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Dissertations / Theses on the topic 'Manganese carbene complexes'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Martin, Thomas Antony. "Unravelling the photochemistry of organometallic N-heterocyclic carbene complexes." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547630.

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This thesis describes the synthesis, characterisation and reactivity of new manganese and rhenium(I) NHC complexes, which have been investigated both thermally and photochemically and the results contrasted with existing phosphine analogues in the literature. Cp’Mn(CO)2(NHC) (NHC = IEt2Me2 1, IMes 2, IiPr2Me2 3 and IPr 4) were synthesised and investigated by TRIR spectroscopy. Loss of CO was observed after 355 nm irradiation to form agostically stabilised intermediates, which reformed the parent species by recombination with CO on the nanosecond timescale. Loss of NHC was not observed, in cont

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2

Johnson, Tony Richard. "Vinylidene and cyclic carbene chemistry of iron and manganese half-sandwich complexes." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340247.

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3

Van, der Westhuizen Belinda. "Synthetic investigation of Mn(I) and Re(I) N-heterocyclic carbene complexes." Diss., University of Pretoria, 2010. http://hdl.handle.net/2263/25922.

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The study involves synthetic approaches towards the preparation of novel NHC complexes of low valent rhenium and manganese transition metals. Diverse methods of synthesis were studied. The direct approach, in which the ylidene obtained from deprotonation of 1,3-bis(2,4,6- trimethylphenyl)imidazolium chloride was added to the metal substrate, proved to be unsuccessful as isolation of the free carbene should rather be performed in an argon filled glove box under extreme inert conditions. By way of further investigation the ylidene was prepared by in situ methods and then quenched with the metal

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4

Deetlefs, Maggel. "Carbene and coordination complexes of gold, palladium, platinum and manganese derived from N-containing heterocycles." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52155.

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5

Zheng, Jianxia. "Earth-abundant metal complexes for catalyzed hydroelementation." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S148/document.

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Ce travail de recherche est consacré au développement de catalyseurs à base de métaux de transition abondants de la première rangée du tableau périodique, tels que Mn, Fe, et Ni, pour les réactions d'hydro-élémentation. Tout d'abord, l'hydrosilylation de cétones et d'aldéhydes a été accomplie en utilisant un système catalytique simple Ni(OAc)₂ 4H2O/PCy₃ avec le PMHS, silane peu coûteux et stable en tant que source d'hydrure. L'amination réductrice d'aldéhydes avec des amines a également été réalisée avec le même système catalytique et le TMDS, comme silane. Deuxièmement, l’efficacité des compl

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6

Hemming, Oliver. "Structure and reactivity of low-coordinate first-row transition metal complexes." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/structure-and-reactivity-of-lowcoordinate-firstrow-transition-metal-complexes(a7879b58-897e-4080-99f6-8551511a503a).html.

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Earth-abundant first-row transition metals have seen a renaissance in chemistry in recent years due to their relatively low toxicity and cost in comparison to precious metals. Furthermore open-shell transition metal complexes exhibit useful one-electron redox processes which contrasts to their heavier d block anologues. This thesis aims to synthesize and analyse the structure and reactivity of low-coordiante first-row transition metal complexes of from groups 7-9 with an aim to utilize these species in catalysis. The divalent compound [Co{N(SiMe3)2}2] reacts with the primary phosphines PhPH2 i

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7

Michon, Christophe. "Réactivité de complexes cyclomanganés vis-à-vis de différents diazoalcanes : vers des poly-hélices organométalliques et une nouvelle voie de synthèse de dérivés du cymantrène." Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13112.

