No / The design and synthesis of a potentially more therapeutically-viable azinomycin analogue 4 based upon 3 has been completed. It involved coupling of a piperidine mustard to the acid chloride of the azinomycin chromophore. Both the designed azinomycin analogue 4 and the natural product 3 bind to DNA and cause unwinding, supporting an intercalative mode of binding. Graphical abstract A designed analogue of the left half of azinomycin has been synthesized and unwinds supercoiled DNA.

no / The structure of 2,7-dibromocryptolepine acetic acid solvate, C16H11N2Br2 [1.5(C2H4O2)][C2H3O2 -] [0.5H2O], Mr = 460.17, has been determined from X-ray diffraction data. The crystals are monoclinic, space group P21/c with Z = 4 molecules per unit cell and a = 7.3243(3), b = 18.7804(6), c = 15.8306(7) A ° , b = 94.279(1) , Vc = 2171.5(2) A ° , crystal density Dc = 1.667 g/cm3. The structure was determined using direct methods and refined by full-matrix least-squares to a conventional R-index of 0.0496 for 4,908 reflections and 258 parameters. The cryptolepine nucleus of the 2,7-dibromocryptolepine molecule is highly planar and the two Br atoms are in this plane within 0.06 and 0.01 A ° , respectively. The crystal structure is maintained via hydrogen bonding between N(10) in the cryptolepine nucleus and the oxygen of one of the three solvated acetic acid molecules. The acetic acid molecules also form hydrogen bonded chains. Acetic acid B is deprotonated and its two C¿O bond lengths are equivalent, unlike those in A and C. Acetic acid C lies very close to a crystallographic centre of symmetry. To avoid overlap the two repeats cannot exist together and are subject to 50% statistical disorder. O(1C) of this methanol is furthest from the two-fold axis and its occupancy refines to a value of 1.0 and is assumed to exist alternately as a water oxygen hydrogen bonding to methanol O(1C) across the two-fold axis at a distance of 2.775 A ° .

no / The structure of 5-N-hydroxyethanequindoline hydrochloride methanolate, C17H15ON2 Cl·½CH3OH, M r = 314.78, has been determined from X-ray diffraction data. The crystals are monoclinic, space group C2/c, with Z = 8 molecules per unit cell and a = 18.179(11), b = 7.317(5), c = 24.125(15) Å, β = 110.155(10)°, V c = 3012(3) Å3, crystal density D c = 1.388 Mg m−3. The structure was solved by direct methods, and the asymmetric unit comprises the 5-N-hydroxyethanequindoline hydrochloride and ½CH3OH moiety. The methanol is unusually disordered over a twofold axis with the C atom slightly removed from the twofold axis. Restraints were applied to the bond lengths of the two components of the disordered CH3OH, and to the anisotropic thermal displacement parameters of the disordered CH3OH carbon atom. The heterocyclic quindoline ring system and the first C atom of the hydroxyethane side chain are planar within 0.02 Å, with the terminal C–OH atoms of the side chain significantly out of the plane. The crystal structure is maintained via three hydrogen bonds all involving the chlorine atom an oxygen in the hydroxyethane side chain, a nitrogen in the quindoline moiety and the methanol oxygen.

no / Reversible addition–fragmentation chain transfer (RAFT) polymerisation was used to produce a range of polymers terminated with an acridine group, which intercalates efficiently into dsDNA; the structure of the polymer determines the nature and strength of the interaction. Using a short 63 base pair dsDNA, discrete and well-defined DNA–polymer hybrid nanoparticles were formed, which were characterised by dynamic light scattering, small-angle X-ray scattering and atomic force microscopy. / University of Warwick, EPSRC, Swiss National Science Foundation

