Letteratura scientifica selezionata sul tema "Aimants à base de molécules"
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Articoli di riviste sul tema "Aimants à base de molécules"
Matondo, Aristote, Jean-Paul Ngbolua e Pius T. Mpiana. "Evaluation in silico du profil toxicologique de quelques molécules isolées de Aloe vera et de la pastèque (Citrullus lanatus) utilisées dans la formulation des crèmes solaires". Revue Congolaise des Sciences & Technologies 3, n. 2 (30 giugno 2024): 130–38. http://dx.doi.org/10.59228/rcst.024.v3.i2.76.
Testo completoAyadi, Sameh, e Manef Abderrabba. "Étude DFT (« density functional theory ») des réactions d’addition de l’ozone sur les doubles liaisons des terpènes : limonène, β-phellandrène et terpinolène". Canadian Journal of Chemistry 89, n. 6 (giugno 2011): 703–8. http://dx.doi.org/10.1139/v11-065.
Testo completoCAVAILLE, L., J. M. CANONGE e C. ALBASI. "Caractérisation de l’eau usée d’un centre d’oncologie pour l’estimation de l’impact du déversement de ses molécules pharmaceutiques en rivière". Techniques Sciences Méthodes 12 (20 gennaio 2023): 91–103. http://dx.doi.org/10.36904/202212091.
Testo completoDiarra, B., e Et Al. "ANALYSE DE LA PRESCRIPTION ET DE LA DISPENSATION DES CEPHALOSPORINES DANS LE DISTRICT DE BAMAKO". Revue Malienne d'Infectiologie et de Microbiologie 17, n. 2 (2 dicembre 2022): 61–65. http://dx.doi.org/10.53597/remim.v17i2.2784.
Testo completoLeonelli, Claire. "État du droit luxembourgeois et évolution en matière de cannabis purement récréatif et « well being »". Pin Code N° 3, n. 1 (28 marzo 2020): 11–15. http://dx.doi.org/10.3917/pinc.003.0011.
Testo completoBourass, Mohamed, e Mohammed Bouachrine. "Étude structurale des systèmes dissymétriques de structure D-π-A à base de thiénopyrazine destinés aux cellules solaires organiques de type « bulk heterojunction » (BHJ)". Canadian Journal of Chemistry 97, n. 10 (ottobre 2019): 745–55. http://dx.doi.org/10.1139/cjc-2019-0053.
Testo completoBui, Thanh-Tuan, e F. Goubard. "Matériaux de transport de trous à base de petites molécules organiques pour cellules photovoltaïques hybrides solides". Matériaux & Techniques 101, n. 1 (2013): 102. http://dx.doi.org/10.1051/mattech/2013056.
Testo completoGAUTRON, J., S. REHAULT-GODBERT, V. JONCHERE, V. HERVE-GREPINET, K. MANN e Y. NYS. "L’apport des techniques à haut débit (protéomique et transcriptomique) dans l’identification et la caractérisation fonctionnelle des protéines de l’œuf". INRAE Productions Animales 23, n. 2 (10 aprile 2011): 133–42. http://dx.doi.org/10.20870/productions-animales.2010.23.2.3295.
Testo completoZimé Diawara, Hermine, Bavouma charles Sombié, Josias B. G. YAMEOGO, Harouna Bagaya, Kouka Luc Delma e Rasmané Semdé. "Évaluation des besoins en préparations hospitalières pédiatriques dans les centres hospitaliers universitaires de Ouagadougou". Journal Africain de Technologie Pharmaceutique et Biopharmacie (JATPB) 1, n. 2 (6 aprile 2023): 12–25. http://dx.doi.org/10.57220/jatpb.v1i2.27.
Testo completoKafuti Makengo, Gisèle. "Evaluation of the antioxidant capacity of a complementary food based on traditional resources: the case of Vamine®". Revue Congolaise des Sciences & Technologies 2, n. 3 (1 febbraio 2022): 392–98. http://dx.doi.org/10.59228/rcst.023.v2.i3.43.
