Relevant bibliographies by topics / Manganese iii complexes

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Academic literature on the topic 'Manganese iii complexes'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Manganese iii complexes"

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Kuźniarska-Biernacka, I., A. Lisinska-Czekaj, D. Czekaj, M. José Alves, A. Mauricio Fonseca, and I. Correia Neves. "Styrene Epoxidation Over Heterogeneous Manganese(III) Complexes." Archives of Metallurgy and Materials 61, no. 3 (September 1, 2016): 1477–82. http://dx.doi.org/10.1515/amm-2016-0242.

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Abstract The manganes(III) complex functionalised with 2,3-dihydropyridazine has been encapsulated in the supercages of the NaY zeolite using two different procedures, flexible ligand and in situ complex. The parent zeolite and the encapsulated manganese(III) complexes were screened as catalysts for styrene oxidation by using t-BOOH as the oxygen source in acetonitrile. Under the optimized conditions, the catalysts exhibited moderate activity with high selectivity to benzaldehyde
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Varkey, Saji P., Chandra Ratnasamy, and Paul Ratnasamy. "Zeolite-encapsulated manganese(III)salen complexes." Journal of Molecular Catalysis A: Chemical 135, no. 3 (October 1998): 295–306. http://dx.doi.org/10.1016/s1381-1169(97)00307-5.

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Saltsman, Irena, Israel Goldberg, and Zeev Gross. "Water-soluble manganese(III) corroles and corresponding (nitrido)manganese(V) complexes." Journal of Porphyrins and Phthalocyanines 14, no. 07 (July 2010): 615–20. http://dx.doi.org/10.1142/s1088424610002434.

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Corroles that carry either two or three ortho-pyridyl groups at the meso-carbon atoms form stable manganese(III) complexes, from which corresponding water-soluble derivatives are obtained via N-alkylation. These syntheses and the spectroscopic features are disclosed, together with the molecular structure of the manganese(III) corrole that carries three ortho-pyridylium groups. All the manganese(III) corroles may be transformed to stable (nitrido)manganese(V) complexes, whose NMR spectra provide invaluable structural information regarding the identity and number of atropoisomers.
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Yamashita, Satoshi, Takuya Shiga, Masashi Kurashina, Masayuki Nihei, Hiroyuki Nojiri, Hiroshi Sawa, Toru Kakiuchi, and Hiroki Oshio. "Manganese(III,IV) and Manganese(III) Oxide Clusters Trapped by Copper(II) Complexes." Inorganic Chemistry 46, no. 10 (May 2007): 3810–12. http://dx.doi.org/10.1021/ic062258h.

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Lah, Nina, Sabina Grabner, and Peter Bukovec. "Two new mononuclear manganese(III) salen complexes." Acta Chimica Slovenica 62, no. 2 (June 15, 2015): 255–60. http://dx.doi.org/10.17344/acsi.2014.1022.

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Gangopadhyay, Sumana, Mahammad Ali, and Pradyot Banerjee. "Oxidation reactions of mononuclear manganese (III) complexes." Coordination Chemistry Reviews 135-136 (November 1994): 399–427. http://dx.doi.org/10.1016/0010-8545(94)80073-1.

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Burgess, J., D. L. Davies, A. J. Grist, J. A. Hall, and S. A. Parsons. "Solvatochromism of thiocyanato-tetraazamacrocycle-manganese(III) complexes." Monatshefte f�r Chemie Chemical Monthly 125, no. 5 (May 1994): 515–23. http://dx.doi.org/10.1007/bf00811843.

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Geisselmann, Andreas, Peter Klüfers, and Bernd Pilawa. "Binuclear Homoleptic Manganese(III,III) and Manganese(IV,III) Complexes with DeprotonatedD-Mannose from Aqueous Solution." Angewandte Chemie International Edition 37, no. 8 (May 4, 1998): 1119–21. http://dx.doi.org/10.1002/(sici)1521-3773(19980504)37:8<1119::aid-anie1119>3.0.co;2-l.

