Comptes Rendus Chimie (CR CHIM )

Publisher: Académie des sciences (France), Elsevier


Articles in English and French with Abridged English Version. Les Comptes Rendus Chimie publient depuis 1998 des travaux de recherches originaux (notes, mémoires courts) et des articles de synthèses (mises au point, chroniques historiques) dans tous les domaines de la chimie (organique, inorganique, bio-organique, bioinorganique, organométallique, physique, état solide...).

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    Comptes rendus. Chimie, Chimie
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    Journal / Magazine / Newspaper, Internet Resource

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    • Publisher last contacted on 18/10/2013
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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Studies on methylene blue (MB) removal from aqueous solutions by anodic oxidation (AO) using boron doped diamond (BDD) electrode, adsorption onto sawdust and combined treatment have been undertaken. Results proved that AO presents a high efficiency in removing both colour and COD for a wide pH interval. Total mineralization of dye solution was performed in 6 hours which corresponds to relatively high energy consumption. On the other hand, high sawdust dosage (12 g L-1) was needed to ensure 98% of colour and 81% of COD removal. Combining AO and adsorption onto sawdust constitute a very interesting technology. For instance, AO for 1 hour followed by sorption permits a reduction of energy consumption of 80 Wh (gCOD)-1, a reduction of more than 24 times of the adsorbent dose and an enhancement of colour and COD removal indicating that sawdust is efficient in removing not only the MB initial molecules but also the electro-generated by-products.
    Comptes Rendus Chimie 10/2014;
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    ABSTRACT: Alkyl and acyl derivatives of 3,4-dihydropyrimidin-2(1H)-thiones were synthesized in good to excellent yields in the presence of Cs2CO3, a mild base. The method evidences a selective S-alkylation when using acyl chlorides as efficient acylating agents at room temperature on the 2-thioxo-dihydropyrimidone moiety. A possible mechanistic interpretation of the different selectivities in case of alkylation and acylation was done with the help of a geometry optimization process.
    Comptes Rendus Chimie 10/2014; 17(10):1057-1064.
  • Comptes Rendus Chimie 10/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: A practically expeditious protocol has been developed for the cascade synthesis of 2,3-dihydroquinazolin-4(1H)-ones via the condensation of 2-aminobenzamide/2-aminobenzanilide and aromatic aldehydes using a catalytic amount of silica-supported ceric ammonium nitrate. This method affords rapid transformation at room temperature with good to excellent yields.
    Comptes Rendus Chimie 10/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: An efficient and economical protocol for the synthesis of 5-substituted-1H –tetrazoles from various nitriles and sodium azide is reported using nano TiO2 /SO42- as an effective heterogeneous catalyst. A wide variety of aryl nitriles underwent [3 + 2] cycloaddition to afford tetrazoles in good to excellent yields.
    Comptes Rendus Chimie 10/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: L’iode catalyse la cyclo-condensation de divers aldéhydes avec le résorcinol afin de préparer des produits cycliques tétramériques appelés résorcinarènes. Les produits obtenus avec des aldéhydes aromatiques présentent deux isomères (RCCC et RCTT), tandis qu’un seul diastéréoisomère (RCCC) est formé avec les aldéhydes aliphatiques. Ainsi, cette nouvelle procédure faisant intervenir l’iode comme catalyseur constitue une nouvelle méthode simple et rentable pour l’obtention de calix[4]resorcinarènes.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: The 2,6-bis(benzimidazol-2′-ylthiomethyl)pyridine (L) ligand and its palladium(II) complexes [Pd(L)X]X (X = Cl, Br, and I) have been synthesized and characterized by spectroscopic data acquisition. The ligand (L) was prepared by conventional heating as well as by microwave irradiation. Microwave irradiation shows additional features, including an easy workup, a much faster reaction and higher yields. The molar conductivity data reveal that the complexes form a 1:1 electrolyte in DMSO. The geometries, ground-state energetics and vibrational spectra of (L) and of its complexes have been elucidated, in terms of quantum chemical calculations. In the mononuclear complexes, the palladium atom is coordinated to three nitrogen atoms and one terminal halogen atom in a slightly distorted square planar arrangement. The present elemental analyses, FT–IR (mid, far), 1H and 13C NMR spectra are in good accordance with the square planar geometry around the Pd ion. The thermal behaviors of the complexes have been assessed by thermal gravimetric and differential thermal analyses.