WorldCat Identities

Djukic, Jean-Pierre

Overview
Works: 13 works in 15 publications in 2 languages and 17 library holdings
Roles: Thesis advisor, Author, Opponent, Other
Publication Timeline
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Most widely held works by Jean-Pierre Djukic
LES COMPLEXES ARENETRICARBONYLCHROME : REACTIVITE VIS-A-VIS DES HYDRURES by Jean-Pierre Djukic( Book )

2 editions published in 1992 in French and held by 4 WorldCat member libraries worldwide

L'ACTION DES HYDRURES SUR DES COMPLEXES ARENETRICARBONYLCHROME PERMET D'EFFECTUER DE NOUVELLES REACTIONS D'HYDRODEALKOXYLATIONS, D'HYDRODEARYLOXYLATIONS, D'HYDRODEHALOGENATIONS ET D'HYDRODEAMINATIONS SUIVANT DES MECANISMES DE SUBSTITUTIONS NUCLEOPHILES AROMATIQUES IPSO, CINE ET TELE-META. LA FORMATION INTERMEDIAIRE D'ADDUITS H5-CYCLOHEXADIENYLE ANIONIQUES EST ETUDIEE
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 by Christophe Michon( Book )

2 editions published in 2003 in French and held by 2 WorldCat member libraries worldwide

This thesis deals with the study of the reactivity of cyclomanganated complexes versus various diazoalcanes under thermolytic conditions. The reaction of mononuclear cyclomanganated complexes versus diazoalcanes has been explored, paying first attention to the selectivity of this new reaction. This latter proceeds readily when the diazoalcane is added to a refluxed solution of a cyclomanganated complex under an argon atmosphere. It first induces the formation of transient manganese alkylidene in-situ. Then, the generation of helical complexes, named metallo-spiralenes, occurs in high yield upon insertion of the manganese alkylidene in the carbon-manganese bond and formation of a new carbon-carbon bond.It has been demonstrated that the steric hindrance at the alpha position to the diazo function plays a major role upon the selectivity of the carbene insertion step (cis-migration step).The synthesis of binuclear organometallic helices has been thoroughly investigated, as well as their electrochemical behavior. As shown by the cyclic-voltammetry measurements, the electroattractive effect of the tricarbonylmanganese fragments increases the reduction potentials of the encapsulated heterocyclic ligands. For each synthesised helical complex, the heterocycle is encapsulated between two phenyl rings, with an average interannular distance of 3.5 angstrom. Stabilizing pi intramolecular interactions between the aromatic rings are favored by the off-centre position of the two tricarbonylmanganese fragments.Finaly, the reactivity of cyclomanganated complexes towards 9-diazofluorene, diazoindene and 5-diazocyclopentadiene has been studied, leading to a large variety of (eta-5-cyclopentadienyl)tricarbonylmanganese complexes, generaly with good yields
Stereoselective Sulfinyl Aniline-Promoted Pd-Catalyzed C−H Arylation and Acetoxylation of Aliphatic Amides( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Abstract: Stereoselective functionalization of aliphatic C−H bonds presents a great challenge. Following this target, we disclose herein an original strategy towards direct arylation of aliphatic chains at ß-methylene position based on a use of amide-sulfoxide bicoordinating directing group. Although moderate to high chiral induction (up to 9:1 d.r.) is achieved, diastereomerically pure compounds may be afforded by simple separation of diastereomeric products by silica gel chromatography. Accordingly, this reaction allows preparation of a large scope of high-value scaffolds in synthetically useful yields while recyclable character of our chiral auxiliary brings an additional benefit. A potential of this methodology to build up original molecules by sequential diarylation and expedient (two step) synthesis of a biologically active compound are further disclosed. Finally a first example of stereoselective direct acetoxylation of aliphatic chains is reported. Abstract : Aliphatic stereogenic chains can now be obtained through C(sp3)−H activation using the recyclable chiral auxiliary p-tolylsulfinylaniline
Sulfoxydes : novel strategy for the asymmetric C(sp3)-H activation by Soufyan Jerhaoui( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Pendant de nombreuses années, les liaisons C-H aliphatiques ont été considérées comme dormantes, difficilement exploitables dans le contexte de la chimie organique. Le défi le plus important est de sélectionner une liaison C-H parmi toutes celles que contient une molécule. L'approche la plus utilisée à ce jour est l'utilisation d'un groupement directeur qui permet, en se liant à un métal, de diriger l'activation d'une liaison C-H en particulier. Suite au développement des groupements bicoordinants, nous avons développé notre propre groupement bicoordinant chiral. Cet auxiliaire nous a permis de réaliser de nombreuses transformations diastéréosélectives sur des carbones aliphatiques telles que l'arylation et l'oléfination. Nous l'avons également utilisé pour développer une méthodologie innovante pour la synthèse de produits naturels. Suite à ces travaux, nous avons développé un nouveau ligand chiral qui a été utilisé dans l'arylation et l'alkynylation énantiosélectives de cycloalcanes
Complexes phosphorescents chiraux de métaux nobles à ligands carbènes N-hétérocycliques-chromophores by Antoine Groué( )

