Добірка наукової літератури з теми "Flavonoïdes – Dérivés – Propriétés optiques"
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Статті в журналах з теми "Flavonoïdes – Dérivés – Propriétés optiques":
Allou Isidore, SARAKA, ABO Kouabenan, OUATTARA Katinan Etienne, and ZIRIHI Guédé Noël. "Étude botanique, tri phytochimique et évaluation in vitro de l’activité antifongique des extraits de feuilles de Mallotus oppositifolius (Geisel.) Müll. Arg (Euphorbiaceae) sur Fusarium sp. et Phytophthora sp. deux champignons phytopathogènes." Journal of Animal & Plant Sciences 41.2 (August 31, 2019): 6903–15. http://dx.doi.org/10.35759/janmplsci.v41-2.4.
Дисертації з теми "Flavonoïdes – Dérivés – Propriétés optiques":
Labarrière, Luc. "Spectroscopic properties of environmental relevant systems : 2’,3-dihydroxyflavone-ion complexes and polycyclic aromatic hydrocarbons : a joint experimental and theoretical study." Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR069.
This manuscript reports the results of an experimental and theoretical study of two molecular systems of environmental interest: 2',3-dihydroxyflavone (2'3HF) and polycyclic aromatic hydrocarbons (PAH). These systems were studied by a combination of electronic spectroscopic techniques (absorption and fluorescence) and quantum chemical calculations (DFT and TD-DFT). In the first part of this thesis, it is shown that 2'3HF has singular acid-base properties compared to other flavonols. The decrease of the pKa by several units is attributed to the presence of a hydrogen-bond network. In the excited state, an intramolecular proton transfer causes a dual fluorescence. An additional emission band, seemingly originating from a tautomeric form perturbed by interaction with the solvent, was revealed. Finally, an exhaustive study of the Ca(II), Mn(II) and Zn(II) complexes showed the formation of chelates with the α-hydroxyketone function. In the second part, three structural hypotheses to explain the experimental observation of visible-range laser-induced fluorescence (LIF) were explored. A study of van der Waals (vdW) dimers of PAHs provided insights into the nature of the monomer interaction and highlighted the difficulty of modelling these systems. However, the calculated electronic transitions suggest that these species cannot be responsible for the LIF signals. Secondly, an identical study of aliphatically bridged PAHs showed very similar results to vdW dimers, ruling out their involvement in the observed fluorescence. Finally, the hypothesis of emission from PAH radicals was explored. The latter is very promising and opens the way for further experimental and theoretical studies
Sahraoui, Bouchta. "Propriétés optiques non-linéaires du troisième ordre dans des nouveaux dérivés du tetrathiafulvalène." Angers, 1996. http://www.theses.fr/1996ANGE0010.
Busch, Alexandrine. "Synthèse de dérivés de benzo- et pyridodiazines à propriétés optiques non linéaires potentielles." Rouen, INSA, 2005. http://www.theses.fr/2005ISAM0004.
Hergué, Noémie. "Nouveaux polymères conjugués dérivés de 4-cyano-3alcoxythiophènes et de dialcoxythiénothiophènes." Angers, 2007. http://www.theses.fr/2007ANGE0049.
This work deals with the synthesis of new polymers using alkoxythiophene derivatives. After a rapid review on the linear conjugated systems properties, a first part is devoted to the presentation of several polyalkoxythiophenes reported in literature. The electronic and structuring effects of the alkoxy groups on the properties og conjugated systems are demonstrated. The second part describes the synthesis of new donner/acceptor systems and the preparation of the resulting polymers. The introduction of electron releasing (alkoxy) and the electron withdrawing (nitrile) groups on the same thiophene ring is used to increase the electronic density homogeneity and to prepare low bandgap polymers. The last part is devoted to the synthesis of 3,6-dialkoxythiéno[3,2-b]thiophene and de 3,4-dialkoxythiéno[3,2-b]thiophene, wich associate the intrinsically rigid structure of thienothiophenes and the autorigidification due to the presence of alkoxy groups. The two structure leads to systems presenting very different properties, thus allowing the modulation of the electronic properties of the various conjugatede systems
Besson, Eric. "Elaboration de matériaux hybrides organiques-inorganiques à propriétés optiques." Montpellier 2, 2004. http://www.theses.fr/2004MON20104.
Drolet, Nicolas. "Étude de dispositifs électro-optiques à base de matériaux dérivés de l'unité 2,7-carbazole." Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23878/23878.pdf.
Wakim, Salem. "Elaboration de structures conjuguées chirales à partir de dérivés du trans (1R, 2R)-1,2-diaminocyclohexane. Evaluation des propriétés catalytiques et optiques." Montpellier 2, 2002. http://www.theses.fr/2002MON20018.
Tokumoto, Miriam Sanae. "Etude struturale des précurseurs, intermédiaires et colloi͏̈des dérivés de l'acétate de zinc et propriétés électriques, optiques et structurales des couches minces d'oxyde de zinc dopé au indium." Limoges, 2000. http://www.theses.fr/2000LIMO0037.
Yang, Zhixin. "Préparation et propriétés des polycarbosilanes comportant des groupements acétyléniques et aromatiques dans le squelette." Montpellier 2, 1992. http://www.theses.fr/1992MON20177.
Eid, Georges. "Nouveaux dérivés lipophiles ou amphiphiles de composés phénoliques bio-sourcés à propriétés antioxydantes, anti-inflammatoires et/ ou anti-prolifératives." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0166.
The decrease in easily accessible petrochemical resources has given over the past ten years a growing interest in the use of raw materials of renewable origin. The primary wood processing industry generates large amounts of waste each year which are currently either recycled to other sectors such as paper mills or the panel industry, or used as a source of energy, and therefore to markets with low added value. The project is situated in this context of sustainable development, circular economy and valorization of co-products of the wood industry by the exploitation of secondary metabolites present in wood, such as phenolic compounds, and more precisely flavonoids, which are indeed of interest in various fields because of their biological activities.The objective of this work is to functionalize accessible and abundant compounds in order to obtain polyfunctional compounds with 2-in-1 properties and thus be able to simplify cosmetic formulations. Functionalization has been considered by two routes: chemical hemisynthesis and/or enzymatic catalysis.By chemical hemisynthesis we were able to obtain bi-modular compounds by combining a fatty acid and a non-glycosylated flavonoid, in this case we worked with catechin. Direct acylations on the phenolic hydroxyls of catechin have been studied and the regioselectivity has been demonstrated by NMR spectroscopy and confirmed by molecular modelling. We have also obtained tri-modular compounds by chemical hemisynthesis by combining different amino acids, as well as fatty acids of variable length with catechin. Three different trimodular structures have been synthesized.By enzymatic hemisynthesis we have synthesized tri-modular compounds, from glycosylated flavonoids, rutin and narignin, aiming for the grafting of fatty acids of different chain lengths but this time on the glycosidic part of the flavonoids. We have also synthesized penta-modular compounds resulting from the grafting of a dicarboxylic acid on naringin or rutin. These compounds comprise two flavonoid entities grafted on either side of the carbon chain of the diacid.At the end of these syntheses, the physico-chemical properties of the products were studied, in particular their solubility in water, their anti-radical properties but also the surfactant properties. Some biological activities have also been studied such as antiproliferative activity against CaCo2 cells. In order to understand the effect of the structure of the compounds on their antioxidant capacity, molecular modeling work has been undertaken; correlations between the antioxidant activity of compounds determined experimentally and chemical reactivity descriptors calculated in silico were sought