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: The principal aim of the present study was to develop new safe and highly antioxidant nanostructured lipid carriers loaded with sea buckthorn extract. Three vegetable oils — grape seed oil, sea buckthorn oil and St. John's wort oil (Hypericum perforatum oil) — were used as matrix components and the modified high shear homogenization technique has been employed for the synthesis of nanostructured materials. The effect of these oils on the antioxidant and antimicrobial activities of loaded sea buckthorn extract — nanostructured lipid carriers — has also been studied. For this purpose, a combination of two solid lipids: cetyl palmitate with glyceryl stearate and lecithin/block copolymer has been used. The obtained nanostructured lipid carriers have been characterized for the particle size and zeta potential by means of dynamic light scattering measurements. The nano-dimension morphology of loaded nanostructured lipid carriers was confirmed by transmission electron microscopy. Their crystallinity measured by differential scanning calorimetry has revealed a high disordered lipid matrix. The properties of sea-buckthorn-extract-loaded nanoparticles have been evaluated by an appropriate in vitro analysis (chemiluminescence method). The presence of the three vegetable oils influences extensively the antioxidant properties of the developed nano-formulations, as has been demonstrated using the chemiluminescence technique. The antimicrobial activity of the studied nanostructured lipid carriers, analyzed by the diffusion disc method, shows in most of the samples a high efficiency against Escherichia coli bacteria.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: Des apatites phosphosilicatées au lanthane de formule chimique Sr10–xLax(PO4)6–x (SiO4)xO où 0 ≤ x ≤ 6, généralement préparées par réaction à l’état solide à environ 1400 °C environ, ont été synthétisées par mécanosynthèse à la température ambiante. Les échantillons ont été caractérisés par diffraction des rayons X, spectroscopie infrarouge et analyse thermique. Les résultats ont montré que les produits obtenus étaient des apatites carbonatées et aucune phase secondaire n’a été détectée. La réalisation du broyage sous atmosphère contrôlée devrait conduire à des oxyapatites ne contenant pas de carbonates. La conductivité ionique de l’échantillon Sr6La4 (PO4)2(SiO4)4O a été étudiée par spectroscopie d’impédance. La valeur de la conductivité ionique la plus élevée, 1,522 × 10−6 S·cm–1, a été déterminée à 800 °C. Dans le domaine de température étudié, l’énergie d’activation est de 0,85 eV.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: In water, Al powder becomes a powerful reducing agent, transforming in cyclohexyl either one or both benzene rings of aromatic compounds such as biphenyl, fluorene and 9,10-dihydroanthracene under mild reaction conditions in the presence of noble metal catalysts, such as Pd/C, Rh/C, Pt/C, or Ru/C. The reaction is carried out in a sealed tube, without the use of any organic solvent, at low temperature. Partial aromatic ring reduction was observed when using Pd/C, the reaction conditions being 24 h and 60 °C. The complete reduction process of both aromatic rings required 12 h and 80 °C with Al powder in the presence of Pt/C.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: Zn(thqdtc)2, Zn(thqdtc)2(py) and Zn(thiqdtc)2(py) (where thqdtc = 1,2,3,4-tetrahydroquinolinecarbodithioate, thiqdtc = 1,2,3,4-tetrahydroisoquinolinecarbodithioate and py = pyridine) have been used as single source precursors for the synthesis of ZnS nanoparticles. The formation of ZnS nanoparticles was achieved by thermal decomposition of the complex under heating in presence of triethylenetetraamine. Transmission electron microscopy, energy dispersive X-ray analysis (EDAX) and powder X-ray diffraction studies were carried out to study the structure and morphology of the nanoparticles. The optical properties of the ZnS nanoparticles were studied by UV–visible and fluorescence emission spectral studies. UV–visible absorption spectral studies indicate a blue shift in the absorption maxima due to the quantum size effect. A single crystal X-ray analysis was carried out for a precursor [Zn(thqdtc)2].
