Now showing items 74-93 of 141

    Macrocicles nitrogenats contenint unitats de ferrocè i llurs complexos de Pal·ladi(0). Estudi estructural i aplicacions en catàlisi 

    Pla i Quintana, Anna (Date of defense: 2004-11-23)

    La present tesi doctoral s'ha basat en la caracterització estructural i en l'estudi de les propietats catalítiques de nous complexos de pal·ladi(0) amb lligands olefínics contenint unitats de ferrocè. En una primera fase ...

    Macrocyclic chemistry. From anion recognition to the reactivity of their copper complexes 

    Arbusé Font, Arnau (Date of defense: 2020-11-12)

    Macrocyclic ligands and its complexes have been studied in a wide variety of fields, among them bioinorganic chemistry. In this work it is reported three studies of macrocyclic species under three points of view. Firstly, ...

    Managanese and dicopper complexes for bioinspired oxidation reactions: catalytic and mechanistic studies on C-H and C=C oxidations 

    Garcia Bosch, Isaac (Date of defense: 2011-12-20)

    Enzymes are high-weight molecules which catalyze most of the metabolic processes in living organisms. Very often, these proteins contain one or more 1st row transition metal ions in their active center (Fe, Cu, Co, Mn, Zn, ...

    Metalls de transició en la formació d'enllaços carboni-carboni: cicloaddicions [2+2+2] catalitzades per Rh(I) i acoblaments creuats catalitzats per Pd(0) i Ni(0) 

    Brun Massó, Sandra (Date of defense: 2012-04-27)

    Carbon-carbon bond formation reactions catalyzed by transition metals represent one of the most versatile and efficient strategies in organic synthesis. The catalytic transformations contribute to the development of ...

    Model aryl halide macrocyclic substrates for the elucidation of coinage metal catalysed cross-coupling reaction mechanism 

    Font Molins, Marc (Date of defense: 2015-02-13)

    Aryl-Cu(III) species have been often implicated as the intermediate species that operate Ullmann-type couplings. However, such species have long remained elusive and the fundamental pathways that govern Ullmann-type ...

    Modelling of potential energy surfaces for photochemistry: conical intersections and application to optical control 

    Ruiz-Barragán, Sergi (Date of defense: 2014-09-19)

    Conical Intersections (CI) are points in Potential Energy Surfaces (PES) of two or more states that have the same energy. They are fundamental to understand photo-chemical processes. These points are not isolated points, ...

    Multiscalar strategies for the characterization of engineered P450 enzymes 

    Soler i Parpal, Jordi (Date of defense: 2023-09-19)

    Enzymes are a type of proteins that help chemical reactions happen faster in living organisms. Scientists have been able to modify these enzymes using a technique called protein engineering, which allowed to increase the ...

    New carbocyclisations of polyunsaturated hydrazones catalysed by rhodium(I) 

    Torres Antón, Òscar (Date of defense: 2017-02-24)

    Some of the most powerful methods for synthesizing complex organic molecules with high levels of chemo-, diastereo- and enantioselectivity rely on metal carbene chemistry. These compounds are versatile reaction intermediates ...

    New manganese complexes with nitrogen donor ligands. Catalysts for oxidation reactions 

    Rich Masallera, Jordi (Date of defense: 2012-06-08)

    The catalytic asymmetric oxidation of alkenes has special interest from both industrial and academic points of view. For this reason, catalysts able to perform these reactions in a faster and more effective manner have ...

    New mono- and dinuclear ruthenium complexes containing the 3,5-bis(2-pyridyl)pyrazole ligand. Synthesis, characterization and applications 

    Sens Llorca, Cristina (Date of defense: 2005-03-17)

    Se han sintetizado dos nuevos complejos mononucleares de Ru, con formula [RuCl2(Hbpp)(dmso)2], a partir de la reacción entre [RuCl2(dmso)4] y Hbpp (3,5-bis(2-piridil)pirazola). El hecho que sólo tres de los seis posibles ...

