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1.
2.
Dolorès Edmont Yvon Buisson Philippe Treillard Christophe Plisson Jacques Chenault 《合成通讯》2013,43(2):217-225
A high yielding N-amination of quinolones at low temperature via the use of O-mesitylenesulfonylhydroxylamine is reported. 相似文献
3.
Éric Cancès Geneviève Dusson Yvon Maday Benjamin Stamm Martin Vohralík 《Comptes Rendus Mathematique》2014,352(11):941-946
In this Note, we propose a new method, based on perturbation theory, to post-process the planewave approximation of the eigenmodes of periodic Schrödinger operators. We then use this post-processing to construct an accurate a posteriori estimator for the approximations of the (nonlinear) Gross–Pitaevskii equation, valid at each step of a self-consistent procedure. This allows us to design an adaptive algorithm for solving the Gross–Pitaevskii equation, which automatically refines the discretization along the convergence of the iterative process, by means of adaptive stopping criteria. 相似文献
4.
Madjid Hadioui Med Oimar Mecherri Rastislav Šípoš Yan Yvon Patrick Sharrock 《Chemical Papers》2011,65(6):855-862
Glycidoxypropyltriethoxysilane (GPS) was used as a reactive silane to graft metal- complexing ligands onto silica gel in aqueous
media under mild conditions. The synthesis entailed the reaction of GPS with silica gel, followed by grafting polyamine onto
the epoxy functional group. GPS was added to silica gel in ethanol with 5 vol. % water and the mixture was air-dried for 24
h. Subsequently, excess amounts of polyamines: triethylenetetramine, tetraethylenepentamine, and pentaethylenehexamine were
individually added to the silanised silica, followed by solvent evaporation and ovendrying at 60°C. The ligand-grafted silica
gel particles showed a rapid heavy metal uptake in batch or flow-through experiments with capacities reaching 0.1 mmol g−1 for copper, zinc, cadmium, or lead ions. Columns packed with the modified particles could be readily regenerated by acid-washing
with only a small decrease in activity. The particles could be used for the colourimetric detection of heavy metal pollution
or for pre-concentration for analytical purposes. Competition between Cu2+, Zn2+, Pb2+, and Cd2+ ions for the three synthesised silica showed that Cu2+ ions were adsorbed more strongly than the other metal ions. The general method developed can be applied to graft other molecules
with terminal amino groups for other purposes. 相似文献
5.
H. Hagemann V. D'Anna S. Gomes G. Renaudin K. Yvon 《Journal of Physics and Chemistry of Solids》2011,72(4):286-289
The structural and vibrational properties of the isostructural compounds Ca2FeH6 and Sr2RuH6 are determined by periodic DFT calculations and compared with their previously published experimental crystal structures as well as new experimental vibrational data. The analysis of the vibrational data is extended to the whole series of alkaline-earth iron and ruthenium hydrides A2TH6 (A=Mg, Ca, Sr; T=Fe, Ru) in order to identify correlations between selected frequencies and the T-H bond length. The bulk moduli of Ca2FeH6 and Sr2RuH6 have also been determined within DFT. Their calculated values prove to compare well with the experimental values reported for Mg2FeH6 and several other compounds of this structure. 相似文献
6.
Yvon Pointud Anne-Gaelle Valade Christelle Pointon Georges Jeminet Jose-Luis Beltran 《Supramolecular chemistry》2013,25(4):261-269
The binding abilities of a new class of 14-membered ring ligands bearing diketal dilactam functions were explored by UV-visible spectrophotometry. Their formation constants, determined in THF solution, showed appreciable complexation with divalent cations (stability order: Sr2+≥Ca2+>Zn2+≥Mg2+>Ba2+) whereas no association was observed with monovalent cations. The stoichiometry of the complexes formed was essentially 1:1 although sometimes a low percentage (<10%) of 1:2 (cation–ligand) species was detected. The corresponding formation constants determined by computation (STAR program) were in the range 1.5<log?β 11<4.8 and 4.4<log?β 12<7.1. They depend significantly on the nature of the substituents. In addition, solvent extractions carried out in a water–chloroform system showed the highest constants (log K ex) for the most substituted macrocycles 7b and 7c (norephedrine series) with a lipophilic skeleton. 相似文献
7.
In this Note an improved version of the Schwarz domain decomposition method is introduced for highly heterogeneous media. This method uses new optimized interface conditions specially designed to take into account the heterogeneity between the subdomains on the interfaces. The mathematical analysis of these interface conditions is first presented. Then the asymptotic analysis upon the mesh size parameter together with the heterogeneity ratio is detailed. To cite this article: Y. Maday, F. Magoulès, C. R. Acad. Sci. Paris, Ser. I 341 (2005). 相似文献
8.
P. Yvon 《Fresenius' Journal of Analytical Chemistry》1899,38(7):448
Ohne Zusammenfassung 相似文献
9.
10.
Yvon Pointud Claude Bernard Sébastien Touzain Lionel Astier Béatrice Sabatier Jean Juillard 《Journal of solution chemistry》1997,26(5):479-495
The standard Gibbs functions, enthalpies, and entropies for the formation of the complexes of monensin acid with monovalent
metal cations in acetonitrile were obtained using various methods (conductometry, potentiometry, and calorimetry). Complexation
is appreciable (from 2.0 to 4.5 in terms of association constant logarithm) and controlled mainly by the enthalpic effect.
Comparison with formation of the corresponding neutral complexes permits a comparison to the process of monensin mediated
transport of cation in membranes. A two-step process involving first the formation of the acidic complex is suggested. 相似文献