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Dissertations / Theses on the topic 'Hemilabile ligands'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Harkup, Kathryn. "Studies in tridentate hemilabile ligands and their metal complexes." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406977.

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2

Das, Uttam. "Iron Chemistry of Hemilabile SNS Ligands: Synthesis, Reactivity, and Catalytic Applications." Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37911.

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The development of abundant and economical first-row transition metal-based catalysts is an appealing area of research for efficient and selective chemical transformations. In this context, iron complexes are highly desirable as they feature a range of accessible oxidation states allowing for transfer of one or two electrons to or from a substrate. Therefore, over the past two decades, many iron-based catalysts have been developed, extensively studied, and exploited for catalysis ranging from oxidation and reduction to C-C bond forming reactions. In homogeneous transition metal catalys

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3

Matkovich, Kristin M. "Ruthenium and palladium halide complexes containing hemilabile ligands for luminescent chemosensing." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/13560.

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The effect of the halide ligand on the fluorescence lifetime of a series of Ru(II) complexes, tcc-RuX₂(POC4Pyr-P,O)₂ (X = Cl (3), Br (4), I (5)) containing the hemilabile phosphine ether ligand 4-{2-(diphenylphosphino)phenoxy}butylpyrene (POC4Pyr (1)), is reported. The synthesis and characterization of both the ligand, POC4Pyr (1), and ligand oxide, P(=O)OC4Pyr (2), and the solid-state structure of 1 are also presented. New complexes based on a similar framework incorporating phosphine pyrenyl imine and phosphine pyrenyl amine ligands and a palladium metal center, PdCl₂(PNPyr-P,N) (14) (PNP

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4

Raymakers, Maria de Fatima Marques. "Modelling of Grubbs type precatalysts with bidentate hemilabile ligands / Fatima Raymakers." Thesis, North-West University, 2012. http://hdl.handle.net/10394/9199.

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Metathesis is a valuable reaction for the production of new alkenes. In the last 50 years, heterogeneous as well as homogeneous catalysts have been used for this reaction. In the homogeneous category are the very successful catalysts designed by the Grubbs group. The first generation Grubbs precatalyst (Gr1) bearing two phosphine ligands was followed after extensive studies by the more active second generation Grubbs precatalyst (Gr2). In Gr2, one of the phosphine ligands is replaced with an N-heterocyclic carbene. Grubbs type precatalysts bearing pyridynyl-alcoholato chelating ligands are per

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5

Jong, Howard. "Late transition metal complexes incorporating hemilabile mixed-donor N-heterocyclic carbene ligands." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23473.

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The discovery of N-heterocyclic carbenes (NHC) has dramatically affected the world of catalysis. Their inherent properties that make them excellent auxiliary ligands for catalytic processes have countless laboratories worldwide probing and exploiting every notable feature they possess. However, while there is no shortage of attention in this field of research, there has been considerably less interest in NHCs with an ability chelate to metals via a mixed-donor ligand architecture. Thus, this thesis describes the synthesis and application of a ligand set comprised of bidentate mixed-donor NHC l

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6

Huijsmans, Carlijn Antonius Anne. "Modelling and synthesis of Grubbs-type complexes with hemilabile ligands / Carlijn Huijsmans." Thesis, North-West University, 2009. http://hdl.handle.net/10394/4242.

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Metathesis is a valuable method for the production of new alkenes and in the last 50 years a lot of catalytic systems for alkene metathesis were developed. In an earlier study, a Grubbs 2-type of catalyst was developed, which contained a N^0 hemilabile ligand with two aromatic R groups. This catalyst, which is called the Puk-Grubbs 2 pre-catalyst, showed an increase in stability, activity, selectivity and a longer lifetime in a 1-octene self-metathesis reaction in comparison to Grubbs 2. In order to improve these properties even further, variation in R groups of these Iigands were investigated

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7

Bagnol, Thibault. "Etude Fondamentale et Application en Catalyse de Métaux de Transition Précoces Complexés à de Nouveaux Ligands Hémilabiles contenant des Hétéroéléments." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0014.

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De récents travaux ont mis en évidence l’augmentation de l’activité catalytique des catalyseurs contenant un centre métallique électrophile induit grâce aux ligands. L’insertion d’un atome de bore dans ces complexes métalliques représente une approche pertinente pour augmenter la nature électrophile de ces complexes grâce aux propriétés intrinsèques de l’atome de bore. Cependant, peu d’exemples de tels complexes métalliques sont décrits dans la littérature. Au cours de cette thèse, nous nous sommes intéressés à de nouveaux ligands hémilabiles pour la catalyse en hydrofonctionnalisation via l’e

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8

Smit, Frans Johannes. "Modelling and synthesis of alicyclic bidentate n- and o chelating ligands / F.J. Smit." Thesis, North-West University, 2009. http://hdl.handle.net/10394/5021.