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Le travail de cette thèse de doctorat a porté sur l'étude de la réactivité des complexes cyclomanganés vis-à-vis de différents diazoalcanes. La réaction de complexes monocyclomanganés vis-à-vis de diazoalcanes non-cycliques a d'abord été explorée en examinant la sélectivité des réactions menées dans des conditions de thermolyse. Cette nouvelle réaction s'effectue facilement en ajoutant un diazoalcane à une solution de complexe cyclomangané chauffé au reflux sous un flux d'argon. Un carbène du manganèse est ainsi généré in-situ dans des conditions douces et neutres. Son insertion dans la liaiso

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8

Dubarle, Offner Julien. "Novel heterobimetallic manganese-chromium and rhenium-chromium complexes : coordination, cyclometallation, benzannulation and haptotropic metal migration." Paris 6, 2009. http://www.theses.fr/2009PA066040.

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Une propriété caractéristique des complexes formés par des métaux de transition et des ligands polycycliques aromatiques est leur capacité à se soumettre à des réarrangements haptotropiques ; le fragment métallique est considéré comme le groupe fonctionnel déplaçable qui migre entre deux cycles non-équivalents du ligand hydrocarboné. Nous avons décidé de coordiner d’autres métaux de transition aux complexes (polyarène)Cr(CO)3 afin d’étudier leurs différentes influences sur la migration du tricarbonylchrome. Dans ce contexte, les premiers complexes hétérobimétalliques syn et anti Cr(CO)3-Mn(CO)

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9

Chai, Jianfang. "Synthesis, structure and reactivity of manganese complexes supported by carbon or nitrogen donor ligands." Doctoral thesis, [S.l. : s.n.], 2004. http://webdoc.sub.gwdg.de/diss/2004/chai/chai.pdf.

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10

Chu, Wai-cheung. "Syntheses and reactions of copper and manganese complexes of tetradentate polyanionic chelating ligands and their applications in carbon-heteroatom bond formation reactions /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19324893.

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11

Frantz, Eric Benjamin. "Synthesis, reactivity, and coordination chemistry relevant to the copolymerization of CO2 and epoxides by first row transition metal schiff base complexes." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2893.

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12

Sarmeo, David. "Insertion de chlorure de manganèse dans les fibres de carbone (ex-mésophase de brai) à l'aide de complexes gazeux : application au dosage de l'énergie thermique." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0191.

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Le procede de conversion thermochimique de l'energie a basse et moyenne temperature base specialement sur la reaction d'absorption de l'ammoniac gazeux (nh#3) par le chlorure de manganese (mncl#2) permet de stocker une grande quantite d'energie et ainsi de liberer d'une facon intermittente, des calories et des frigories. Ce systeme avantageux comporte neanmoins deux incovenients majeurs dus a la formation des ammoniacates au cours de la reaction. En effet, ces derniers possedent une faible conductivite thermique limitant les transferts thermiques au sein du reacteur et subissent un phenomene d

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13

Lorett, Velasquez Vaneza Paola Verfasser], Matthias [Akademischer Betreuer] Westerhausen, and Alexander [Akademischer Betreuer] [Schiller. "Synthesis of ruthenium and manganese carbonyl complexes : a search for new carbon monoxide releasing molecules (CORMs) / Vaneza Paola Lorett Velasquez. Gutachter: Matthias Westerhausen ; Alexander Schiller." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2014. http://d-nb.info/104709696X/34.

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14

Trillat, Jean-Frédéric. "Réduction de NO par CO sur catalyseurs bimétalliques Pd-Mn : application à la conversion de mélanges complexes en post-combustion automobile (moteurs à essence)." Lyon 1, 1997. http://www.theses.fr/1997LYO10029.

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Des catalyseurs pd-mn supportes sur silice ont ete prepares par impregnation des bis-acetylacetonates de pd et mn dissous dans le toluene. Les precurseurs impregnes ont ete etudies par xrd et exafs ; il a ete montre que seuls les composes mn adsorbes perdent un ligand acetylacetone. Apres impregnation, les ligands organiques sont elimines par decomposition sous ar a 773 k. Le tem montre que ce traitement conduit a la formation de petites particules metalliques, bien dispersees sur le support. Cependant la spectroscopie ir indique que du carbone reste sur le metal. De ce fait, il est preferable

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15

Bezuidenhout, Daniela Ina. "Synthesis and Structural Investigations of manganese carbene complexes." Diss., 2006. http://hdl.handle.net/2263/28193.