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Haas, Michael, Sabrina Gonglach, and Wolfgang Schöfberger. "Meso-alkynyl corroles and their cobalt(III), manganese(III) and gallium(III) complexes." Journal of Porphyrins and Phthalocyanines 24, no. 05n07 (May 2020): 737–49. http://dx.doi.org/10.1142/s1088424619501566.

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We report routes towards synthesis of novel [Formula: see text]-conjugated freebase cobalt, copper, gallium and manganese meso-alkynylcorroles. UV-vis spectra show that extensive peak broadening, red shifts, and changes in the oscillator strength of absorptions increase with the extension of [Formula: see text]-conjugation. Using density functional theory (DFT), we have carried out a first theoretical study of the electronic structure of these metallocorroles. Decreased energy gaps of about 0.3–0.4 eV between the HOMO and LUMO orbitals compared to the corresponding copper, gallium and manganese meso-5,10,15 triphenylcorrole are observed. In all cases, the HOMO energies are nearly unperturbed as the [Formula: see text]-conjugation is expanded. The contraction of the HOMO–LUMO energy gaps is attributed to the lowered LUMO energies.
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Pelletier, Yanick, and Christian Reber. "Single-crystal absorption spectroscopy of binuclear complexes of iron(III) and manganese(III) with the μ-oxo-bis(μ-acetato)dimetal core." Canadian Journal of Chemistry 73, no. 2 (February 1, 1995): 249–54. http://dx.doi.org/10.1139/v95-034.

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Single-crystal absorption spectroscopy at variable temperature is used to determine exchange couplings between transition metal centers in both the electronic ground and excited states in two new homobimetallic complexes with the formula [LM(μ-O)(μ-CH3CO2)2ML′](ClO4)2, where M is iron(III) or manganese(III). L and L' denote 1,4,7-triazacyclononane and 1,4,7-trimethyl-1,4,7-triazacyclononane, respectively. Values for the ground state exchange coupling constant J are −295 cm−1 and +10 cm−1 for the iron and manganese compounds, respectively, using Hex = −JS1•S2. Exchange interactions in excited states are qualitatively analyzed, indicating that a spin-forbidden transition of the Fe–Fe binuclear unit occurs with significant intensity by the single-ion mechanism, and not as expected by the Tanabe pair intensity mechanism for spin-forbidden transitions, the dominant mechanism for isoelectronic complexes of manganese(II). Keywords: absorption spectra, exchange interaction, magnetic properties, bimetallic complexes of iron(III), bimetallic complexes of manganese(III)
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Dissertations / Theses on the topic "Manganese iii complexes"

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Rolle, Clarence J. "Selective aerobic oxidations catalyzed by manganese(III) complexes using redox-active ligands." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42827.

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Selective oxidations are important for the functionalization of compounds in organic synthesis and chemical industry. Using O2 as a terminal e- acceptor would be ideal because it is cheap and environmentally friendly, but aerobic oxidations are often prone to unselective free radical autoxidation. Recently developed palladium catalysts use O2 as a selective multi-electron oxidant for various organic transformations. Although these methods are powerful and sophisticated, the lower cost of base metals makes them attractive as potential alternatives. The challenge is to develop methods for effecting multi-electron transformations at metals that typically prefer one electron changes. To this end, the development of manganese(III) complexes containing redox-active ligands as catalysts for selective oxidase-type oxidation of organic substrates was pursued. Bis(tetrabromocatecholato) manganese(III) complexes were shown to aerobically oxidize catechols to form quinones and H2O2. This reactivity was extended to other alcohol and amine substrates. In these reactions, the non-innocent tetrabromocatecholate ligands may impart a multi-electron character to the metal. To directly probe the intermediacy of ligand-centered radicals in catalytic turnover, a series of structurally similar manganese(III) complexes with aminophenol-derived ligands were prepared and characterized. The capacity of these ligands to undergo low-energy redox changes, allowed for isolation of an electron transfer series spanning two redox states without a change in oxidation state at the metal center. The ligand-centered redox events were a key feature in aerobic homocoupling of Grignard reagents.
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Theil, Sylvie. "Complexes polynucléaires du manganèse (II),(III), (IV). Synthèse, réactivité, propriétés magnétiques et structurales." Toulouse 3, 1993. http://www.theses.fr/1993TOU30078.

