Ionic Fluids Containing Both Strongly and Weakly Interacting Ions of the Same Charge Have Unique Ionic and Chemical Environments as a Function of Ion Concentration
H. Wang, S. P. Kelley, J. W. Brantley III, G. Chatel, J. Shamshina, J. F. B. Pereira, V. Debbeti, A. S. Myerson, R. D. Rogers
Liquid multi-ion systems made by combining two or more salts can exhibit charge ordering and interactions not found in the parent salts, leading to new sets of properties. This is investigated herein by examining a liquid comprised of a single cation, 1-ethyl-3-methylimidazolium ([C2mim]+), and two anions with different properties, acetate ([OAc]−) and bis(trifluoromethylsulfonyl)imide ([NTf2]−). NMR and IR spectroscopy indicate that the electrostatic interactions are quite different from those in either [C2mim][OAc] or [C2mim][NTf2]. This is attributed to the ability of [OAc]− to form complexes with the [C2mim]+ ions at greater than 1:1 stoichiometries by drawing [C2mim]+ions away from the less basic [NTf2]− ions. Solubility studies with molecular solvents (ethyl acetate, water) and pharmaceuticals (ibuprofen, diphenhydramine) show nonlinear trends as a function of ion content, which suggests that solubility can be tuned through changes in the ionic compositions.
« Chimie verte: 3 nouveaux articles scientifiques viennent d’être publiés sur l’utilisation des ultrasons en chimie (sonochimie) »
« Green Chemistry: 3 new scientific articles published on the use of ultrasound in chemistry (sonochemistry) »
Our last article selected as Inside Cover in ChemCatChem journal
The inside cover picture shows how the eco-friendly combination of an iron salt as catalyst, aqueous hydrogen peroxide as oxidant, and ultrasound as activation method leads to the selective oxidation of d-glucose into gluconic acid. Indeed, gluconic acid is an attractive target for industry, essentially produced through biotechnological processes. D. Rinsant, G. Chatel, and F. Jérôme demonstrated a sono-Fenton effect and estimated the production of HO⋅ radicals involved in the oxidation reaction. This work is an example of great opportunities that the sonochemical activation can offer in catalysis, involving eco-efficient processes. The article highlighted by this cover can be found on page 3355 (here) of Issue 12, 2014.
Article in « L’Actualité Chimique » about the French Young Chemists’ Network (RJ-SCFà
L’Actualité Chimique is the national journal of the French Chemical Society.
Efficient and Selective Oxidation of D-Glucose into Gluconic acid under Low-Frequency Ultrasonic Irradiation
Damien Rinsant, Gregory Chatel*and François Jérôme
The production of gluconic acid from d-glucose represents an attractive target for industry. In this work, we propose an efficient, eco-friendly, and selective method to oxidize d-glucose with aqueous H2O2 in the presence of FeSO4 as a catalyst. The reaction was improved significantly under ultrasonic (US) activation, which led to excellent yields in only a few minutes. In addition, we determined that the reaction occurred through a sono-Fenton process by studying the production of hydroxyl radicals and optimizing the experimental conditions of the reaction. The energy consumption of the process was also investigated in this study.
Congratulations to Damien for this work performed during his 2014 internship!
G. Chatel* and D. R. MacFarlane
Great collaboration on this article with Doug MacFarlane, from Monash University (Australia)!