Sommaire / Contents
Publication date: October 2018Source: Comptes Rendus Chimie, Volume 21, Issue 10Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - October 19, 2018 Category: Chemistry Source Type: research
Magnetic nanoparticle coated with ionic organic networks: A robust catalyst for Knoevenagel condensation
Publication date: Available online 17 October 2018Source: Comptes Rendus ChimieAuthor(s): Nasim Kakesh, Soheil Sayyahi, Rashid BadriAbstractNovel poly(ionic liquid) coated magnetic nanoparticles (Fe3O4–PIL) were synthesized for the first time and fully characterized by transmission electron microscopy, field-emission scanning electron microscopy, energy-dispersive X-ray, thermogravimetric–differential thermal gravimetric (DTG), Fourier transform infrared, and vibrating sample magnetometry (VSM) techniques. Then, the catalytic efficiency of Fe3O4–PIL was investigated in Knoevenagel condensations of various aldehydes w...
Source: Comptes Rendus Chimie - October 19, 2018 Category: Chemistry Source Type: research
Excited state transformations of heterostilbenes: Pathways to polycyclic skeleta
Publication date: Available online 15 October 2018Source: Comptes Rendus ChimieAuthor(s): Ivana Šagud, Irena Škorić, Marija Šindler-KulykAbstractFor the past 40 years M. Šindler-Kulyk's group has been studying, among other things, excited state reactivity of various heteroaromatic analogues of o-vinylstilbenes, o-vinylstyryl- and o-phenylenedivinylene-aromatic heterocycles, simply called o-vinyl-heterostilbenes and di-heterostilbenes. A concise overview of this vast research is presented. To date furan, pyrrole, sydnone, thiophene, oxazole, and most lately pyridine nuclei were incorporated into the basic stilbene-type...
Source: Comptes Rendus Chimie - October 16, 2018 Category: Chemistry Source Type: research
The importance of specific solvent–solute interactions for studying UV–vis spectra of light-responsive molecular switches
Publication date: Available online 13 October 2018Source: Comptes Rendus ChimieAuthor(s): Dušan DimićAbstractShort-range interactions between solvents and molecular switches influence their structure, electronic transitions, and stability. The explicit solvent interactions between water and N′-[1-(2-hydroxyphenyl)ethyliden]isonicotinoyl hydrazone, as a representative of the light-responsive molecule, were investigated by quantum chemical techniques, density functional theory, natural bond orbital, and quantum theory of atoms in molecules. On the basis of the preliminary spectra obtained with the polarizable continuum s...
Source: Comptes Rendus Chimie - October 14, 2018 Category: Chemistry Source Type: research
Insight into surface and structural changes of montmorillonite and organomontmorillonites loaded with Ag
Publication date: Available online 11 October 2018Source: Comptes Rendus ChimieAuthor(s): Alejandra M. Fernández Solarte, Jhonny Villarroel-Rocha, César Fernández Morantes, Maria L. Montes, Karim Sapag, Gustavo Curutchet, Rosa M. Torres SánchezAbstractA raw montmorillonite (MMT) and three organomontmorillonites (OMMTs) with different amounts of hexadecyltrimethylammonium bromide (HDTMABr), and further silver loading (MMT–Ag or OMMT–Ag) were used to study their surface and structural changes and fungicidal activity. For OMMT and OMMT–Ag samples, the specific surface area and micropore amount decreased with the inc...
Source: Comptes Rendus Chimie - October 12, 2018 Category: Chemistry Source Type: research
Organoclay applications and limits in the environment
This article gives an overview of the preparation, applications, and limits of organoclay materials in the environment field. Organoclays are obtained by the combination of clay minerals and surfactants (quaternary alkyl ammonium salts and others) and are appropriate candidates for the adsorption of organic contaminants such as pesticides, herbicides, and pharmaceuticals that are more and more found in the water resource despite wastewater treatments. This review article focuses on novel organoclay preparation methods based on the use of nonconventional nonionic surfactants and the interest and limits of these hybrid mater...