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Les resultats presentes dans ce memoire s'inscrivent dans le cadre de la modelisation du site de production d'oxygene du photosysteme 2. Neuf complexes du manganese ont ete prepares et etudies. L'oxydation par le dioxygene, en presence d'anions chlorures, de precurseurs a manganese (ii) renfermant les bases de schiff 3-meo-saldien, 3-meo-salept ou 3-meo-saldpt conduit aux complexes (mn#i#i#i(3-ch#3o-salen)(h#2o)cl),c#2h#4cl#2 (c#4), (mn#i#i#i(3-ch#3o-salen)(h#o)cl, 3h#2 o(c#5) et mn#i#i#i(3-ch#3o-salen)cl, c#2h#4cl#2 (c#7). Le mecanisme de degradation de ces ligands a ete etudie. C#4, c#5 et c#7 ont ete caracterises par diffraction des rayons x et leurs proprietes magnetiques ont ete analysees, conduisant a la mise en evidence de correlations magneto-structurales. Trois complexes (c#9 a c#1#1) presentant une formulation analogue: (mn#i#i#2l#n(ch#3coo)#2, ch#3oh)#2 (l#n=base de schiff renfermant un catecholate) ont ete isoles. La determination de la structure cristalline de c#9 illustre l'arrangement tetranucleaire lineaire resultant du pontage, par des oxygenes catecholates, de deux unites binucleaires equivalentes. Les proprietes magnetiques (rpe et variation thermique de la susceptibilite magnetique) indiquent une analogie structurale entre ces trois composes. Les complexes mn#i#i(pda), 1,5h#2o (c#1#2) et mn#i#i(pdal), h#2o (c#1#3) et celui a valence mixte ((hpda)mn#i#i#i(o)#2mn#i#v(pda)), 2h#2 o(c#1#4) ont ete prepares a partir de ligands tripodes tetradentes. Les interactions antiferromagnetiques faibles au sein de c#1#2 et c#1#3 sont caracteristiques d'especes mononucleaires associees par l'intermediaire d'un reseau de liaison hydrogene etendu. C#1#4 est caracterise par une interaction antiferromagnetique forte entre ions manganese (iii) et (iv) di-mu-oxo pontes (j=270 cm##1) et un signal rpe multiligne a seize raies semblable a celui observe pour le site a manganese du photosysteme 2
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Simonato, Jean-Pierre. "Chimie de coordination de la tétraméthylchiroporphyrine avec le fer(III), le cobalt(III) et le rhodium(III) : applications à l'analyse d'énantiomères d'amines, à la complexation énantiosélective d'aminoalcools, et à la catalyse d'aziridination asymétrique." Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10051.

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Des complexes metalliques de la tetramethylchiroporphyrine, de symetrie et possedant des groupements meso derives du biocartol, ont ete synthetises, caracterises, et utilises dans quatre axes de recherches. _la caracterisation du complexe bis-ethanol de la tetramethylchiroporphyrine de fer(iii), en solution et en phase solide, revele que ce compose presente un etat de spin inhabituel : le spin intermediaire pur (s = 3/2). _l'insertion d'un metal diamagnetique, le cobalt(iii), coordonnant les amines au cur de la porphyrine, a permis l'analyse qualitative et quantitative de la composition de derives d'amines par resonance magnetique nucleaire du proton. Cette methode s'est averee precise, fiable, rapide et tres facile d'utilisation. _l'addition de -aminoalcools sur cette meme molecule resulte en la complexation preferentielle d'un enantiomere. Les aspects cinetiques et thermodynamiques ont ete abordes, et une explication quant a l'enantioselectivite observee est avancee sur la base de liaisons hydrogene intramoleculaires de type c-h___o. _parmi differentes complexes de la tetramethylchiroporphyrine, ceux de fer(iii) et de manganese(iii) ont donne les meilleurs resultats pour la catalyse d'aziridination asymetrique, avec des exces enantiomeriques allant jusqu'a 57% pour le styrene. Un point remarquable est l'induction asymetrique opposee de ces deux catalyseurs, chacun favorisant la formation majoritaire d'un enantiomere.
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Kwong, Ka Wai. "Visible-Light Generation of High-Valent Metal-Oxo Intermediates and a Biomimetic Oxidation Catalyzed By Manganese Porphyrins with Iodobenzene Diacetate." TopSCHOLAR®, 2016. http://digitalcommons.wku.edu/theses/1743.