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: New pyrochlore solid solutions Bi1.5Sb1.5–xNbxCuO7 have been synthesized (0 ≤ x ≤ 1.5) via the ceramic method in the air at 1000 °C. Rietveld refinement of the compounds Bi1.5Sb1.5–xNbxCuO7 for x = 0, x = 0.75 and x = 1.5 by means of X-ray powder diffraction analysis confirmed an overall A2B2O7 cubic pyrochlore structure according to (Bi3+1.5Cu2+0.5)(Sb5+1.5–xNb5+xCu2+0.5)O7 formula with 10.42009 (3) Å, 10.47193 (3) Å and 10.52679(4) Å, respectively, and Fd3¯m space group. Composition dependencies of cell parameters show a linear increase with the niobium x fraction. The magnetic susceptibility measurements achieved between 4 and 400 K indicate a paramagnetic behavior with an oxidation state “+2” for the copper ion. The electric resistivity measured using complex impedance spectroscopy evidences an increase of the electric conductivity with temperature and niobium substitution.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: Polymers made of renewable raw materials are attracting increasing interest because of diminishing oil deposits and the pro-ecological character of such polymers. The aim of our study was to create composites of polycaprolactone (PLC) and epoxidised natural rubber (ENR) using innovative natural additives. The cross-linking of composites was performed with the use of amino acids, flavonoids and fatty acids to eliminate sulphur and peroxides that are not environmentally friendly. Some of the cross-linkers used fulfilled the role of antioxidants. Based on WAXD, SEM and DSC examinations, we found good miscibility and compatibility of the polymers. All the innovative compounds used appeared to be good cross-linkers. The best ENR/PCL composite cross-linking effect was obtained with the use of quercetin, a flavonoid that also appeared to be a good anti-ageing substance. The mechanical properties of the composites were satisfactory. Their tensile strength ranged from 10 to 22 MPa at elongation in the range of 292–436%. The ENR/PCL composites were more thermally stable than ENR vulcanisates due to their improved resistance to oxidation. Undoubtedly, these composites exhibit the features of innovative pro-ecological products. They meet current ecological requirements and can be widely used in medicine as well as in materials for common use, such as food packaging.
    Comptes Rendus Chimie 09/2014;
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    ABSTRACT: De nouvelles 6-(O-alky)lbenzochroméno-1,5-benzodiazépin-2-ones 4a–c ont été isolées via la condensation de la [1]benzopyrano[4,3-c][1,5]benzodiazépin-7(8H)one 1 avec une série d’alcools. Les hétérocycles 4 ont montré une capacité particulière à développer de fortes liaisons hydrogène intermoléculaires avec les 2-aminopyridines en donnant naissance à des édifices stables 5. Les systèmes auto-assemblés 5 ont été caractérisés par spectrométrie de masse et par RMN 1D/2D. D’autre part, l’établissement des liaisons hydrogène a été appuyé par spectroscopie IR et Raman ainsi que par des expériences de titration en RMN 1H, et confirmé par radiocristallographie aux rayons X.
    Comptes Rendus Chimie 08/2014;
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    ABSTRACT: This article is the transcript of the acceptance speech given by the author at the French Academy of Sciences upon his receipt of the French-German science prize named after Joseph-Louis Gay-Lussac and Alexander von Humboldt. After a very brief summary of his own achievements in the areas of organometallic catalysis and natural product synthesis, he went on to advocate for a more liberal and less top-down science policy that allows for more curiosity-driven research. The fact that it is exceedingly difficult for anyone − be they scientists or politicians − to predict what might eventually become really important is illustrated by a few historical examples, where seemingly exotic results ultimately turned out to be real scientific breakthroughs and economic success stories at the same time.
    Comptes Rendus Chimie 08/2014;