L’intercalation de molécules organiques dans les Hydroxydes Doubles Lamellaires conduit à la formation d’hybrides organo-minéraux lamellaires aux propriétés originales. La valorisation de ces matériaux pour des applications diverses nécessite d’une part, le développement d’une méthode de synthèse simple et efficace pour garantir la pureté des hybrides, et d’autre part, d’établir les relations composition-structure (feuillet cationique, anion et eau interfoliaire). C’est pour atteindre ces deux objectifs, que nous avons menés les travaux présentés dans ce mémoire. La stratégie de synthèse adoptée dans ce travail de thèse nous a permis d’obtenir des taux d’intercalation meilleurs que ceux obtenus par les autres méthodes (coprécipitation, reconstruction, etc.) pour des molécules organiques simples (acides dicarboxyliques) ainsi que pour des molécules plus complexes (acides aminés et oligopeptides). Les acides aminés sont classés en trois groupes selon leur taux d’intercalation, qui est influencé par la chaîne latérale des acides aminés. Ainsi, la distance interfoliaire et les défauts d’empilements augmentent avec la longueur de la chaîne, alors que la diminution de la charge du feuillet contribue à la contraction du domaine interfoliaire et à une meilleure structuration du matériau, en lien avec l’orientation des anions. On peut noter que l’effet de la charge du feuillet sur la distance interfoliaire pour les hybrides est l’inverse de celui observé pour les anions inorganiques. L’hydratation du matériau joue également un rôle clé sur l’orientation des anions interfoliaires et la structuration du matériau. Ainsi, la déshydratation du matériau favorise les orientations couchées des anions en augmentant les interactions anion-feuillet, ce qui augmente la stabilité de l’hybride et favorise sa structuration. Nous avons également montré que la présence des groupements amine favorise les interactions anion-feuillet. Aussi, le changement d’orientation des acides aminés intercalés nécessite une exposition des matériaux à des humidités relatives plus élevées que pour les anions dicarboxylates. En outre, nous avons vérifié l’intercalation préférentielle des anions avec des densités de charge élevées. En conséquence, les acides aminés se retrouvent intercalés sous forme totalement déprotonée quelle que soit la charge du feuillet. Enfin, ce mémoire propose une ouverture sur la réactivité des hybrides synthétisés. Celle-ci est abordée au travers d’exemples portant sur la décomposition d’espèces en milieu confiné et sur l’interaction avec le CO2 atmosphérique / The intercalation of organic molecules within the interlayer domain of Layered Double Hydroxides leads to the formation of organo-mineral hybrids with original properties. The industrial applications of these materials requires on one hand to develop a simple and efficient method of synthesis to ensure a high purity of these hybrids, and on the other hand to establish their structure-composition relationships (cationic layer, anion, and interlayer water). These are the objectives that motivated the work presented in this manuscript. The strategy of synthesis adopted in this work, allowed us to obtain higher rates of intercalation than those obtained by other methods (coprecipitation, reconstruction, etc.), for simple organic molecules (dicarboxylic acids) as well as for more complex molecules (amino acids and oligopeptides). The amino acids are classified into three groups according to their rate of intercalation, which is influenced by the nature of their side chain. Additionally, the interlayer distance and stacking faults are influenced by the length of the molecular chain and by the anion orientation which in turn depends on the density charge of the layer. Interestingly, the effect of the density charge on the interlayer distance for the hybrids is the opposite of what is observed for the inorganic anions. The hydration state of the system plays also a key role in the reorientation of the interlayer anions and on the material structuring. In particular, the dehydration of the material promotes lying orientations of the interlayer anions in the order to maximize the anion-layer interactions. This enhances the stability of the material and reduces the number of stacking faults. We have also showed that the presence of amino groups strengthens the anion-layer interactions and the reorientation of the anions occurs at higher humidity compared to dicarboxylate anions. Furthermore, we have verified the preferential intercalation of anion species with high charge densities. Therefore, the intercalated amino acids are found totally deprotonated in the interlayer domain regardless of the layer charge density. Finally, the reactivity of the hybrids is probed through two examples, one dealing with the thermal decomposition of the intercalated anions in confined medium, and the other dealing with their interaction with atmospheric CO2