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High-valent iron-oxo intermediates play central roles as active oxidants in enzymatic and synthetic catalytic oxidations. Many transition metal catalysts are designed for biomimetic studies of the predominant oxidation catalysts in Nature, the cytochrome P450 enzymes. In this work, a new photochemical method to generate high-valent iron-oxo porphyrin models was discovered. As controlled by the electronic nature of porphyrin ligands, iron(IV)-oxo porphyrin radical cations (Compound I model) and iron(IV)-oxo porphyrin derivatives (Compound II model) were produced. These observations indicate that the photochemical reactions involve a heterolytic cleavage of O-Br in precursors to give a putative iron(V)-oxo intermediate, which might relax to Compound I through electron transfer from porphyrin to the iron or undergo rapid comproportionation reaction with residual iron(III) to afford the Compound II derivative. Furthermore, visible light photolysis of bis-porphyrins-dimanganese(III)-μ-oxo complexes, [MnIII(Por)]2O, was studied in three porphyrin systems. Direct conversion of manganese(III)-μ-oxo dimers to manganese(IV)-oxo porphyrins [MnIV(Por)(O)] and manganese(III) products was observed in benzene solution upon light irradiation. The spectral signature of [MnIV(Por)(O)] was further confirmed by production of the same species in the reported reaction of the [MnIII(Por)Cl] with PhI(OAc)2. Continuous irradiation of bis-porphyrins-dimanganese(III)-μ-oxo complexes in the presence of pyridine or triphenylphospine gave rise to the formation of [MnII(Por)(Py)] or [MnII(Por)(PPh3)], which are stable to be detected. A photo-disproportionation mechanism similar to that for bis-porphyrins-diiron(III)-μ-oxo complex was proposed to explain above photochemical behaviors of bis-porphyrins-dimanganese(III)-μ-oxo complexes. With iodobenzene diacetate [PhI(OAc)2] as the oxygen source, manganese(III) porphyrin complexes exhibit remarkable catalytic activity towards the selective oxidation of alkenes and activated hydrocarbons. Conspicuous is the fact that the readily soluble PhI(OAc)2 in the presence of a small amount of water is more efficient oxygen source than the commonly used PhIO under same conditions. High selectivity for epoxides and excellent catalytic efficiency with up to 10,000 Turnovers (TONs) were achieved in alkene epoxidations. A manganese(IV)-oxo porphyrin was observed in the oxidation of the manganese(III) porphyrin and PhI(OAc)2. However, catalytic competition and Hammett studies suggested that the more reactive manganese(V)-oxo intermediate was favored as the premier active oxidant, even it is too short-lived to be detected in the catalytic reaction.
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Mabad, Bouchra. "Modelisation du site d'oxydation de l'eau en photosynthese : complexes du manganese avec des bases de schiff polydentees." Toulouse 3, 1987. http://www.theses.fr/1987TOU30103.

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Pérollier, Céline. "Synthèse de nouvelles métalloporhyrines chirales à substituants cyclopropaniques : applications en catalyse d'époxydation asymétrique et en reconnaissance moléculaire d'enantiomères." Université Joseph Fourier (Grenoble ; 1971-2015), 1998. http://www.theses.fr/1998GRE10191.