Source: Comptes Rendus Chimie - October 10, 2018 Category: Chemistry Source Type: research
A perturbation method to estimate building thermal performance
This article presents a review of various perturbation methods developed to assess building thermal performance, details of theoretical understanding of the QUB method, and gathers experimental results obtained in many different configurations. The heat loss coefficients estimated with the QUB method are in good agreement with experimental references and are reproducible. This demonstrates that the QUB method has a real potential to estimate the heat loss coefficient of a building in a short duration and with a reasonable accuracy. (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - October 7, 2018 Category: Chemistry Source Type: research
Highly selective solvent-free hydrogenation of pinenes to added-value cis-pinane
Publication date: Available online 6 October 2018Source: Comptes Rendus ChimieAuthor(s): Fanta J. Ndongou Moutombi, Ayyoub Selka, Anne-Sylvie Fabiano-Tixier, Delphine Foucher, Olivier Clarisse, Farid Chemat, Mohamed TouaibiaAbstractHeterogeneous catalysts based on different active metals (Pd, Pt, Ru, and Rh) and supports (carbon and alumina) were systematically tested for hydrogenation of pinenes under various reaction conditions including heating and/or sonication. Among all, Ru provided some of the best results. After sonication, Ru/C was found highly active and selective for the reduction of α-pinene alone into cis-pin...
Source: Comptes Rendus Chimie - October 7, 2018 Category: Chemistry Source Type: research
Tribromide ion supported on boehmite nanoparticles as a reusable catalyst for organic reactions
Publication date: Available online 5 October 2018Source: Comptes Rendus ChimieAuthor(s): Arash Ghorbani-Choghamarani, Zeinab Seydyosefi, Bahman TahmasbiAbstractBoehmite nanoparticles are not air or moisture sensitive; therefore, they were prepared in water at room temperature using inexpensive materials, without inert atmosphere, by a very simple and inexpensive procedure. When the surface of boehmite nanoparticles was modified by N,N,N′,N′-tetraethyldiethylenetriamine (TEDETA), tribromide ions became immobilized on modified boehmite nanoparticles (Br3-TEDETA@Boehmite). These materials were characterized by Fourier tra...
Source: Comptes Rendus Chimie - October 6, 2018 Category: Chemistry Source Type: research
Bioinspired nanostructured materials
Publication date: Available online 14 September 2018Source: Comptes Rendus ChimieAuthor(s): Jacques LivageAbstractInorganic materials, such as glasses and ceramics, are normally prepared by heating powders at high temperature via the so-called “shake and bake” chemistry. Nature shows that microorganisms, such as diatoms, are able to build silica shells at room temperature via the condensation of silicic acid solutions. Following this example, the so-called “sol–gel process” was developed to build nanostructured materials via the polycondensation of molecular precursors in solution. The mild conditions associated ...
Source: Comptes Rendus Chimie - September 15, 2018 Category: Chemistry Source Type: research
Editorial Board - English
Publication date: September 2018Source: Comptes Rendus Chimie, Volume 21, Issue 9Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - September 13, 2018 Category: Chemistry Source Type: research
Editorial Board - French
Publication date: September 2018Source: Comptes Rendus Chimie, Volume 21, Issue 9Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - September 13, 2018 Category: Chemistry Source Type: research
Sommaire / Contents
Publication date: September 2018Source: Comptes Rendus Chimie, Volume 21, Issue 9Author(s): (Source: Comptes Rendus Chimie)
Source: Comptes Rendus Chimie - September 13, 2018 Category: Chemistry Source Type: research
Transition metal oxides with triangular metallic sublattices: From multiferroics to low-dimensional magnets
Publication date: Available online 11 September 2018Source: Comptes Rendus ChimieAuthor(s): Bernard Raveau, Vincent Caignaert, Vincent Hardy, Mohammad Motin SeikhAbstractThe very recent studies of two classes of transition metal oxides with a triangular metallic sublattice are reported. The first class of materials concerns the swedenborgite CaBaCo4O7 family, which is shown to be a ferrimagnetic multiferroic with a gigantic-induced electrical polarization, and the second one deals with the spin chain oxides of the Sr4Mn2CoO9 type, which have been found to behave as single chain magnets and single ion magnets. These materia...
Source: Comptes Rendus Chimie - September 12, 2018 Category: Chemistry Source Type: research
Novel 4-azaandrostenes as prostate cancer cell growth inhibitors: Synthesis, antiproliferative effects, and molecular docking studies
In this study, synthesis, structural characterization, molecular docking studies, and antiproliferative effects in four different cell lines of several novel 16-arylidene-4-azaandrost-5-ene compounds are reported. These compounds were prepared by oxidative cleavage of the enone system of androstenedione followed by an azacyclization reaction and an aldol condensation with various aldehydes at C16. In the androgen-dependent LNCaP cells, the most relevant antiproliferative effects were observed with the 16-phenyl, 16-p-tolyl, and 16-p-nitrophenyl derivatives. Compound 16E-[(4-methylphenyl)methylidene]-4-azaandrost-5-ene-3,17...
Source: Comptes Rendus Chimie - September 8, 2018 Category: Chemistry Source Type: research