1 edition published in 2020 in French and held by 1 WorldCat member library worldwide

The research work presented in this manuscript deals with the synthesis of novel class of racemic and enantiopure luminescent complexes. Owing to the expertise of the ARC team "ARChitectures Moléculaires: chiralité, coordination et luminescence " in the field of luminescent coordination complexes; Three series of new coordination complexes were synthesized: (i) Octahedral complexes displaying an organometallic ligand. The absorption and emission properties of these complexes have been studied. Moreover the solid state x-ray molecular structure of complex {[(F2ppy)2Ir][Cp*Ru(Cat)]} (Cat = Catecholate) showed the formation of a honey-comb assembly at the supramolecular level. Enantiopure complexes have been synthesized using optically active amino acids. The photophysical and chiroptic properties of the enantiopure complexes have been studied. (ii) In a second approach, the organometallic ligand was replaced by an N-heterocyclic-chromophore carbene ligand of the type "NHC-Naphthalimide". The complexes {[(X2ppy)2Ir][nBu-NHC-NI]} (X = H or F) were emissive and exhibited an increase in stability thanks to the carbene ligand when compared to the complexes of series (i). In addition the racemic complexes were separated via chiral column chromatography. Their photophysical and chiroptic properties have been studied. (iii) Finally a series of tetrahedral complexes [(Cp*MI)(Me-NHC-NI)] (M = Ir or Rh) with "piano stool" geometry were obtained displaying five and six membered metallacycles. These complexes have shown interesting photophysical properties, in particular the iridium complex [(Cp*IrI)(Me-NHC-NI)] exhibited a double emission at room temperature in solution (phosphorescence and fluorescence). In order to probe the photophysical properties of this type of complexes, two new series with acetylide ligand ([(Cp*Ir-C≡CPh)(Me-NHC-NI)]) as well as with NHC-Pyrene ligand ([(Cp*IrCl)(Me-NHC-Pyr)]) were synthesized and studied
Study and applications of the H-Si bond activation of silanes by iridacycles : a contribution to the design of multicompetent catalysts by Mustapha Hamdaoui( )

1 edition published in 2017 in English and held by 1 WorldCat member library worldwide

Une nouvelle famille de précatalyseurs à base d'lr(lll) a été découverte. La facilité de leur préparation, leur remarquable stabilité, et surtout leur excellente efficacité catalytique dans plusieurs réactions, c.-à-d. la 0-silylation d'alcools, l'hydrosilylation de fonctions CO et CN et l'activation de la liaison C-F, constituent un ensemble de propriétés que d'autres précatalyseurs organométalliques similaires connus à ce jour ne possèdent pas. Le fait le plus significatif est la mise en évidence expérimentale et théorique que les espèces catalytiques impliquées fonctionnement comme une paire de Lewis du type donneur-accepteur [lr(lll)H]-->[SiR3]. Dans ce cas le ligand silylium doit être considéré comme un ligand Z en appliquant le formalisme de Green, ce qui suggère un état d'oxidation formel de +Ill pour l'atome d'iridium. Cette thèse a contribué à une meilleure compréhension de la chimie du silylium appliquée à la chimie organométallique, et a abouti à l'émergence d'un nouveau champ de recherche qui pourra permettre l'élaboration de nouveaux précatalyseurs multicompétents
Iridium(III) silylene complexes : trapping, reactivity and applications by Binh Dang Ho( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