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Le biocartol ou acide (1r)-cis-hemicaronaldehydique, un compose cyclopropanique enantiopur provenant de la synthese industrielle d'insecticides pyrethroides, est utilise comme synthon pour la preparation de nouvelles porphyrines chirales. Nous decrivons la synthese d'amides du biocartol, puis la synthese des porphyrines correspondantes par condensation avec le pyrrole. Celles-ci sont obtenues exclusivement sous la forme de l'atropoisomere , avec un rendement variant de 7 a 60%. Une serie de complexes de manganese (iii) de ces chiroporphyrines, derivees d'amides et d'esters du biocartol, ont ete prepares. Ces complexes sont de bons catalyseurs pour l'epoxydation asymetrique d'olefines prochirales. Les substrats a structure rigide cyclique sont epoxydes avec la plus grande selectivite. Ainsi, des exces enantiometriques allant jusqu'a 86% ont ete obtenus pour l'epoxydation du 1,2-dihydronaphtalene en (1s, 2r)-epoxy-1,2,3,4-tetrahydronaphtalene. L'influence de differents facteurs (nature des substituants, solvant, ligand axial, metal) sur la reactivite et l'enantioselectivite ont ete etudies. Des etudes structurales par resonance magnetique nucleaire et par diffraction des rayons x ont permis d'etablir une correlation entre structure et induction asymetrique dans cette serie. Nous avons mis en evidence que l'encombrement sterique au niveau du centre metallique lors de l'epoxydation est le determinant principal de l'enantioselectivite. Ces resultats sont interpretes par un modele geometrique de l'approche de l'olefine vers le centre metallique. La complexation d'amines derivees d'olefines prochirales par les chiroporphyrines de cobalt (iii) a egalement ete etudiee.
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Ourari, Ali. "Étude de deux réactions d'électrocatalyse : hydrogénation électrocatalytique sur des films de polymères contenant des microparticules de métaux nobles et activation de l'oxygène par des complexes Mn(III) - bases de Schiff." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10171.

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Ce travail est relatif a l'etude de deux reactions d'electrocatalyse. La premiere partie concerne la mise au point de cathodes moleculaires, realisees par l'inclusion de microparticules de metaux nobles dans des films de polypyrrole fonctionnalise et a leur application en hydrogenation electrocatalytique. L'etude de l'hydrogenation de deux substrats test, le limonene et la carvone, a montre qu'il est possible d'orienter la selectivite de ces electrodes modifiees selon la nature du metal incorpore (pt, pd ou rh). Le resultat le plus significatif est que l'incorporation dans le meme film de polymere de deux metaux d'activite catalytique differente (pt + pd ou rh + pd) conduit a des cathodes dont l'efficacite et la selectivite sont largement superieures a celle des cathodes basees sur un seul metal. La deuxieme partie de ce travail est consacree a l'etude de l'activation electrochimique de l'oxygene par des complexes mn (iii) - bases de schiff. Il apparait que le complexe mn (ii) - salen substitue en 5,5 par des atomes de chlore est le catalyseur le plus stable et le plus efficace pour la reaction test d'epoxydation du cyclooctene. D'autre part, la rigidification du complexe par l'utilisation d'un pont 1,2-cyclohexylidene ou 1,2-phenylene reliant les deux motifs salicylaldehyde du ligand, a la place du groupe ethylidene ligand salen, entraine une forte diminution de l'activite catalytique des complexes correspondants. Ce systeme electrocatalytique a egalement ete applique a l'oxydation de la tetraline et de la triphenylphosphine
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Arndt, Anderson. "Síntese, caracterização e estudo da ação neurotóxica de complexos de manganês(III) em Danio rerio." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/46/46134/tde-27022010-095705/.