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The study involves the synthesis and structural characterization of manganese carbene complexes. The synthesis of dimanganese monocarbene complexes [Mn2(CO)9{C(OEt)(heteroaryl)}] was done via the classical Fischer method, and a range of complexes containing heteroaromatic substituents, e.g. 2,2'-bithiophene, thiophene, furan and N-methyl pyrrole, was isolated. These complexes displayed a novel configuration with the carbene ligand in the axial position, in contrast to the equatorial position found for the analogous rhenium compound and other dimanganese complexes known from the literature. The

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16

Pinto, M. F. "Manganese and Iron Complexes with H-heterocyclic Carbene Ligands: Synthesis and Catalysis." Doctoral thesis, 2020. http://hdl.handle.net/10362/97198.

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"This thesis describes the synthesis of new manganese and iron complexes bearing N-heterocyclic carbene (NHC) ligands and their application in catalysis. In particular, we have explored the catalytic activity of the new metal complexes in the oxidation of alcohols and in the reduction of carbonyl groups.(...)"

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17

Huang, Po-Wei, and 黃柏瑋. "Synthesis and Charactrization of Manganese(I) Carbonyl N-Heterocyclic Carbenes(NHCs) / Phosphine(PR3) Complexes." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/35971125548269474166.

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碩士<br>淡江大學<br>化學學系碩士班<br>104<br>N-Heterocyclic carbenes(NHCs) is an important ligands in organometallic chemistry. The NHCs are electron-rich; good σ-donor ligands, and the donating ability of NHCs can be altered by modified the azole ring. The NHCs can effective bind to matal to give a stabe structure. As well as NHCs , Phosphine (PR3) ligands is a σ-donor , the donating ability can be tuned by the cone angles. Therefore, we can modify the steric and electron effect of N-Heterocyclic carbenes and Phosphine ligands. When it coordinated to metal center. In this study, The Bis(pentacarbonylmanga

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18

Chai, Jianfang [Verfasser]. "Synthesis, structure and reactivity of manganese complexes supported by carbon or nitrogen donor ligands / vorgelegt von Jianfang Chai." 2004. http://d-nb.info/973984600/34.

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19

Poland, Ross Rivers. "Advances in Synthesis of Co- and Ter- Polycarbonates and Polyesters from Non-Petroleum Feedstocks and Kinetic Studies of Ligand Substitution from Manganese Half-Sandwich Complexes." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10906.

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This dissertation is written in two parts. The first pertains to polycarbonate and polyester synthesis using relatively benign processes. The synthesis of polycarbonates from the coupling of CO2 and epoxides catalyzed by transition metal catalysts has long been studied in the DJD group. The benefits of this process are that it utilizes comparatively benign reagents, can be performed using no extraneous solvent, and is 100% atom efficient. A method potentially useful for achieving more desirable polycarbonate properties is to produce an epoxide A/epoxide B/CO2 terpolymer, thus allowing more

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20

Varade, Ashish. "MOCVD Of Carbonaceous MnO Coating : Electrochemical And Charge Transport Studies." Thesis, 2009. http://hdl.handle.net/2005/999.

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Metalorganic Chemical Vapour Deposition (MOCVD) is a versatile technique for the deposition of thin films of oxide materials as it offers advantages, such as deposition over large surface area, conformal coverage, selective area deposition, and a high degree of compositional control. The MOCVD process uses metalorganic (MO) complexes, such as β-diketonate and alkoxide-based complexes, as precursors. These complexes are stable and moderately volatile. Because of the direct bond between metal and oxygen, MO complexes are natural precursors for oxide coatings. As the process involves chemical rea

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