Testo completoTesi sul tema "Aimants à base de molécules"
Jung, Julie. "Étude ab initio de molécules aimants à base d'ions lanthanides". Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S038/document.
Testo completoLanthanide ions have been used successfully in the synthesis of single molecule magnets for more than a decade. This particular class of molecules shows slow relaxation of their magnetization from purely molecular origin. This property come mainly from the strong single ion anisotropy of these ions, and from their high magnetic moment. In the case of complexes with more than one spin carrier (3d, 4f metal or organic radical), coupling interactions can arise. These are called magnetic exchange. In this framework, ab initio calculations are a useful tool for magneto-structural correlations
Long, Jérôme. "Assemblages supramoléculaires hétérotrimétalliques à base d'octacyanométallate : vers des molécules-aimants photo-commutables". Paris 6, 2009. http://www.theses.fr/2009PA066281.
Testo completoIasco, Olga. "Aimants moléculaires à base de clusters polymétalliques : synthèse, structures cristallines et étude des propriétés magnétiques". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00838606.
Testo completoEl, Rez Bahjat. "Contrôle de la stéréochimie du centre Ln dans des complexes base de Schiff 3d-4f : application à l'élaboration de molécules-aimants chirales". Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30002/document.
Testo completoThe research work described in this thesis deals with the design, the synthesis and magnetic property investigation of magnetic low dimensional molecular materials (i.e. single Molecule Magnets, SMM), especially in 3d-4f Schiff-base complexes, involving magnetically anisotropic lanthanide (Ln) metal centers in conjunction with chirality. The aim of this investigation was to provide an efficient access to enantiopure SMMs chiral at metal (Ln). We developed an original chemical approach that consists in introducing a chiral chelating diketonate ligand directly bonded to the Ln metal center. Thus transfer of chirality from chiral ligand to the coordination polyhedron of the metal center can be achieved. Deprotonated 3-trifluoroacetyl-camphor (Camph-) has been utilized as the chiral chelating ligand to synthesize several 3d-4f Schiff-base complexes, where two chiral anions are anchored on Ln ion rendering chiral coordination sphere around the rare-earth metal center. Depending on the enantiomer of the ligand employed in the synthesis, either Delta or LAmbda stereochemistry of the Ln polyhedron is obtained. This approach allowed synthesis of several families of enantiopurs SMMs chiral at Ln such as [LMe2Ni(H2O)Ln(camph)2(CF3SO3)] or [LMe2Zn(Cl)Ln(camph)2(MeOH)], where LMe2 = bicompartmental Schiff-base ligand. In each case, reaction with the R-(+) Camph ligand results in a Lambda stereochemistry, while a Delta stereochemistry is yielded upon reaction with the S-(-) Camph ligand. However, such a stereo-selectivity is not systematic. The third anion or an ancillary ligand associated with the rare-earth metal centers appears to play an important role in controlling the stereochemistry of the coordination sphere around the rare-earth metal centers. Using the same approach, we have also successfully isolated mono-metallic chiral 4f complexes of general formulae [Ln(Camph)4]-. The study of magnetic behaviors revealed Single Molecule Magnet (SMM) behavior for several complexes containing Tb or Dy ions
Shao, Feng. "Ingénierie de l’anisotropie magnétique dans les complexes mononucléaires de cobalt(II) et les métallacrowns à base de lanthanides". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS126/document.