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O manganês (Mn) é um elemento químico abundante na natureza, principalmente em minérios e presente também em alimentos e na água. É o cofator de enzimas importantes, como a superóxido dismutase mitocondrial. Entretanto, mineradores e outras pessoas expostas a produtos manufaturados de Mn podem apresentar uma concentração excessiva desse metal no cérebro, adquirindo uma desordem neurológica similar ao mal de Parkinson conhecida por manganismo. Basicamente a neurotoxicidade do Mn pode estar associada com os vários estados de oxidação que ele pode alcançar, gerando espécies reativas de oxigênio durante a interconversão dessas espécies. Dessa forma, neste trabalho sintetizamos e avaliamos as propriedades pró-oxidantes e neurotóxicas de complexos de Mn(III) com desferrioxamina, [Mn(dfb)]; acetohidroxamato, [Mn(aha)3]; citrato, [Mn(cit)]; cloro-salen, EUK 8; e aceto-salen, EUK 108. Tais compostos são propostos como miméticos da SOD e/ou catalase, entretanto podem apresentar atividade pró-oxidante. Estes complexos foram caracterizados espectrofotometricamente (UV/Vis e IV) e por voltametria cíclica. Foram determinadas as absortividades molares dos complexos [Mn(aha)3], EUK 8 e EUK 108. Os EUK\'s apresentaram dois processos redutivos, sendo apenas um reversível, enquanto o [Mn(cit)] apresentou apenas um processo redutivo reversível e os hidroxamatos [Mn(dfb)] e [Mn(aha)3] não apresentaram processos redox na faixa de potenciais utilizada. Em teste de lipofilicidade todos os complexos apresentaram maior afinidade pela fase aquosa, sendo muito pouco particionados para a fase orgânica. Através do ensaio de supressão de fluorescência de calceína foi possível estabelecer que os EUK\'s são relativamente mais estáveis do que os outros complexos, sendo o [Mn(aha)3] o menos estável dos compostos estudados. Nas análises de atividade pró-oxidante, o [Mn(dfb)] oxidou fortemente a sonda mesmo na ausência de outros cofatores, mas este processo é dependente da concentração de O2 no meio. Os EUK\'s atuaram como pró-oxidantes em função da concentração de peróxido no meio. A atividade pró-oxidante foi suprimida por ascorbato, glutationa e Trolox®, que agiram como antioxidantes, sugerindo implicações para a terapia do manganismo. O teste de toxicidade aguda em paulistinhas (Danio rerio) adultos resultou na mortalidade de alguns animais quando expostos a [Mn(dfb)] e [Mn(aha)3]. Comparando o telencéfalo de peixes expostos ao [Mn(dfb)] com um controle em microscópio, não se visualizou nenhuma alteração morfológica na região do núcleo dorsal, indicando que o complexo não causou nenhum dano visível nessa região.
Manganese (Mn) is an abundant element which is present also in food and water. It is the cofactor of important enzymes such as mitochondrial superoxide dismutase. However, miners and other occupationally exposed individuals may present an excessive load of Mn in brain and develop manganism, a neurological disorder akin to Parkinson Disease. Basically, Mn neurotoxicity may stem from its wide redox cycle, generating reactive oxygen species in the process of converting from one oxidation state to another. Thus, in this work we synthesized and evaluated the pro-oxidant and neurotoxic characteristics of Mn(III) complexes with desferrioxamine, [Mn(dfb)]; acetohydroxamate, [Mn(aha)3]; citrate, [Mn(cit)]; chlorosalen, EUK 8; and aceto-salen, EUK 108. Such compounds are proposed as mimetics of superoxide dismutase and/or catalase, however they may also be prooxidant. These complexes were characterized spectrophotometrically (UV/Vis and IR) and by cyclic voltammetry. Molar absorptivities were determined for [Mn(aha)3], EUK 8 and EUK 108. EUK\'s displayed two reductive processes, only one of which was reversible, while [Mn(cit)] displayed only one (reversible) reductive process and hydroxamates [Mn(dfb)] and [Mn(aha)3] did not display redox processes in the working range of potentials. Lipophilicity tests showed that all complexes have very low partition to the organic phase. Calcein fluorescence quenching studies showed that both EUK complexes are relatively more stable than the others, while [Mn(aha)3] is the least stable. In the pro-oxidant activity studies, [Mn(dfb)] strongly oxidized the fluorescent probe even in the absence of ancillary substances such as peroxide. However, this effect was dependant on O2 saturation in the solution. Both EUK acted as pro-oxidants with a linear dependence on peroxide concentration. Pro-oxidant activity was eliminated by the treatment with antioxidants such as ascorbate, glutathione and Trolox®, which is of interest for the therapy of manganism. In the acute toxicity tests induced some mortality in adult Danio rerio exposed to [Mn(dfb)] or [Mn(aha)3]. Comparison of the telencephalus of [Mn(dfb)]-exposed individuals with controls failed to indicate morphological alterations in the dorsal nucleus area, indicating that the complex did not affect visibly this brain region.
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Bonvoisin, Jacques. "Interaction d'échange dans des complexes polynucléaires de fer et de manganèse d'origine biologique ou synthétique : étude expérimentale et théorique." Paris 11, 1989. http://www.theses.fr/1989PA112133.

