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Дисертації з теми "Précurseurs – Synthèse (chimie)":
Rondot, Benoît. "Synthèse biomimétique de précurseurs d'isoprostanes par carbocyclisation radicalaire." Montpellier 2, 1994. http://www.theses.fr/1994MON20243.
Greber, Matthieu. "Synthèse de précurseurs hétéropolyanioniques réduits pour la catalyse." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10165/document.
Heteropolyanions (HPA) have remarkable acidobasic and redox properties, which made of them attractive catalytic compounds. HPA can modify their sareduced states during catalytic processes, they also can be used to improve catalytic performances. In this context, this work presents various ways of reduced heteropolyanions synthesis descended from H4SiMo12O40 and H3PMo12O40 Keggin acids, allowing a reduction state control. 2 and 4 electrons reduced HPA’s have been obtained in solution or as various salts, by using reducing agents as MoCl3, H2N-NH2 and NaBH4 or electrolysis. New reduced compounds incorporating Sn or Ti in their structures have been isolated using metallic reducing agent like tin or titanium. Solution and solid state studies show that kinetic control of the reaction facilitates substituted species formation, in which one tin or titanium atoms can replace molybdenium atoms. In contrast, harder thermodynamic reactions conditions induce the formation of tin or titanium capped compounds. 2 news mono capped ((IV)α[SiMo12O40Sn(OH2)2]4-, (TBA+)4 ) and bi capped ((IV)α[SiMo12O40(SnO)2]4-, (TBA+)4 ) structures have been described by mono cristal DRX. A catalytic opening HDS study is also proposed, showing a best sulfuration of the pre reduced species, particularly capped species
Sodreau, Alexandre. "Design de précurseurs organométalliques et synthèse contrôlée de nano-objets de germaniure de fer." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30290/document.
Controlled synthesis of nano-alloys of iron germanide has gained a renewed interest thanks to the recent discovery of new applications in the field of information storage. However, the chemistry of the iron-germanium pair is a complex chemistry that remains little studied. The work presented in this thesis combines molecular chemistry and nano-object chemistry to explore the potential of single-source precursors for solution synthesis, in soft conditions, of iron germanium NPs. First, we focused on the formation of new complexes with an amidinatogermylene-type architecture offering a balance between the stabilization of complexes and their decomposition temperatures, for example mono-germylene iron complexes {[iPrNC(tBu)NiPr]GeCl}Fe(CO)4 and {[iPrNC(tBu)NiPr]GeHMDS}Fe(CO)4 or the bis-germylene iron complex {[iPrNC(tBu)NiPr]GeCl}2Fe(CO)3. In a second step, we show that this method represents a path of choice to reach the formation of nano-alloys of iron germanide and that the architecture of the mono-source precursors allows to control the final nanoparticles. In particular, the decomposition at 200°C. of the {[iPrNC(tBu)NiPr]GeHMDS}Fe(CO)4 complex leads to the formation of Fe3,2Ge2 spherical nanoparticles, with a mean diameter of 6.5 ± 0.8 nm, exhibiting a ferromagnetic behavior
Grosshans, Vièles Sarah. "Nanoparticules dérivant de précurseurs moléculaires dans des solides mésoporeux : synthèse et propriétés." Mulhouse, 2007. https://www.learning-center.uha.fr/opac/resource/nanoparticules-derivant-de-precurseurs-moleculaires-dans-des-solides-mesoporeux-synthese-et-propriet/BUS4012223.
The organized mesoporous silica (OMS) have many properties, making them excellent candidates as supports of nanoparticles dispersed in matrices. In particular, their regular porosity (site and arrangément) should favor the formation of nanoparticles with narrow size distributions and spatially well dispersed in the pares/charnels of the matrix. The aim of this PhD is to generate metallic nanoparticles into mesoporous silica matrices having controlled and organized porosity (OMS type MCM-41 or SBA-15) or without (xerogel). Our strategy consisted in the incorporation of molecular metallic precureurs in the pores of the silica matrix using varions methods and Men in generating metallic nanoparticles by reduction under controlled atmosphere. In a first part, the elaboration of OMS type MCM-41 materials with cobalt was carried out by direct synthesis using cobalt soap combined with C16TMABr, templating agent which is usually used for the synthesis of MCM-41. The cell parameter and the pores' sire of the samples depend on the amount of cobalt soap incorporaed. Indeed, the cobalt soap behaves like a co-surfactant in the synthesis of these samples, sine it forms with C16TMABr mixed micelles. Alter a suitable reducing heat traatment on calcined samples, cobalt nanoparticles were formed. In a second part, methods of incorporation by impregnation or grafting during a post-synthesis treatment of the cobalt cluster Co4(CO)Io(µ-NH(PPh2)2) were studied. These two methods lead to the formation of the Co2P phase. However, the conditions of heat traatment implemented did not result in nanoparticles confined into OMS. In a last part, bimetallic palladiummolybdenum clusters were incorporated by impregnation in two silica matrices ordered or rot. A suitable heat traaement led in botte cases to the formation of nanoparticles of new bimetallic phase (PdI,7Moo44P). The use of OMS matrix type SBA-15 materials, brings about formation of particles confined and dispersed in the pores of the mesoporous hosts. However, luger particles are obtained in the case of a xerogel matrix, featuring polydisperse and disordered pores
Chapelon, Anne-Sophie. "Chimie des allylsilanes et application à la synthèse de précurseurs de la vitamine D3." Aix-Marseille 3, 2007. http://www.theses.fr/2007AIX30078.
