydroperoxide as oxidant, leading to conversions of at least 81% at 4 h, 70 °C and the corresponding epoxides. The reaction scope of applications for the IPOM catalysts covered cyclooctane oxidation.
ISSN:2073-4344
2073-4344
DOI:10.3390/catal14040251