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Ce travail comporte trois parties. La première concerne l'étude magnétique de sites actifs de métallobiomolécules en utilisant un susceptomètre à SQUID. De par sa haute sensibilité, cet instrument permet de mesurer le signal paramagnétique de métalloprotéines en solution. Nous avons développé une méthodologie de ces mesures. Nous avons appliqué cette technique à des protéines fer-soufre comme la protéine Sulfite Réductase ou la protéine Ferrédoxine II et des protéines au fer à pont oxo comme la protéine Utéroferrine. Nous confrontons nos résultats à ceux obtenus par d'autres méthodes. Dans la deuxième partie de ce travail, nous exposons les propriétés magnétiques de complexes homo et hétérobinucléaires présentant le motif suivant [M(III)(μ - O)(μ -CH3CO2)2M'(III)]2+ avec M,M'=Fe,Fe; Fe,Mn ; Fe,Cr; Mn,Mn; V,V. Nous envisageons ensuite la relation entre les phénomènes d'échange et la liaison métal-métal en nous appuyant sur notre étude expérimentale d'un composé dinucléaire du Mn(IV) où les ions sont pontés par trois ligands μ-oxo. Enfin, dans la dernière partie, nous examinons la spectroscopie de systèmes polynucléaires à valence mixte au Mn(III) et Mn(IV) et élaborons différents modèles pour interpréter le spectre RPE multiligne observé pour l'état S2 du site de dégagement d'oxygène des plantes
This work is constituted of three parts. The first part involves magnetization studies of biomolecule metallic active sites using a SQUID susceptometer. Due to the high sensitivity of those new susceptometer, the paramagnetic signal of metallic centers of metalloproteins in solution can now be measured accurately. We developed new methods to achieve those measurements. We applied this technique to iron-sulfur proteins like Sulfite Reductase or Ferredoxine II and proteins containing two iron atoms bridged by an oxo group like Uteroferrin. We compare our results with those obtained by other methods. In the second part of this work, we present magnetic properties of homo and heterodinuclear compounds exhibiting the core [M(III)(μ - O)(μ -CH3CO2)2M'(III)]2+with M,M' = Fe,Fe; Fe,Mn; Fe,Cr; Mn,Mn; V,V. Then, we explore the relationship between exchange phenomena and metal­metal bonding using our experimental study of a Mn(IV) dinuclear compound where the two manganese atoms are bridged by three oxo groups. In the last part, we examine EPR spectroscopy of polynuclear Mn(III) and Mn(IV) compounds and build up various madel in order to interpret the multiline EPR spectra of the 82 state of the Oxygen Evolving Center of the Photosystem II of plants
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Cardoso, Mário Joaquim dos Santos. "Complexos de manganês com bases de Schiff : aplicação em catálise homogénea e heterogénea." Dissertação, Porto : [s.n.], 2003. http://catalogo.up.pt/F?func=find-b&local_base=FCB01&find_code=SYS&request=000072316.

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Books on the topic "Manganese iii complexes"

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Summers, Stephen P. Synthesis and properties of some bismuth (III), manganese (II), yttrium (III), europium (III), and gadolinium (III) complexes. 1994.

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Summers, Stephen P. Synthesis and properties of some bismuth (III), manganese (II), yttrium (III), europium (III), and gadolinium (III) complexes. 1994.