Testo completoAs we know, the applications are determined by properties, which are essentially determined by structure. The interplay between form (molecular structure) and function (physical properties) can be exploited engineering by the ligand, the metal ion, the metallacrown approach and so on. The work focuses on the synthesis and the study of the magnetic behavior of mononuclear cobalt(II) complexes with trigonal geometry and on the study of mononuclear lanthanide complexes that possess a metallacrown structure.For the cobalt(II) complexes, the aim was to tune the magnetic anisotropy by changing the nature of the tetradentate organic ligand and the terminal ligand. Almost all these complexes behave as Single Molecule Magnets with an energy barrier to the reversal of the magnetization that can be linked to their magnetic anisotropy and thus to the nature of the organic ligands. The lanthanide containing metallacrown complexes are highly symmetric, which allows performing a correlation between the nature of the lanthanide ion and their Single Molecule Magnet properties.The dissertation will be composed of 6 chapters. Chapter 1 introduces the background of the magnetism, Single Molecule Magnets, Single Ion Magnets, and some important SIMs. Chapter 2 focuses on a family of trigonal bipyramidal complexes [Co(Me6tren)X]Y. We show that the axial ligand affects the SMM behavior allowing us to prepare a complex with a magnetic bistability at T = 2 K. In Chapter 3, we examine the effect of changing the coordinated atoms (sulfur instead of nitrogen) in the equatorial coordination sphere of cobalt(II). We demonstrate that this slight change improves the SMM behavior. Chapter 4 and 5, which concern two series of 12-MC-4 SMMs based on LnGa4 (Ln = TbIII, DyIII, HoIII, ErIII, YbIII) with the ligands salicylhydroxamic acid (H3shi) and 3-hydroxy-2-naphthohydroxamic acid (H3nha), respectively, where we correlate the nature of the lanthanide ion to its magnetic behavior using ab initio calculations. At last, the understanding gained from this dissertation research, along with future research directions will be recapitulated in Chapter 6
Wang, Yiting. "Syntheses, Crystal Structures and Characterizations of Mono- and Polynuclear Ni- and Co-based Molecular Magnets". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS225.
Testo completoThe objective of elaborating “magnets by design” can be achieved by tailoring the molecular structures of coordination complexes. The designed molecules are expected to exhibit the characteristics required for specific applications, virtually resulting from their rich structural diversity. Mononuclear Ni-based complexes with large magnetic anisotropy and polynuclear Ni- and Co-based molecules are designed in this dissertation. The syntheses, magnetic studies, and electrochemical properties of the complexes containing non-innocent bridge ligand are investigated. The Ni(II) mononuclear complexes with trigonal bipyramid geometry are prepared by tuning the axial ligands and the counter anions. The effect of the nature of the axial ligands and the structural change induces by the counter anions on magnetic anisotropy is studied experimentally and analyzed with the help of theoretical calculations. Large organic molecules are used to design trinuclear complexes with large magnetic anisotropy and weak exchange coupling. Several polynuclear Ni- and Co-based complexes with TTC³⁻ acting as an innocent bridging ligand and HHTP as a typical non-innocent ligand, are crystallized with various structures (TTC = Trithiocyanurate; HHTP = Hexahydroxytriphenylene). For the complexes containing the non-innocent ligand (HHTP), radical anions are produced by electrochemistry. The combination of spectroelectrochemical and Electron Paramagnetic Spectroscopy coupled to electrochemistry studies allow investigating the delocalization of the electrons on the generated organic radicals and the exchange coupling among the metal ions
Fernandez, Garcia Guglielmo. "Lanthanide-based SMMs : from molecular properties to surface grafting exploiting multi-level ab initio techniques". Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S171/document.
Testo completoThe Ph.D. project was a joint agreement between two universities: Université de Rennes 1 in France and Università di Firenze in Italy. The project aimed to shed light on the rationalization of the inter- and intramolecular properties of novel lanthanide-based Single Molecule Magnets, SMMs, (“molecular part”) and their evolution once adsorbed on surface (“surface part”). Both aspects are examined within a theoretical and computational framework, with different multi-level techniques ranging from periodic Density Functional Theory (pDFT) to post-Hartree-Focks approaches, depending on the experimental observable of interest. SMMs are, indeed, at the cutting-edge in the design of novel magnetic materials in surface science (as spintronics or memory storage devices), but for their exploitation a deep understanding of their electronic and magnetic properties is needed
Bachschmidt, Anne. "Nouveaux matériaux photomagnétiques à base de polycyanométallates : des analogues du bleu de Prusse aux molécules à haut spin". Paris 6, 2007. http://www.theses.fr/2007PA066676.
