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Academic literature on the topic 'Azométhine'
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Journal articles on the topic "Azométhine"
Smets, G., and A. Delvaux. "Azométhines et halochromie." Bulletin des Sociétés Chimiques Belges 56, no. 1-4 (September 1, 2010): 106–33. http://dx.doi.org/10.1002/bscb.19470560112.
Full textRombaut, J., and G. Smets. "Azométhines III Dérivés Du Furfuraldéhyde." Bulletin des Sociétés Chimiques Belges 58, no. 10-12 (September 1, 2010): 421–31. http://dx.doi.org/10.1002/bscb.19490581002.
Full textDissertations / Theses on the topic "Azométhine"
Taquet, Alizée. "Évolution de la résistance aux insecticides au sein d’un complexe d’espèces de ravageurs dans un contexte d’invasion biologique : coût de la résistance et rôle de l’hybridation." Thesis, La Réunion, 2020. http://www.theses.fr/2020LARE0014.
Full textBemisia tabaci is a major insect pest distributed worldwide because of its ability to transmit phytoviruses. Three whitefly species coexist in Reunion Island: the native species IO, and two exotic species MEAM1 and MED-Q, which successively invaded the island in 1997 and 2010. The main control strategy against these species is the use of insecticides, which can lead to the emergence of resistance. The main objective was to understand the evolution of the distribution of the whitefly species, with regards to their insecticide resistance in a context of interspecific hybridization. To this aim, whiteflies were sampled in 56 sites, genotyped at 11 microsatellite markers and for two kdr loci involved in pyrethroid resistance. Fifteen populations were phenotyped for resistance to pymetrozine and acetamiprid using bioassays, and the cost of acetamiprid resistance was evaluated in MEAM1 populations displaying different resistance levels. The two invasive species are mainly found in agroecosystems and both have kdr resistance mutations. Most of the MEAM1 populations were also found to be resistant to acetamiprid, pymetrozine or both pesticides. No fitness costs appeared to be associated with resistance to acetamiprid in MEAM1. On the contrary, the indigenous species IO was mainly sampled in non-crop areas, or at the edge of agrosystems. It has no pyrethroid resistance mutations and is sensitive to the insecticides tested. Finally, the interspecific hybridization (MEAM-IO) observed between IO and MEAM1 did not lead to the introgression of resistant mutations into the indigenous species, but possibly to the introgression of susceptibility in MEAM1
Bourgeaux, Marie. "Thiophènes azométhines : étude de composés modèles pour des matériaux fonctionnels." Thèse, 2008. http://hdl.handle.net/1866/6566.
Full textSkalski, Thomas. "Développement de composés conjugués en étoile de première génération incluant des liens azométhines et études électrochimiques et photophysiques." Thèse, 2012. http://hdl.handle.net/1866/9743.
Full textConjugated materials are been used in many applications and fundamental research, owing in part to their high degree of conjugation. They further have opto-electronic properties that are compatible for use as conjugated materials in many devices including solar cells, organic field effect transistors, organic light emitting diodes and electrochromic devices. The latter are of particular interest because their colors that can be changed when a potential is applied. The advantage of these color switching materials compared to other opto-electronic devices is their simple fabrication that can be done under ambient conditions. Electrochromic devices have found many consumer applications including mirrors, tunable windows, camouflage and electronic paper, to name a few examples. The focus of our research group is the preparation of new conjugated materials based on azomethine. Previous efforts from the group demonstrated that azomethines having the required properties for use in electrochromic devices (electrochemical reversibility and air stability) were possible when using a 2,5-diaminothiophene derivative as a building block. It was also demonstrated that color tuning of both the neutral and oxidized states was possible when coupling 2,5-diaminothiophene with various heterocyclic arylaldehydes. Despite the many examples of azomethines studied in our group, fundamental structure-property relationships of these conjugated materials are still not understood. The objective of this thesis was therefore to prepare to new conjugated azomethines from triarylamine aldehydes. The objective was also to examine the opto-electronic properties of these novel azomethines, including the effect of the degree of conjugation and type of triphenylamine aldehyde precursor on the absorbance, electrochemical properties, and fluorescence.
Pérez, Guarín Sergio Andrés. "Synthèse et caractérisation photophysique et électrochimique d'une nouvelle classe de composés à base de fluorène et 2-thiophène." Thèse, 2007. http://hdl.handle.net/1866/7839.
Full textAl, Ahmad Abdel. "Modulation des propriétés de surfaces par des liaisons réversibles." Thesis, 2019. http://hdl.handle.net/1866/24149.