L’étude cinétique a permis de déterminer le temps d’équilibre atteint lors de la fixation du benzopurpurine 4B sur chaque composé, ainsi que l’ordre de la réaction et la nature du mécanisme de diffusion. Cette adsorption est favorisée par un milieu légèrement basique, et l’augmentation de la température a un effet positif sur l’amélioration des performances maximales de la fixation. L’étude des isothermes d’adsorption de ce colorant, a été établie pour déterminer l’efficacité de cette nouvelle classe d’adsorbants. Ces dernières sont de type L, et les donnés de sorption ont été traitées selon plusieurs modèles, afin de mieux comprendre le mécanisme d'adsorption du colorant sur les différents matériaux. L’analyse des résultats de l’étude thermodynamiques a montré que l’adsorption du colorant sur les différents composés est un phénomène spontané, endothermique et favorable, régie par une adsorption physique pour les matériaux CoFe-CO3/Ec, CoFe-CO3/A et MgAl-CO32- et par une adsorption physico-chimique pour les matériaux CoFe-Ac/p, CoNiFe-Ac/p , et MgAl-500. Ces résultats ont été confirmés par les analyses DRX et IR des différents matériaux avant et après adsorption. En comparant les résultats obtenus pour l’adsorption du colorant sur les différents matériaux, le composé CoNiFe-Ac/p constitue le meilleur adsorbant avec une capacité d’adsorption d’environ 593mg/g. Par conséquent, et compte tenu de l’ensemble des résultats fournis par cette étude, l’hydrolyse forcée en milieu polyol, s’avère une méthode très efficace pour l’élaboration des hydroxydes doubles lamellaire à base de métaux de transition avec une morphologie contrôlée, de taille nanométrique présentant un faible taux d’agglomération, et par conséquent une bonne dispersion de particules et un meilleur pouvoir adsorbant. Ces caractéristiques peuvent être à l’origine de l’application de ces matériaux avec succès dans l’élimination des colorants contenant dans les effluents industriels. / New layered double hydroxides (LDHs) CoFe-Ac, CoNiFe-Ac, ZnNiFe-Ac and ZnCoFe-Acwith MII/MIII molar ratio of 3, and acetate ions in the interlayer region have been preparedusing forced hydrolysis of acetate metallic salts in a polyol medium. The structure,morphology and properties of as-prepared product were investigated by X-ray Diffraction(XRD), FT-IR Spectroscopy, elemental analysis, transmission Electron Microscopy (TEM),Scanning Electron Microscopy (SEM), thermal analysis (DTA, TGA) and V-visibleSpectroscopy: showed that these nanocomposites present the typical features of hydrotalcitelikestructure, exhibit a turbostratic character and the intercalation of acetate anions into theinterlayer domain has been successfully done, giving an interlayer spacing value of 12.70,12.47, 13.64 and 14.69 Å for CoFe-Ac, CoNiFe-Ac, ZnNiFe-Ac and ZnCoFe-Acrespectively.We can note that there is some difference between the interlayer spacing for all synthesizedphases. That can be explained by the arrangement of inserted species (anions + water) indifferent orientation in the interlayer domain.57Fe Mössbauer spectrometry allows concluding the presence of Fe3+ cations which occupyoctahedral sites and confirming the absence of Fe2+ in the as-prepared compounds.In order to check the capacity of our materials synthesized in polyol medium to exchange theacetate anions inserted in their interlamellar space, anionic exchange in aqueous medium waseffected for CoFe-Ac compound as à model of synthesized LDH. All the physicochemicalmethods of analysis (DRX, IR, ATD/ATG and elemental analysis) carried out on the materialCoFe- Ac /EC (exchanged). The comparison with a lamellar phase containing oFeCO3/Asynthesized in aqueous medium, show a layered double hydroxide compound with aturbostratic disorder, and a new interlamellar distance d003 = 7.67Å which correspondsperfectly with the presence of the carbonate anions and the water molecules in the interfeuilletfield.In the second part of this study, we are interested to examine the capacities of these kinds ofmaterials for the adsorption of an anion dye benzopurpurine-4B-. The adsorption of direct red2 by CoFe-Ac, CoNiFe-Ac LDHs has been examined in order to measure the capability ofthis new organic/inorganic nanomaterial to eliminate this highly toxic azoic class of anionicdyes from wastewater. The sorption capacities of LDHs for Benzopurpurine4B are also compared with those of other adsorbents : CoFe- Ac /Ec, CoFeCO3/A (synthesized in aqueous medium), Mg-Al-CO3/A and its calcined product at 500°C “Mg-Al-500”. The quantity of dye eliminated was found to depend on contact time, pH, initial concentration of dye and heating temperature. The thermodynamic parameters ΔG°, ΔH° and ΔS° werecalculated to predict the nature of adsorption. Results suggested that the Benzopurpurine 4B adsorption on different compounds was a spontaneous and endothermic process. Adsorption kinetic data were tested using pseudo-first order, pseudo-second order, Elovitch’sequation and intra-particle diffusion models. Kinetic studies for all cases showed that the adsorption followed a pseudo-second order reaction. Studies revealed that intra-particle diffusion played an important role in the mechanism of dye adsorption by MgAl-500. Theequilibrium data were analyzed using Langmuir, Freundlich, Tempkin, Elovitch, Dubinin-Radushkevich, Redlich-Peterson and Toth isotherm models. [...] Taking these results into account, we can conclude that prepared LDHs by forced hydrolysis in a polyol medium can be used successfully in the removal of anionic dyes from aqueous solutions.