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The well-defined ruthenium-carbene complexes reported by Grubbs and co-workers were the first ruthenium catalysts to show good activity and selectivity in metathesis of acyclic and cyclic olefins. Unfortunately the use of the Grubbs type catalysts is limited to the small scale synthesis of polymers and essential organic reactions, due to cost and instability of the catalyst at elevated temperatures. Some of the most successful Grubbs-type catalysts included hemilabile ligands. By releasing a free coordination site (the so-called "on-demand-open-site") for an incoming nucleophile, hemilabile li

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9

Noack, Cassandra, and n/a. "Studies in Coordination Chemistry." Griffith University. School of Science, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20031030.145610.

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The research reported in this thesis was carried out in Brisbane, Australia and Calgary, Canada. The aim of the research conducted in Brisbane was to prepare a series of copper(I) and ruthenium(II) based complexes incorporating a hemilabile phosphine ligand and to determine whether or not these compounds possessed catalytic activity. The history, uses, properties and recent work incorporating hemilabile phosphine ligands is discussed in detail as well as the application of hemilabile ligands to atom transfer radical polymerization (ATRP) and the usefulness of the 'windscreen wiper' action of

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10

Pocquet, Lucrèce. "Ancrage supramoléculaire de complexes organométalliques dans la béta-lactoglobuline pour la catalyse asymétrique dans l'eau. Effet des ligands prochiraux hémilabiles." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066322/document.

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Ce travail de thèse est consacré à la conception de métalloenzymes artificielles. Un tel concept permet de combiner les avantages des catalyseurs enzymatiques et organométalliques, tels que la sélectivité catalytique élevée et l'efficacité des systèmes enzymatiques et la large portée de substrats des catalyseurs des métaux de transition. Notre approche repose sur l’utilisation de complexes de métaux de transition avec un ligand prochiral hémilabile, qui une fois insérés dans la protéine hôte sera forcé d’adopter une configuration spécifique. La chiralité sera ainsi amenée au plus près du centr

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11

Parera, Briansó Magda. "Transition metal-catalysed [2+2+2] cycloaddition reactions. Methodology and mechanism." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/145035.

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The transition-metal catalysed [2+2+2] cycloaddition reaction is a highly efficient synthetic tool that allows six-membered polysubstituted carbo- and heterocyclic derivatives to be obtained in an atom economy process. This doctoral thesis is based on methodological and mechanistic studies of the rhodium(I)-catalysed [2+2+2] cycloaddition reaction. In particular, the use of hemilabile S-stereogenic and P-stereogenic ligands for the rhodium-catalysed [2+2+2] cycloaddition is described. The activity of these new catalytic systems is evaluated in the cycloaddition of three alkynes and in the enan

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12

Lentz, Nicolas. "Metallylene-sulfur compounds : synthesis, characterization and applications in coordination and catalysis." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30274/document.

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Ce travail présente la synthèse de ligands mixtes germylène-sulfoxyde qui ont été utilisés en chimie de coordination avec plusieurs métaux de transitions et finalement appliqués en catalyse de transfert d'hydrogène. Une seconde partie de ce travail est axée sur la synthèse de nouveaux métallylènes stabilisés par un sulfonimidamide qui ont été appliqués en catalyse de polymérisation. Le premier chapitre présente l'état de l'art des germylènes avec leurs synthèses, modes de stabilisations et finalement leur chimie de coordination et leurs applications en catalyse. Les sulfoxydes seront aussi déc

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13

Brunel, Paul. "Complexes pince et cooperativité métal/ligand : application en catalyse." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30275/document.

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Ce travail de thèse porte sur la chimie organométallique des complexes pince indényle/indénediide de palladium et de platine et leurs applications en catalyse coopérative métal-ligand. Le premier chapitre de ce manuscrit fait un point bibliographique non-exhaustif du domaine de la coopérativité métal-ligand, des travaux de Noyori sur l'hydrogénation asymétrique, jusqu'aux récents travaux de Milstein avec les ligands désaromatisés. Les ligands pince sont également présentés. Du premier exemple PCP décrit par Shaw jusqu'au CNC développé par Bezuidenhout. La versatilité de ces ligands est illustr

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14

Bubrin, Martina [Verfasser], and Wolfgang [Akademischer Betreuer] Kaim. "Untersuchungen von Komplexen mit hemilabilen Liganden in unterschiedlichen Oxidationsstufen / Martina Bubrin. Betreuer: Wolfgang Kaim." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2014. http://d-nb.info/1052020984/34.

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15

Paretzki, Alexa [Verfasser], and Wolfgang [Akademischer Betreuer] Kaim. "Elektrochemische, spektroskopische und magnetische Eigenschaften von Komplexen eines neuen hemilabilen "nicht-unschuldigen" Liganden und verschiedener Azobispyridine / Alexa Paretzki. Betreuer: Wolfgang Kaim." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2015. http://d-nb.info/1074404920/34.

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16

Yaman, Gülşah. "Chemistry of a new trispyrazolylborate ligand with some group 1 group 2 ions." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1198505869.

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17

Thompson, Catharine. "A structural study of palladium complexes containing hemilabile ligands." Thesis, 2012. http://hdl.handle.net/10210/7092.