    New Ruthenium complexes containing N, P and S-donor type of ligands: coordination chemistry, characterization and application to asymetric and non-asymetric catalysis 

    Sala Román, Xavier (Date of defense: 2007-03-16)

    Síntesi de nous complexos de Ruteni amb lligands no quirals que tenen per fórmula [Ru(phen)([9]aneS3)X] (on X = H2O, py i MeCN). Caracterització espectroscòpica electroquímica i estructural d'aquesta família de complexos. ...

    Nous complexos de pal·ladi amb lligands macrocíclics triolefínics. Estructura i aplicacions 

    Masllorens i Llinàs, Judit (Date of defense: 2006-02-10)

    Aquesta Tesi Doctoral està dividida en diferents capítols tots ells basats en aplicacions de macrocicles nitrogenats triolefínics de 15 membres i dels seus complexos amb metalls de transició. En primer lloc es descriu ...

    Nous complexos mono- i dinuclears de ruteni amb lligands polipiridílics i de tipus fosfina. Síntesi, caracterització i aplicacions catalítiques 

    Mola i Marín, Joaquim (Date of defense: 2008-06-27)

    La Tesi descriu de manera completa una sèrie de complexos de ruteni amb lligands polipiridílics i lligands auxiliars de tipus fosfina, dmso, nitril o aquo. Es descriuen estudis d'isomerització (cis/trans o coordinació ...

    Nous formats en la comunicació de la química. Explorant el seu paper en el foment de la cultura i les vocacions científiques 

    Vieta i Corcoy, Pep Anton (Date of defense: 2017-02-07)

    Throughout this thesis I was involved in different science communication projects where research and innovation have been applied to improve existing proposals and exploring new formats without forget the evaluation of the ...

    Novel developments in the Diffusive Gradient in Thin films (DGT) technique for the determination of bioavailable mercury and other trace metals in aquatic and terrestrial environments 

    Turull López, Marta (Date of defense: 2019-07-19)

    This thesis is focused on the use of the Diffusive Gradient in thin film (DGT) technique for the analysis of bioavailable mercury and other trace metals in water and soil. Homemade DGT devices using a selective ion-exchange ...

    Noves aproximacions a la síntesi i caracterització de poliglicols al·lílics, polihidrosiloxans i surfactants copolimèrics. Avaluació d'aquests surfactants en formulacions de poliuretà 

    Nadal i Soy, Josep (Date of defense: 2002-12-10)

    Els polímers són una sèrie de compostos que troben un ampli ventall d'aplicacions en la indústria actual. Un exemple són les espumes de poliuretà, estructures de tipus cel·lular obtingudes mitjançant la reacció química ...

    O2 activation at bioinspired complexes: dinuclear copper systems and mononuclear non-heme iron compounds. Mechanisms and catalytic applications in oxidative transformations 

    Company Casadevall, Anna (Date of defense: 2008-12-16)

    L'activació d'oxigen que té lloc en els éssers vius constitueix una font d'inspiració pel desenvolupament d'alternatives als oxidants tradicionals, considerats altament tòxics i nocius. En aquesta treball s'utilitzen ...

    Occurrence and behaviour of silver nanoparticles in the environment: analytical methodologies and laboratory studies 

    Torrent Fàbrega, Laura (Date of defense: 2019-10-09)

    The production of engineered nanomaterials (ENMs) has grown in last years due to their special physicochemical properties in respect to their bulk counterparts, derived from their small size (1-100 nm). Among the existing ...

    On the use of energy decomposition analyses to unravel the origin of the relative stabilities of isomers 

    El Hamdi Lahfid, Majid (Date of defense: 2013-10-15)

    Structural isomers are molecules that have the same number and type of atoms but arranged in different manner. The isomerization energy is the energy difference between two isomers, i.e. the energy cost corresponding to ...

    Oxidation of unactivated C-H bonds catalyzed by manganese complexes: control over site-selectivity and enantioselectivity 

    Milan, Michela (Date of defense: 2018-10-30)

    The oxidation of aliphatic C-H bonds is a very powerful reaction because it allows the functionalization of inert C-H bonds, converting them into a suitable sites for further chemical elaboration. It also represents one ...