Full textAzomethines incorporate covalent bonds that can be reversibly formed between an amine and aldehyde. This reversibility can be exploited to exchange their constitutional components. The intrinsic properties of the azomethines can be modulated by exchanging either the amine or the aldehyde components. Exchanging the constitutional components is possible in solution. However, the exchanged products must be purified to remove the various reagents and undesired exchanged products. It is therefore advantageous to simplify the purification step for isolating the desired exchanged product. A possible means towards this goal is by immobilizing either the amine or the aldehyde on a surface. In such a case, the desired exchanged products can be readily isolated by rinsing the surface following the dynamic component exchange. Towards this end, an electroactive aldehyde monomer derived from triphenylamine was prepared. It was thermally polymerized on a transparent electrode. Polymerization was confirmed by FT-IR ATR and Raman spectroscopies. A series of amines (aminocoumarin and diaminobenzothiadiazole) each with a unique color, emission wavelength and electrochemical oxidation potential were chosen. Their azomethine formation and dynamic exchange with the electroactive aldehyde thin film could therefore be tracked electrochemically, by UV-visible and Raman spectroscopies, and by fluorescence. Model compounds of these azomethine fluorophores were also prepared for benchmarking their electrochemical and spectroscopic properties along with confirming component exchange. It was shown that multiple properties (redox potentials, color, emission wavelength, and emission yield) of the electroactive film could be simultaneously modulated by reversible azomethine formation. By immobilizing the azomethines on a surface, their properties could be reversibly modified by component exchange by either dipping the substrate in an amine solution or coating the surface with a spray of amine followed by rinsing. This straight-forward process provides the means for developing surfaces whose properties can be perpetually modified, while opening the possibility of repairing the surface and restoring desired properties by dynamic component exchange.
Gautier, Yohan. "Etude électrochimique et spectro-électrochimique de nouveaux composés électrochromes." Thesis, 2019. http://hdl.handle.net/1866/23928.
Full textIntensive research on conjugated materials over the past few decades has highlighted the plethora of opto-electronic properties that these can present. Their compatibility with various electronic devices make them alternatives to inorganic materials, and the fact that they open the path to plastic electronics assures that research about them is not about to diminish soon. Use of azomethine links instead of “all-carbon” vinylene-type double bonds, for the design and conception of conjugated molecules, is a very interesting alternative to the conventional methods, not very eco-friendly, usually employed, mostly due to their relative simplicity in terms of synthesis and purification. Following on previous work, this thesis aim to analyze the electro and spectro-electrochemical properties of a series of new azomethine-oligomeres that are functionalized with amides. Particular emphasis is placed on their electrochromism.. The influence of various electro-donating and electro-attracting groups in the core of the molecules as well as at their termini on the optical and electrochemical properties is presented. The emphasis is placed on demonstrating their robustness and the durability of their color change when undergoing multiple oxidation-neutralization cycles.
Lerond, Michael. "Fonctionnalisation d'électrodes par greffage électrochimique et assemblage de dispositifs électrochromiques à base de triphénylamines." Thèse, 2017. http://hdl.handle.net/1866/20041.
Full textBishop, Sophie. "L’impact de l’unité centrale sur les propriétés optoélectroniques d’imino-thiophènes électrochromes : s ynthèse et caractérisation." Thèse, 2013. http://hdl.handle.net/1866/11735.
Full textTshibaka, Tshitundu. "Synthèse des matériaux électroactifs à base de thiophènes et de bipyrroles dissymétriques." Thèse, 2011. http://hdl.handle.net/1866/8332.
Full textThe condensation of amine and aldehyde functional groups is an attractive strategy for the synthesis of conjugated, conductive polymers. Unlike conventional coupling techniques that give a mixture of products, selective product formation affording unsymmetric products is possible by controlling the reagent stoechiometry and solvents. A series of such polymers 17-23 (chapter 3) were synthesized by the dehydration of aminothiophenes and a series of asymmetric bisaldehydes 8-13 (chapter 3) featuring an asymmetric 4-methoxy-2,2'-bipyrrole core. The latter was constructed by a general route from 4-hydroxyproline providing derivatives 1-2 (chapter 2) and 3-6 (chapter 3), which were diformylated in the last step to afford the bisaldehyde monomers 8-13 (chapter 3). In the search for functional materials, the electrochromic properties of polymers 17-23 (chapter 3) were evaluated.
Ces travaux ont été réalisés en collaboration avec le groupe du professeur William Skene.
Bourque, Alex N. "Photophysical Investigations of Thiophene Azomethine Derivatives." Thèse, 2009. http://hdl.handle.net/1866/3565.
Full textA series of sterically hindered thiophene-aniline azomethine dyads were prepared. The decay pathways that deactivate the singlet excited state were studied using UV-vis fluorescence and phosphorescence, laser flash photolysis and quantum calculations. Stern-Volmer relationships, derived from singlet and triplet state quenching experiments, showed that azomethines efficiently deactivate the singlet and triplet excited states of fluorophores with bimolecular kinetics. AM1 Semi-empirical quantum calculations examining the effect of bulky substituents on the bond rotational barriers demonstrate that bulky tert-butyl groups attached to the aniline moiety have less influence on the N-aryl bond rotation barrier than alkyl substitutions do on the thiophene-CH bond rotation barrier. Rehm-Weller calculations based on electrochemical potentials demonstrate that azomethines self-quench their excited states via fast and efficient intramolecular photoinduced electron transfer leading to complete fluorescence suppression. Metal complexes containing an azomethine ligand were also prepared. The ligand contains a hydroxyquinoline moiety linked with a thiophene ring. Photophysical investigations of the resulting metal complexes demonstrated significant bathochromic shifts in the absorbance and fluorescence spectra. Metal-ion sensing devices for water solutions were prepared by spin casting the ligand onto glass slides. The metal-ion sensor detected copper in water solutions through a bathochromic shift in the absorbance maximum.