The scope of this thesis spans the most recent advances in the investigation of chemical bonds of iridium-silicon complexes, in which a metal-bound silyl group behaves as a Z ligand that maintains a dative bond with the metal centre. This contrasts greatly with the case where this group behaves like an X ligand, that is where this silyl group binds to Ir through a covalent bond. Finally, and most interestingly are silylene ligands that in principle should establish a double bond with the Ir centre. The idea of evaluating and tuning the electrophilic character of the silyl moiety and adjuncts its “silylicity” was probed by experimental and theoretical means. To conduct that scheme, a broad range of metal-silane adducts and other metal-silyl complexes were investigated by the computation of metal-silyl interaction energies to outline the established tools that rationalize the bonding relationship that exists between the metal center and a SiR3 moiety. Also, this research revealed a clear separation between cases in which the Z character of the silyl moiety is the best description, and cases that belong to “classical” situations in which the X character dominates. Moreover, we postulated that for metal-silane adducts that possess a low intrinsic silylicity, a high “silylicity” can be triggered by ligand replacement or by changing in the charge of the complex.While working on this topic, we discovered that in the presence of tetrahydrofuran (THF), [(Ir-H)→SiRH2]+ adducts readily convert by H2 gas elimination at sub-ambient temperature into new THF-stabilized metallacyclic Ir(III)-"silylene" complexes. The emergence of metal silylene complexes via sequential H-Si activations followed by the spontaneous release of H2 featured in this thesis is unique. The primary goal of this thesis finally was to fully characterize those elusive complexes by NMR spectroscopy analyses and X-ray diffraction analysis. Furthermore, theoretical investigations (static DFT-D reaction-energy profiling, ETS-NOCV) and NMR kinetic studies were utilized to demonstrate the role of THF which facilitated H2 elimination. Coupled with silylene metal complex chemistry mentioned above, cationic iridacycle 1b is of interesting catalytic reactivity toward nitro arenes, which can perform the nitro reduction in arenes to give aniline type products.In crafting a new development of this chemistry, it is safe to hypothesize that cationic hydrido-Ir(III)-silylium species, whose catalytic reactivity is of significant correlation with the extend of polarization of the molecule can enhance in the key intermediates the molecule polarization, and therefore increase its catalytic reactivity. Such polarization that occurs already in the Ir-silane adduct stems from the electropositivity of Si centre. Keeping the main ligand backbone constant, introduction of a fluoro substituent can improve the polarization of the same molecule and by way of consequence increase its catalytic reactivity.As expected, F-1a also displays remarkable catalytic reactivity toward a benchmark test reaction that can be followed by piezometry, i.e. the O-dehydrosilylation of alcohols at room temperature with Et3SiH. A hydrido-Ir(III)-silylium intermediate crystal was trapped as well following on a reaction with Et2SiH. In conclusion, based on the discovery of hydrido-Ir(III)-silylium intermediates associated with a comprehensive study of their reactivity and catalytic performance, this thesis has taken steps to advance knowledge of Ir-silicon complexes by synthesis and the full structural characterization of notoriously elusive metal silylene complexes. Also, sophisticated computational methods have been employed to shed light on the mechanism of conversion of Ir-silane adducts into silylenes of which a great number were trapped by reactive recrystallization and subsequently characterized by X-ray diffraction analysis
Experimental and theoretical charge density analysis of functionalized polyoxovanadates : toward a better understanding of chemical bonding and chemical reactivity by Xiao Xu( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