This work deals with the reactivity of allylsilanes and their use in the synthesis of vitamin D3 precursors. The first chapter depicts reactions between 1,4-bis(trimethylsilyl)-2-butene and various substituted aromatic aldehydes leading to the corresponding vinylallylbenzenes. This part also reviews the synthetic scope of 1,8-bis(trimethylsilyl)-octa-2,6-diene (BISTRO) involved in the synthesis of divinylcyclopentanes which were used as building blocks for the preparation of vitamin D3, precursors. The second chapter reviews various works related to the synthesis of vitamin D3, precursors. In this part, we have prepared a fulvene derivative of cycle A as well as a parent compound of bicycle CD threw 1,3 dipolar cycloaddition. Finally, we have achieved the enantioselective synthesis of a sulfonyl derivative of bicycle CD. Functionalisation studies were then conducted on its side chain
Moutou, Gillian. "Chimie de l'acide cyanhydrique à partir d'un rejet industriel : synthèse des glycolonitriles, aminoacétonitrile, polyoxamide et précurseurs." Montpellier 2, 1993. http://www.theses.fr/1993MON20217.
Soumare, Yaghoub. "Synthèse et organisation de nanoparticules magnétiques anisotropes par Chimie Douce : nouveaux précurseurs pour aimants permanents." Paris 7, 2008. http://www.theses.fr/2008PA077184.
Anisotropic magnetic nanoparticles have been prepared via chimie douce methods by raduction of cobalt(II) and nickel(II) carboxylate precursors in basic solutions of 1,2-propanediol at 170°C using heterogeneous nucléation. With acatates as matal precursors, Co₈₀Ni₂₀ nanowires with a mean diameter of 8 nm and a mean length more than 200 nm were generated. The use of new cobalt carboxylate precursors led to Co nanorods with a mean diameter of 20 nm and a mean length of 100 nm. Moreover, the aspect ratio (mean length / mean diameter) can be tailored by modifying accurately the reaction parameters such as the nature of the metallic precursor, the basicity of the medium or the temperature rate. The metallic Co₈₀Ni₂₀ nanowires and Co nanorods crystallise mainly with the hexagonal close packed structure with the c axis the growth axis of the particle. These nanomaterials are ferromagnetic at room temperature and when aligned using an external magnetic field, their magnetic properties are considerably improved. These results prompt us to use these particles as building blocks for the preparation of a new class of permanent magnets
Chevrie, David. "Alpha-fluorosulfures et alpha-fluorosulfoxydes, précurseurs appropriés à la synthèse de fluoroalcènes (Z)." Caen, 2001. http://www.theses.fr/2001CAEN2068.
Inguimbert, Nicolas. "Synthèse et réactivité d'ylures et diylures de cyanamides phosphorés, de leurs dérivés guanidines précurseurs de phosphatriazines." Montpellier 2, 1997. http://www.theses.fr/1997MON20050.
Herrera, Martinez Juan Manuel. "Octacyanométallates précurseurs de systèmes moléculaires de dimension contrôlée : synthèse, structure et magnétisme." Paris 6, 2003. http://www.theses.fr/2003PA066155.
Частини книг з теми "Précurseurs – Synthèse (chimie)":
DEL MAR SAAVEDRA RIOS, Carolina, Adrian BEDA, Loic SIMONIN, and Camélia MATEI GHIMBEU. "Le carbone dur pour les batteries Na-ion : de la synthèse aux performances et mécanismes de stockage." In Les batteries Na-ion, 123–74. ISTE Group, 2021. http://dx.doi.org/10.51926/iste.9013.ch3.
Lubin-Germain, Nadège, Richard Gil, and Jacques Uziel. "9. Préparation d’un précurseur de mycolactones." In Synthèses en chimie organique, 50–55. Dunod, 2016. http://dx.doi.org/10.3917/dunod.lubin.2016.01.0050.
Lubin-Germain, Nadège, Richard Gil, and Jacques Uziel. "10. Synthèse d’un précurseur de la jiadifénine." In Synthèses en chimie organique, 56–61. Dunod, 2016. http://dx.doi.org/10.3917/dunod.lubin.2016.01.0056.