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dc.contributor.advisorCortés-Figueroa, José E.
dc.contributor.authorCapella-Capella, Cynthia
dc.date.accessioned2018-04-09T15:20:04Z
dc.date.available2018-04-09T15:20:04Z
dc.date.issued2008
dc.identifier.urihttps://hdl.handle.net/20.500.11801/398
dc.description.abstractThe organometallic functionalization of C60 can produce novel materials with potential applications in fields such as material science, electronics, and catalysis. Understanding the structure-dependent electronic and mechanical properties of C60 is critical for their chemical manipulations and technological applications. The reactions of C60 with primary and secondary amines[2-4] produce adducts that can be precursors of active catalysts. They react to form tetra(amino)-fullerene epoxide (amino = piperidine). The progress of adduct formation was followed by monitoring the increase of the absorbance values at 407 nm under flooding conditions where the piperidine concentration is greater than the concentration of C60 ([pip] >> [C60]). Plots of absorbance versus time were biexponential, indicative of consecutive first order reactions. The first segment of the biphasic plot was ascribed to two consecutive piperidine additions. The second segment of the biphasic plot was ascribed to another two consecutive piperidine additions. The reaction corresponding to the second segment was followed by a hydrogen peroxide epoxidation producing a tetra(amino)-fullerene epoxide. Also, we are reporting the mechanisms of C60 dissociation from (η2-C60)Ir(CO)(PPh3)2Cl. The dissociation was followed observing the decrease of the absorbance values at 550nm. Plots of absorbance versus time were exponential. Two mechanisms of reaction are being proposed. One of the proposed mechanisms may involve solvent-assisted C60 dissociation. The order with respect to non-coordinating solvents and to coordinating solvent is zero and first order, respectively. The rate constant values for the dissociation are independent of the C60 concentration.
dc.description.abstractLa funcionalización organometálica de C60 pueden producir materiales noveles con aplicaciones potenciales en los campos de ciencia de materiales, electrónica y catálisis. Es importante el entender la dependencia estructural en las propiedades electrónicas y mecánicas de C60 para manipulaciones químicas y aplicaciones tecnológicas. Las reacciones de C60 con aminas primarias y secundarias[2-4] producen aductos que pueden ser precursores de catalíticos. Reaccionan formando aductos de C60-(pip)4(O) (pip = piperidina). El progreso de la formación de los aductos es monitoreando siguiendo el aumento en absorbancia a 407 nm, bajo condiciones “flooding” donde la concentración de piperidina es mayor que la concentración de C60 ([pip] >> [C60]). Las graficas de absorbancia versus tiempo muestran un comportamiento biexponencial, indicativo de reacciones consecutivas. El primer segmento de la grafica bifásica se atribuye a la adición consecutiva de dos moléculas de piperidina mediante adiciones. El segundo segmento se atribuye a la adición consecutiva de otras dos moléculas de piperidina mediante adiciones, seguida de una reacción de epoxidación con peróxido de hidrogeno para dar el producto C60-(pip)4(O). Además, se reportan los mecanismos de la disociación de C60 del complejo (η2-C60)Ir(CO)(PPh3)2Cl. La disociación se monitoreo observando la disminución en absorbancia a 550 nm. Las graficas de absorbancia versus tiempo son decaimientos exponenciales. Se proponen dos mecanismos de reacción. Los mecanismos propuestos para dicha disociación podrían ser asistidos por el disolvente. El orden con respecto a disolventes no coordinados es de cero orden, mientras que para los disolventes coordinados es de primer orden. Los valores de la constante de rapidez para dicha disociación son independientes de la concentración de C60. Estos dos ejemplos para la funcionalización de C60 muestran como las propiedades de C60 participan en la modificación de catalíticos.
dc.description.sponsorshipGraduate and Undergraduate Students Enhancing Science and Technology in K-12 Schools (GUEST K-12) and the Chemistry Department of the University of Puerto Rico at Mayagüezen_US
dc.language.isoenen_US
dc.subjectKinetic studiesen_US
dc.subjectOrganometallic complexesen_US
dc.subjectAminesen_US
dc.subject.lcshFullerenes--Solubilityen_US
dc.subject.lcshAminesen_US
dc.subject.lcshOrganometallic compoundsen_US
dc.titleFunctionalization of [60]Fullerene using organometallic complexes and aminesen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2008 Cynthia Capella Capellaen_US
dc.contributor.committeeMeléndez, Enrique
dc.contributor.committeeRios-Steiner, Jorge L.
dc.contributor.representativeRamirez, Jaime
thesis.degree.levelM.S.en_US
thesis.degree.disciplineChemistryen_US
dc.contributor.collegeCollege of Arts and Sciences - Sciencesen_US
dc.contributor.departmentDepartment of Chemistryen_US
dc.description.graduationYear2008en_US


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