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Book chapters on the topic "Manganese iii complexes"

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) carbodithioate complex." In Magnetic Properties of Paramagnetic Compounds, 788–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_450.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with Acetylacetone." In Magnetic Properties of Paramagnetic Compounds, 1533–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_751.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex of monophenylbutazone." In Magnetic Properties of Paramagnetic Compounds, 1290–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_632.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with unsymmetrical Schiff-base." In Magnetic Properties of Paramagnetic Compounds, 1440–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_706.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with unsymmetrical Schiff-base." In Magnetic Properties of Paramagnetic Compounds, 1442–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_707.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with unsymmetrical Schiff-base." In Magnetic Properties of Paramagnetic Compounds, 1444–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_708.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with unsymmetrical Schiff-base." In Magnetic Properties of Paramagnetic Compounds, 1446–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_709.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex with unsymmetrical Schiff-base." In Magnetic Properties of Paramagnetic Compounds, 1448–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_710.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) complex of doubly-hydrated hexafluoroacetylacetone." In Magnetic Properties of Paramagnetic Compounds, 1278–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49202-4_626.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of manganese(III) chloro complex with dibenzotetramethyltetraaza[14]annulene." In Magnetic Properties of Paramagnetic Compounds, 587–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54228-6_329.

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Conference papers on the topic "Manganese iii complexes"

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Hurst, Antony M. "Structural Integrity Assessment to Justify Increase in Upper Operating Temperature Limit of AGR Dome." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66859.

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Abstract:
The UK advanced gas cooled reactors (AGRs) use a graphite core with carbon dioxide gas as the primary coolant. There is a diaphragm above the core which separates re-entrant gas at lower temperature and higher pressure from that leaving the channel guide tubes at reactor outlet temperature. This diaphragm is known as the hot box dome. The dome is perforated to facilitate the passage of fuel and control rods into the core. The dome is fabricated in carbon-manganese steel and incorporates a number of full penetration welds which are post-weld heat treated (PWHT). The dome’s upper surface is insulated to protect it from gas at high temperature, intended to maintain the dome at a temperature of below 380°C. Since dome failure could conceivably result in gas by-passing and, hence, failing to adequately cool the core the original safety case claims that gross failure of the dome is incredible. More recently potential failure modes of the dome have been reviewed and various dome weld failure scenarios have been analysed and assessed to demonstrate a tolerance to the consequences of complete failure of certain welds. On this basis the dome could be shown to satisfy a lesser classification of high integrity, although no claim to reclassify the region has been made. Through-life temperature monitoring is carried out to demonstrate that the peak dome temperature remains below 380°C. This has shown evidence of rising temperatures, believed to arise from a reduction in the effectiveness of the upper surface insulation, an effect that was acknowledged by the original design. Work to investigate this effect has developed the understanding of the dome thermal environment which is far more complex than previously thought. The hottest parts of the dome are far smaller and more localised than previously thought, and lie immediately above the monitored locations. In order to support a case to operate for an extended life, it is now proposed that the upper temperature limit could safely be increased to 390°C. Structural integrity analyses and assessments have been carried out to support the proposed increase to 390°C and include a demonstration of the absence of a cliff-edge effect by assessing cases with the hottest parts of the dome at temperatures of 400 and 410°C. The work seeks to demonstrate adequate margins of safety against all potential failure modes. ASME III code assessment against primary stress limits has been used to guard against failure by plastic collapse and/or creep rupture. Creep-fatigue initiation assessments have been used to demonstrate margins against the formation of defects using the EDF Energy high temperature assessment procedure, R5. This has enabled the consideration of potential defects to be confined to those that might have formed during welding or PWHT and have been missed by extensive pre-service inspections. Notwithstanding the low likelihood that any such defects exist, with high confidence it may be postulated that any that do would be located in welds and be of limited size. Defect tolerance assessments have been carried out, including the calculation of limiting defect sizes in accordance with the EDF Energy R6 procedure and the growth of postulated defects by creep and fatigue using R5. Other failure and degradations mechanisms have been considered and eliminated as a potential threat by drawing on reviews of relevant operating experience on other reactors with similar materials and environments, and material property data from long term tests. This paper describes how the multi-facetted programme of work, which proposes a modification to an existing safety case, has been devised to explicitly address all conceivable modes of failure and demonstrate a robust argument against each one.
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Reports on the topic "Manganese iii complexes"

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Liang, Wenchuan. Structural oxidation state studies of the manganese cluster in the oxygen evolving complex of photosystem II. Office of Scientific and Technical Information (OSTI), November 1994. http://dx.doi.org/10.2172/29428.

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