Dix molécules organiques modèles simulant les fonctions chimiques des superplastifiants utilisés dans la formulation des bétons ont été intercalées dans les hydrates cimentiers lamellaires conduisant à la formation de phases AFm hybrides. Les interfaces entre les deux sous-réseaux organiques et inorganiques de ces composés hybrides ont été étudiées afin de caractériser les interactions entre hydrates cimentiers et adjuvants organiques lors de la prise du béton. Les affinités de ces molécules vis-à-vis du feuillet minéral ont pu être comparées et il en ressort les deux séries suivantes : -PO32- > -SO3- > -CO2- pour les parties hydrophiles et C7-R > Φ-R > C5-R > C2-R pour les parties hydrophobes. L’interface organique-inorganique i.e. le mode d’accrochage et l’orientation de la molécule organique au sein de l’espace interlamellaire ont principalement été caractérisés par DRX sur poudre et spectroscopie infrarouge. Différents modes de connexion ont pu être identifiés par intercalation et par greffage. Les molécules organiques examinées sont ainsi orientées soit perpendiculairement, soit parallèlement aux feuillets associés à différents mode d’accroche. Différents taux d’hydratation de ces hydrants hybrides ont ensuite été identifiés et un travail de résolution structurale sur la phase insérant l’anion C6H5SO3- a permis de préciser l’organisation structurale de l’espace interlamellaire. Finalement, une étude sur l’intercalation de quelques superplastifiants commerciaux a mis en évidence un phénomène d’exfoliation de ces hydrates lamellaires. L’étude préalablement réalisée sur des molécules modèles permet alors de mieux comprendre les interactions se produisant au sein du milieu complexe que constitue un béton frais. / Ten organic molecules models simulating the chemical functions of superplasticizers used in concretes formulation were intercalated into lamellar cement hydrates to synthesize hybrid AFm phases. The interfaces between the organic and inorganic networks of these hybrid compounds have been studied to characterize the interactions between cementitious hydrates and organic additives in concrete. The affinities of these molecules toward the mineral layers have been compared and display the following tendencies : -PO32- > -SO3- > -CO2- for the hydrophilic parts and C7-R > Φ-R > C5-R > C2-R for the hydrophobic parts. The organic-inorganic interface (connection mode and orientation of the organic molecule) of the hybrid AFm phases was characterized by powder WRD and infrared spectroscopy. Organic molecules are oriented either perpendicular or parallel to the sheets resulting from different connection modes mainly intercalation and also grafting. The various hydration levels of these hybrids hydrates were then determined, and a structural resolution was attempted on AFm inserting C6H5SO3- anion allowing a description of its interlayer structure. Finally, a study on the intercalation of some commercial superplasticizers highlighted the exfoliation phenomenon for these lamellar hydrates.The present study on model molecules leads to a better understanding of the interactions occuring in complex fresh concrete environment.

