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Artykuły w czasopismach na temat "Degrés d'oxydation"
BETTAHAR, N., Z. DERRICHE, F. ABRAHAM i P. CONFLANT. "Etude par diffraction des rayons x et spectroscopie des photoelectrons de l'environnement et des degres d'oxydation du metal dans les oxydes: PbPtO, PbPtO ET BiPbPtO." Annales de Chimie Science des Matériaux 25, nr 4 (maj 2000): 297–306. http://dx.doi.org/10.1016/s0151-9107(00)80006-9.
Pełny tekst źródłaAubertin, N., N. Neveux, R. Gerardin i O. Evrard. "Synthèse d'un sulfatoferrate de potassium et son efficacité dans le traitement des eaux". Revue des sciences de l'eau 9, nr 1 (12.04.2005): 17–30. http://dx.doi.org/10.7202/705240ar.
Pełny tekst źródłaRozprawy doktorskie na temat "Degrés d'oxydation"
Hilaire, Sandrine. "Etude de la stabilisation des hauts degrés d'oxydation des actinides". Paris 11, 2005. http://www.theses.fr/2005PA112031.
Pełny tekst źródłaEarly actinides (U, Np, Pu, Am) in a high oxidation state show a particular linear structure in bonding with pi-donor ligands (O, NR,. . . ). The diminution of the charge on the metallic centre due to the electronic donation from the equatorial and axial ligands allow the existence of high oxidation states for the light actinide. The particularity of the actinide stands in the fact that An 5f orbitals can take part in chemical bonding because of a partial delocalisation. In order to understand this behaviour, a study of the electronic and the geometric structure is undertaken using both theorical and experimental approaches : - Modelling of geometry and IR vibrational frequencies of compounds with formula AnO2L2n+(H2O)3 (An= U(VI) 5f0, Np(V) 5f2, Np(VI) 5f1 and Np(VII) 5f°, L=CI-, Br-, F-, CO32- and OH-) were performed by the density functional theory (DFT) using Gaussian and ADF software. Bond population and molecular orbitals composition were essentially studied. - Hydroxide, carbonate and oxalate of Neptunium (+V) and (+VI) were synthesized with the aim to study the electronic properties by different experimental way: magnetism susceptibility (SQUID), Mossbauer, XPS measurements and vibrationals spectroscopy's. - Uranium studies are focused on the water free compounds UO2Cl2(THF)3, UO2(OPPh3)4(Otf)2 and UO2(OTf)2, exhibiting more covalent bonds in the equatorial plane
Dinoi, Chiara. "Complexes oxyde de molybdène et de tungstène dans les hauts degrés d'oxydation en milieu aqueux : synthèse, réactivité et catalyse d'oxydation". Toulouse 3, 2007. http://thesesups.ups-tlse.fr/120/.
Pełny tekst źródłaAfter a bibliographic introduction on the aqueous chemistry of high oxidation state Mo and W organometallic oxido complexes (chapter I), chapter II describes the reduction of [Cp2Mo2O5] in organic media with the thiols R-SH (R = iPr, Et, tBu). The undesired decomposition of [Cp2Mo2O5] in the presence of water has turned our efforts toward the study of the analogous [Cp*2Mo2O5] and [Cp*2W2O5] complexes, highly stable in aqueous media as already reported in the literature. In chapter III, a new synthesis of [Cp*2Mo2O5] and [Cp*2W2O5] is presented, high yields being respectively achieved in only two steps. Chapter IV reports studies of the chemical reactivity of [Cp*2Mo2O5] towards selected functionalized mercaptanes in aqueous media. With SHCH2COOH (mercaptoacetic acid) a spontaneous reduction affords the [Cp*2Mo2(micron-SCH2CO2)2(micron-S)] complex, whereas in the presence of HSCH2CH2COOH (mercaptopropionic acid), the oxido compound [Cp*2Mo2(micron-SCH2CH2CO2)2(micron-O)] is formed. .
Cachia, Jean-Nicolas. "Solubilité d'éléments aux degrés d'oxydation III et IV dans les verres de borosilicate". Montpellier 2, 2005. http://www.theses.fr/2005MON20165.