The functionalized polyoxovanadates (POVs) exhibit nanoscale superoctahedral cluster-core structures, fascinating electronic and magnetic properties, various thermodynamically stable redox isomers, and potential catalytic capabilities. Among of the various properties, we are interested in the charge transfer and fluorescent properties. However, understanding such a charge transfer behavior and fluorescence mechanism of these functionalized hexavanadates is still a formidable challenge.High resolution X-ray crystallography allows the analysis of the electronic and topological properties, and provides a method to study the chemical bonding and chemical reactivity based on charge density and the electrostatic properties determination. Experimental and theoretical charge density analysis of functionalized polyoxovanadates has been carried out and the related properties have been discussed at the atomic level.In this manuscript, we present the results of: i) experimental charge density and related electronic and topological properties of two functionalized hexavanadates (V6), [(C4H9)4N]2[V6O13{(OCH2)3CCH2OCCH2CH3}2] (V6-C3) and Na2[V6O13{(OCH2)3CCH2OH}2]·3.5H2O (V6OH); ii) theoretical calculations on a series of functionalized V6 compounds, and decavanadate (V10). The chemical information from charge density analysis is used for a better understanding of the charge density distribution, charge transfer, fluorescent properties, functionalization behavior, and biological activities
Experimental and theoretical investigations of intermetallic in transition metal coordination and organometallic complexes by Predrag Petrović( )

1 edition published in 2014 in English and held by 1 WorldCat member library worldwide

This thesis has shown the importance of integration of theoretical calculations and experimental investigations in studying the role of non-covalent interactions and particularly dispersion interactions in transition metal chemistry. Several subjects were addressed, such as stacking interactions of chelates in transition metal complexes in solid state, influence of chirality on the oligomerization of Rh(I) isonitrile complexes in solution and the stability of the cis-platin type complexes in concentrated solutions. Isothermal titration calorimetry proved to be very useful in the studies by providing accurate experimental data on the thermochemistry of addressed processes. This data was used to gauge the ability of the theoretical methods to accurately reproduce the experimental results. Calculations have shown that the proper treatment of dispersion effects and solvation by theoretical models gives values in relatively good agreement with experiments, but further improvements are needed
Syntheses of nonracemic ortho-mercurated and ortho-ruthenated complexes of 2-[tricarbonyl([êta]⁶-phenyl)chromium]pyridine( )

1 edition published in 2004 in English and held by 1 WorldCat member library worldwide

Experimental and theoretical approaches coupled with thermochemistry of reactions in solution and the role of non-covalent interactions by Milan Milovanovic( )

1 edition published in 2018 in English and held by 1 WorldCat member library worldwide

Ce manuscrit aborde plusieurs interactions / réactions chimiques importantes se produisant dans la soluton en utilisant la calorimétrie par titrage isothermique (ITC) et la théorie de la densité fonctionnelle statique (DFT). Cette thèse porte son attention notamment sur : l'association de paires de Lewis (frustrées) ((F)LPs), la migration cis du groupe méthyle au sein du pentaméthylmanganèse induit par les phosphines, l'aminolyse de carbènes de Fischer, l'insertion d'alcynes dans des palladacycles, l'affinité de divers donneurs de Lewis à l'hexafluoroisopropanol. L'ITC s'est révélé être une technique expérimentale puissante pour obtenir des données thermochimiques fiables sur les systèmes étudiés. Les calculs statiques DFT-D ont montré une capacité d'estimation correcte des paramètres de réaction thermodynamique lorsque l'influence de la solvatation n'est pas significative. Autrement, lorsque l'influence du solvant est apparente, les calculs ne permettent pas de reproduire les résultats expérimentaux. En plus, les résultats expérimentaux et théoriques révèlent l'existence d'ensembles moléculaires plus grandes dans la solution de FLP, soulignant le rôle des interactions non covalentes
 
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Audience level: 0.95 (from 0.88 for Stereosele ... to 1.00 for Complexes ...)

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