Les batteries à ions lithium alimentent la plupart des petits appareils électriques, portables. Elles font usage du graphite comme électrode négative. Pour optimiser celle-ci, il faut réduire la perte spécifique de charge du premier cycle d’intercalation du lithium. Cette perte est principalement due à la formation d’une couche passive par décomposition de l’électrolyte. Les propriétés du graphite qui l’influencent sont partiellement connues. En particulier, une meilleure compréhension de l’exfoliation du graphite, responsable d’une grande perte spécifique de charge, est souhaitée. Ce phénomène est provoqué par la co-intercalation de solvant à travers les plans de bord des particules. Des paramètres comme la cristallinité, la chimie de surface et la réactivité du graphite semblent jouer un rôle. Une étude systématique a été entreprise afin de déterminer leur influence sur le premier cycle dans un électrolyte standard à base de carbonate d’éthylène et de diméthyle. Il apparaît que les complexes de surface oxygénés ne jouent pas de rôle particulier tandis que les complexes hydrogénés favorisent la co-intercalation de solvant. De plus, les graphites ayant une faible teneur en sites actifs constituant l’Active Surface Area (ASA), mesurée par chimisorption d’oxygène, sont plus enclins à exfolier. Comme les atomes de bord à deux voisins sont les plus réactifs en raison de la présence d’un électron célibataire, la plus grande sensibilité à la co-intercalation de solvant des graphites de faible ASA peut s’expliquer par la formation d’une couche passive inappropriée sur des plans de bord peu réactifs laissant passer le solvant. / In the field of small portable electrical devices, lithium-ion batteries are common. Graphite is used as the negative electrode. To improve its electrochemical performances, the first cycle specific charge loss must be decreased. It is predominantly attributed to the electrolyte reduction into a passivation layer. The graphite properties which influence this charge loss are not clearly identified. In particular, the graphite exfoliation which is responsible for a huge specific charge loss must be better understood. This dramatic phenomenon is due to solvent co-intercalation through the particle edge planes. Many graphite parameters such as crystallinity, surface chemistry and reactivity are thought to play a role. A systematic study was carried out in which the influence of each parameter on the first cycle was assessed in a standard ethylene and dimethyl carbonate based electrolyte. It appears that the presence of oxygen surface complexes does not have any influence whereas C6H bonds cause slight exfoliation. In addition, graphite samples containing low amount of active sites : the so-called Active Surface Area (ASA), quantified by oxygen chemisorption, are more likely to exfoliate. Since graphite active sites are mainly the edge atoms because of unpaired electron presence, low ASA graphite exfoliation can be explained by the formation of inappropriate passivation layer on the edge planes letting solvent molecules co-intercalate.

No description available.

Foram realizadas pesquisas em uma série de condutores iônicos que apresentam aplicações na área dos dispositivos eletroquímicos de estado sólido, utilizando-se basicamente a técnica de Ressonância Magnética Nuclear (RMN). A primeira parte deste trabalho é dedicada aos compostos de intercalação baseados na matriz de dissulfeto de molibdênio (MoS2) onde as espécies intercalantes (íons de lítio e moléculas de aminas) são inseridas num espaço de dimensionalidade reduzida gerado pela matriz. Já a segunda parte envolve os condutores iônicos poliméricos do tipo compósitos, nos quais foram utilizadas nanopartículas de carbono (Carbon Black) e titânio (TiO2) no eletrólito formado pelo poli(óxido de etileno) (POE) e o perclorato de lítio (LiClO4). Todos estes sistemas apresentam, em geral, uma considerável complexidade estrutural, o que significa que os movimentos moleculares e de difusão iônica se produzem num meio semicristalino (caso dos compósitos) ou num meio de dimensionalidade reduzida (caso dos intercalados). A espectroscopia de RMN dos núcleos de 7Li e 1H é uma técnica conveniente para o estudo destes materiais, pois é possível avaliar, através dos resultados obtidos das medidas dos tempos de relaxação e formas de linha, os efeitos provocados pela baixa dimensionalidade dos movimentos em estruturas laminares (caso dos intercalados), bem como identificar e aferir as interações e os mecanismos de relaxação resultantes dos diferentes graus de liberdade dos movimentos (iônicos e moleculares), fornecer parâmetros estruturais (distâncias interatômicas) que auxiliam na proposta de possíveis modelos estruturais e caracterizar completamente a escala temporal dos movimentos iônicos e moleculares. / Nuclear Magnetic Resonance (RMN) techniques were used to study a series of ionic conductor materials, which present applications in the area of the solid-state electrochemical devices. The first part of this work is dedicated to the study of intercalation compounds based on the molybdenum disulfide matrix (MoS2), where the intercalated species (lithium ion and amine molecule) are inserted in the low-dimensionality space generated by the matrix. The second part involves the study of a composite polymer electrolyte, employing fillers like Carbon Black and titanium dioxide (Tio2) nano particles in the electrolyte formed by the poly(ethy1ene oxide) and a lithium salt (LiClO4). In general, these systems present a considerable structural complexity, meaning that the molecular movements and ionic diffusion are produced in a semicrystalline environment (case of the composites) or in an environment of reduced dimensionality (case of intercalates). The 7Li and 1H NMR spectroscopy is a convenient technique for the study of these materials. Relaxation time and line shape measurements may provide a tool to investigate the effects provoked by the low-dimensionality of the movements in laminate structures (case of intercalate), to identify the interactions and relaxation mechanisms of the ionic and molecular motions, to supply structural parameters (interatomic distances) that would help the proposal of possible structural models, and finally, to characterize the time scale of the ionic and molecular movements completely.