Testo completoAdak, Abhijit. "Matériaux moléculaires magnétiques bidimentionnels construits à partir du ligand redox-actif pyrazine". Electronic Thesis or Diss., Bordeaux, 2023. http://www.theses.fr/2023BORD0479.
Testo completoThis thesis presents synthesis and characterizations of novel two-dimensional (2D) molecule-based magnetic materials based on redox-active pyrazine ligands and transition metals. The role of axial ligands in this kind of systems as well as post-synthetic technique to enhance the magnetic exchange interactions have been explored in this thesis. Chapter I discusses brief literature survey on molecule-based magnets and strategy to design high critical temperature (Tc) molecule-based magnets. Chapter II provides general concepts of magnetism, X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) that are essential for understanding of the experimental results obtained in this thesis. Chapter III describes synthesis and characterization of Cr(pyz)2I2 coordination solid and illustrates the role of post-synthetic modification in enhancement of magnetic ordering temperature (Tc). Chapter IV is devoted to investigate the role of axial ligand substitution in a family of coordination network V(pyz)2X2 (where, X = Cl, Br. I and NCS). Chapter V deals with the post-synthetic reduction of the coordination solids discussed in chapter IV
Chatelain, Lucile. "Conception d'assemblages polymétalliques d'uranium pour le développement de molécules aimants". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAV076/document.
Testo completoThe study of actinide chemistry is not only essential for the development of nuclear fuel, nuclear fuel reprocessing or environmental clean up, but also for the understanding of fundamental actinide/ligand interactions and multiple bounding. The magnetic properties of polynuclear actinide molecules are of significant interest to investigate the magnetic communication between the metallic centres. Furthermore, they are highly promising for the design of molecular magnets. Uranium undergoes redox reactions due to a wide range of available oxidation states and easily forms polynuclear assemblies. However, only a few controlled synthetic routes towards these polynuclear uranium assemblies are described in the literature. In this context, the first part of this work was dedicated to the synthesis of oxo/hydroxo uranium clusters from the controlled hydrolysis of tetravalent uranium in the presence of an environmentally relevant ligand. This led to the synthesis of clusters with novel topologies, for which size could be varied as a function of the reaction conditions employed. However, the obtained clusters do not behave as SMM. In order to gain a stronger interaction between metallic centres, the cation-cation interaction was used to rationally design polynuclear uranyl(V) complexes. The isolation of uranyl(V) complexes had been limited in the past by its disproportionation, however, a fine tuning of the organic ligand and reaction conditions finally allowed to stabilise uranyl(V). We used stable uranyl(V) units as building block to form heteronuclear complexes with 3d and 4f metals with polymeric or discrete structures. The study of the magnetic properties of the uranium polynuclear assemblies was carried out and revealed single molecule or chain magnet behaviours with high energy barriers. The uranyl(V) unit was also used as a structural model for the more radioactive neptunium element, allowing the isolation of an isostructural trinuclear neptunyl(V) assembly in similar reaction conditions. Finally, the use of a nitride ligand as a bridging unit, allowing the formation of uranium-ligand multiple bonds, was explored to build novel di-uranium complexes supported by siloxy ligands. Nitride molecules containing unprecedented uranium in the +III oxidation state were isolated and characterised
Capitoli di libri sul tema "Aimants à base de molécules"
"3 Langage et concepts de base". In Molécules chirales, 29–44. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0281-4-005.
Testo completo"3 Langage et concepts de base". In Molécules chirales, 29–44. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0281-4.c005.
Testo completo