Pełny tekst źródłaKappenstein-Grégoire, Anne Cécile. "Caractérisation physico-chimique des solutions aqueuses de nitrate de neptunium aux degrés d'oxydation (IV) et (V)". Paris 6, 2001. http://www.theses.fr/2001PA066318.
Pełny tekst źródłaBesson, Claire. "Huat degrés d'oxydation du ruthénium et ligands polyoxométallates : du transfert d'azote à l'oxydation catalytique de l'eau". Paris 6, 2009. http://www.theses.fr/2009PA066350.
Pełny tekst źródłaGondouin, Serge. "Caractérisation in situ des degrés d'oxydation III et VI du chrome à l'état solide par spectrométrie de masse LAMMA". Metz, 1986. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/1986/Gondouin.Serge.SMZ8618.pdf.
Pełny tekst źródłaThe chromium in its oxudation states is known as being able to be carcinogen for man his environment. In consequence it is necessary to characterize perfectly these oxidation states and particularly in stainless steel fumes. The methodology developed hier is based on result obtaind in the course of analyses either of pure compounds (oxides or salts) or of compounds on support or included in matrices. From this study conclude that cluster ions formed in micro-plasma are representative of chemical environment of the studied element. In the same way we could evidenced the effect of compounds hydratation of these ionized clusters. For each sample type, we make up a histogram elementary ions repartition for cluster ions (negative characteristic of sulfate, nitrate. . . Ions). In all cases we verified the composition determination with several other techniques such as E. S. C. A. , I. R. T. F, R. X. And Raman. Our results allowed to conform the LAMMA analysis, evidencing advantages and limits on each one
Sakout, Mohammed. "Contribution de la spectrométrie X à l'étude des degrés d'oxydation du vanadium et du chrome dans les oxydes mixtes de structure spinelle". Rouen, 1989. http://www.theses.fr/1989ROUES002.
Pełny tekst źródłaAharonian, Ghazar. "Reactivité de dérivés moléculaires du niobium et du tantale dans les degrés d'oxydation III à I avec des ligands assembleurs : complexes imido et diiminés". Nice, 1988. http://www.theses.fr/1988NICE4177.
Pełny tekst źródłaPagliarini, Olivio. "Chimie moléculaire du niobium et du tantale dans les degrés d'oxydation IV à II : synthèse et réactivité d'alcoxydes du tantale et du bis(cyclopentadienyl)niobium (II)". Nice, 1987. http://www.theses.fr/1987NICE4131.
Pełny tekst źródłaBaranov, Alexeï. "Apport de la spectroscopie Mössbauer à l'étude des phénomènes électroniques et structuraux au sein de réseaux oxygénés renfermant un élément de transition à un degré d'oxydation élevé". Bordeaux 1, 2007. http://www.theses.fr/2007BOR13449.
Pełny tekst źródłaThis thesis is devoted to the study of electronic phenomena, structural and magnetic transitions through Mössbauer Spectroscopy using 57Fe as local probe (1 to 2% at. ). Three different matrixes have been selected: (i) the nickelates TNiO3 with the perovskite structure (T=rare-earth, Y, Tl), (ii) the copper 3+ oxides: LaCuO3 with the perovskite structure, SrLaCuO4 and La2Li0. 50Cu0. 50O4 with the K2NiF4-type structure, (iii) the oxide CaMn7O12 with a structure derived from the perovskite (CaMn )(Mn Mn4+)O12 where a Jahn-Teller cation (Mn3+) can occupy the A site. Mössbauer spectroscopy has allowed to underline the following electronic and structural phenomena: (i) for the TNiO3 matrixesthe insulationmetal transition, the disproportionation, the magnetic ordering involving two Ni3+ electronic configurations; (ii) for the Cu3+ Oxides: the charge transfert Cu3+ O Cu2+ OL; (iii) in the case of CaMn7O12 matrix two phenomena: a second order structural transition (rhomboedral cubic) (387T455 K), a second order magnetic transition close to 90 K