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D.Phil.<br>Palladium chemistry has advanced dramatically in the last few years, with a huge number of wide-ranging studies, particularly with respect to the application of palladium complexes as catalysts, having been performed. The discovery of the phenomenon of hemilability (the ability of a ligand to be bidentately coordinated but with one donor atom more weakly bound and thus able to decoordinate in the presence of a catalytic substrate) has further assisted the growth, since it has allowed a greater understanding of the mechanisms of catalytic-reactions. However, the focus of much of this

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18

Lin, Chien-Min, and 林千閔. "Study on the Self-Assembly of Transition Metal Complexes Using Hemilabile Diaminodiamide Ligands." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/65616035179653808425.

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碩士<br>國立勤益科技大學<br>化工與材料工程系<br>99<br>Recently, supramolecular design, synthesis, and applications have been extensively studied. Transition metal complexes bearing nitrogen-containing ligands have many applications in biotechnology or industrial catalysis. In this thesis, we use Michael addition reaction to design and synthesize two kind of diaminodiamide ligands that are 4,7-Diazadecanediamide (L-2,2,2)、and 4,7-Dimethyl-4,7-diazadecanediamide (4,7-Me2-L-2,2,2), respectively. We utilize these ligand with transition metal ions (Cu2+, Ni2+, Zn2+) to proceed self-assembly reaction, and through int

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19

Hounjet, Lindsay. "Reactivity and hemilability of ortho-phosphinoaniline complexes of rhodium and ruthenium." Phd thesis, 2011. http://hdl.handle.net/10048/1831.

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Molecular transition metal catalysts offer unique potential for the production of fine chemicals. Chemical processes carried out in the presence of well defined molecular catalysts often only require mild, easily accessible conditions, fewer sacrificial reagents, and can selectively produce a desired product with minimal waste. The active site of a transition metal catalyst can be varied by the use of a hybrid ligand, which employs a combination of groups with different binding affinities for the metal center. Hybrid ligands possessing both substitutionally inert and labile donors, called “hem

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20

Wu, Jing-Yun, and 吳景雲. "A Study on Chelation Modes of Hemilabile Ligands Containing Phosphorus, Nitrogen, and Sulfur Atoms toward Late Transition Metal Ions." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/61537677576524487901.

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博士<br>國立中山大學<br>化學系研究所<br>91<br>Hemilabile ligands attracted much attention in past thirty years because they were effectively utilized in the field of coordination chemistry and homogenous catalysis. We have synthesized four tridentate iminophosphine ligands (o-Ph2P(C6H4)-C(H)=N-(CH2)n-R, n = 2, R = SnBu, LPNS1; n = 3, R = SMe, LPNS2; n = 3, R = OMe, LPNO3; and n = 3, R = NMe2, LPNN4) and one tridentate aminophosphine ligand (o-Ph2P(C6H4)CH2N(H)(CH2)3NMe2, LPNHN5) in this work. The structures of the iminophosphine copper(I) complexes were determined by the carbon-chain length between imino-ni

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21

Bonnaventure, Isabelle. "Synthèse de nouveaux ligands hémilabiles chiraux : application à la synthèse énantiosélective." Thèse, 2008. http://hdl.handle.net/1866/6567.

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22

Rogers, Cerrie Wenlyn. "A hemilabile ligand approach to ruthenium-based luminescent molecular sensors." Thesis, 2002. http://hdl.handle.net/2429/12775.

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In this thesis, luminescent Ru(II) complexes that contain a metal-based receptor site for nucleophilic small molecules were studied, with emphasis on their potential utility as luminescent chemosensors. Two approaches to achieving small-molecule dependent luminescence were investigated: one exploited a metal-based lumophore (Part 1) and the other an organic-based lumophore (Part 2). In Part 1 of this thesis, molecular sensors based on the well-known [cis,-Ru(bpy)₂(LL')]²⁺ lumophore were investigated. Complexes in which L'-L' is a hemilabile phosphine-ether ligand (POR) were shown to bin

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23

Thorne, Lisa Margaret. "Sensing of carbon monoxide via luminescence of ruthenium complexes containing a hemilabile phosphine pyrenyl ether ligand." Thesis, 2004. http://hdl.handle.net/2429/15717.

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Our laboratory previously reported a Ru2 + complex with a hemilabile phosphine ether ligand tcc-RuCl2(POC4Pyr-P,O)2 (14) (POC4Pyr = 4-{2- (diphenylphosphino)phenoxy}butylpyrene). This complex reacts rapidly with carbon monoxide to produce a significant luminescence response in which the monomer: excimer emission ratio changes dramatically. The reaction with CO is accompanied by a geometric isomerization from the initial trans-dicarbonyl product, ttt- RuCl2(CO)2(POC4Pyr-P)2 , to the cis-dicarbonyl product, crt-RuCl2(CO)2(POC4Pyr-P)2. However, an OFF-ON response was not achieved. Two meth

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