Littérature scientifique sur le sujet « Complexes polynucléaires métalliques »
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Thèses sur le sujet "Complexes polynucléaires métalliques"
Theil, Sylvie. « Complexes polynucléaires du manganèse (II),(III), (IV). Synthèse, réactivité, propriétés magnétiques et structurales ». Toulouse 3, 1993. http://www.theses.fr/1993TOU30078.
Texte intégralBarré, Christophe. « Métallophosphines à base de molybdène et de tungstène : accès à des systèmes polynucléaires ». Dijon, 1992. http://www.theses.fr/1992DIJOS021.
Texte intégralLamouchi, Meriam. « Matériaux moléculaires à propriétés optique et magnétique à base de complexes métalliques polynucléaires : Thiacalixarènes/métaux de transition ». Phd thesis, Université Claude Bernard - Lyon I, 2012. http://tel.archives-ouvertes.fr/tel-00976987.
Texte intégralZhang, Zhi-Yong. « Synthèse, propriétés structurales, magnétiques et redox de complexes polynucléaires du manganèse avec des ligands à sites donneurs N2O3 ». Toulouse 3, 1994. http://www.theses.fr/1994TOU30102.
Texte intégralGamboa, Ramirez Stefani. « Structure-function relationship in polynuclear bio-inspired copper complexes : combined experimental and computational studies ». Electronic Thesis or Diss., Aix-Marseille, 2023. http://theses.univ-amu.fr.lama.univ-amu.fr/230201_GAMBOARAMIREZ_549h879lvul851osvjs537pe_TH.pdf.
Texte intégralMagnetic systems are crucial in many applications, such as data storage, energy conservation, quantum computing, and telecommunications. In this context, polynuclear complexes featuring magnetic interaction between metal ions are a central topic in molecular magnetism. A magnetic interaction becomes operative when the unpaired electron of two or more open-shell centres are in close proximity. This is described by the exchange coupling constant, J, which reports the strength and nature of the interaction. While this observable can be experimentally measured by SQUID, the correct interpretation of the magnetic properties becomes problematic for large systems. In this regard, quantum chemistry has become a crucial tool for the accurate and unique assignment of electronic structures, and Broken-Symmetry (BS) Density Functional Theory (DFT) appears as the method of choice to predict the magnetic interactions due to its applicability for large systems with a low computational cost. Understanding how the structure shapes the exchange interaction in small systems is a first step to being able to describe the magnetic behaviour of larger and more complicated entities. This work combines experimental and theoretical approaches to investigate the magneto-structural correlation and reactivity of dinuclear copper complexes. Upon setting up the appropriate theoretical approach, we applied our methodology to investigate the electronic and magnetic properties of several polynuclear metal complexes, including (i) a trinuclear nickel complex with redox-active ligands, (ii) a tetranuclear nickel complex, and (iii) a nickel-cubane displaying electroactivity towards oxygen evolution reaction
Ai, Pengfei. « Synthesis and reactivity of metal complexes containing functionalized N-heterocyclic carbene ligands for catalytic applications ». Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF025/document.
Texte intégralThe purpose of this work was the synthesis of N,N'-diphosphanyl-functionalized NHC ligands andtheir coordination chemistry. The novel stable and rigid tridentate N,N'-diphosphanyl-imidazol-2-ylidene was synthesized and experimental and computational information on its stability weregained. It served as a unique platform for the synthesis of novel mono-, di-, tri-, penta-, hexanuclear complexes with the coinage metals (Cu, Ag and Au), exhibiting rare structural features. The mono- and dinuclear complexes with one or two dangling P-donors provided rational access to heterotrinuclear complexes. All these coinage metal complexes have short metal-metalseparations, indicating the presence of d10-d10 interactions, and display excellent luminescentproperties. Partial or complete transmetallation of the homotrinuclear Cu or Ag complexes withPd(0) precursors led to hetero-trinuclear complexes with d10-d10 interactions. In addition to itsbridging behavior, this ligand also showed its chelating behavior in Pd or Cr(III) complexes. Thelatter displayed superior performance in ethylene oligomerization than the Cr(II) complexes andgave mostly oligomers
Ottenwaelder, Xavier. « Coupleurs ferromagnétiques : aspects géométrique, topologique et électrochimique ». Paris 11, 2001. http://www.theses.fr/2001PA112326.
Texte intégralThis work concerns the synthesis and the study of dinuclear complexes capable of anchoring other complexes at their periphery to form polynuclear compounds. Two pathways towards the target to input of a ferromagnetic coupling in the initial complexes have been developed. The first part is dedicated to the static approach where the properties of the complexes cannot be tuned after synthesis. 1) A dinucleating ligand whereby the two magnetic orbitals are orientated in a quasiperpendicular fashion leads to a feeble ferromagnetic coupling. With this synthon hexanuclear complexes were obtained. 2) The topological aspect of the interaction is inspected through a mecanism based on spin polarisation. Biscopper(II) complexes in meta or para positions of benzenic rings lead to differently coupled systemes. The ions are highly coupled despite the large separation between them. Polynuclear compounds containing 6, 9 and 16 Cu(II) ions have been isolated from the meta substituted derivatives and they all retain the ferromagnetic coupling. .