| Autor: |
Maiouf, Fatma-Zohra, Boumechhour, Abdenour, Benadji, Siham, Dermeche, Leila, Mazari, Tassadit, Lancelot, Christine, Rabia, Chérifa |
| Jazyk: |
English<br />French |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Comptes Rendus. Chimie, Vol 25, Iss G1, Pp 253-266 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1878-1543 |
| DOI: |
10.5802/crchim.195 |
| Popis: |
In this work, a series of polyoxometalates (POMs), as soluble salts of formula Sn1.5PMo12O40, SbPMo12O40 and $\mathrm{H}_{3-x}\mathrm{Sn}_{x1}\mathrm{Sb}_{x2}\mathrm{PMo}_{12} \mathrm{O}_{40}$ ($x=2x_{1}+3x_{2}$ and $x_{1}$, $x_{2}=$ 0–0.75) were synthesized using the cationic exchange method under stoichiometric conditions. They were characterized and tested in the oxidation of cyclohexanone using hydrogen peroxide in the absence of organic solvent, co-catalyst phase transfer compounds or surfactants. UV–Visible and X-ray photoelectron spectroscopic analyses showed a partially reduced state of POM with coexistence of the couples Mo(VI)/Mo(V), Sb(V)/Sb(III) and Sn(IV)/Sn(II), without affecting their structure, results confirmed by FT-IR and Raman spectroscopies. The reversible cyclic voltammetry analysis evidenced the valence change of the Mo species, Mo(VI)/Mo(V). The POMs are found to be active in the cyclohexanone oxidation reaction and among them the most efficient is $\mathrm{H}_{0.75}\mathrm{Sb}_{0.75}\mathrm{PMo}_{12}\mathrm{O}_{40}$ with 49% of adipic acid yield. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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