Development of Homogeneous Aqueous Transition Metal Catalysts for Sustainable Chemistry

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dc.contributor.advisorDo, Loi H.
dc.contributor.committeeMemberGilbertson, Scott R.
dc.contributor.committeeMemberColtart, Don M.
dc.contributor.committeeMemberXu, Shoujun
dc.contributor.committeeMemberWu, Tianfu
dc.creatorAdams, Michael J. 1987-
dc.creator.orcid0000-0002-6307-9356
dc.date.accessioned2018-11-30T17:04:29Z
dc.date.available2018-11-30T17:04:29Z
dc.date.createdMay 2018
dc.date.issued2018-05
dc.date.submittedMay 2018
dc.date.updated2018-11-30T17:04:30Z
dc.description.abstractOrganic solvents are often chosen in the development of homogeneous organometallic catalysts due to increased solubility, stability, and control. Various combinations of organic solvents are frequently tested for their solvent effects in order to improve catalytic efficiency or selectivity. Many organic solvents can also be dried or removed from the reaction with ease. On the other hand, homogeneous catalysis in water presents significant challenges. These problems include a narrow variety of co-solvents to chose from, low solubility of organic ligands, and relatively small temperature ranges (5-100 °C). Aqueous catalysts must also compete with protic solvents, counterions, and other catalytic species in the reaction mixture. Despite these obstacles, the use of water is environmentally and economically sustainable. The high specific heat capacity and heat of vaporization of water allows more energy to be transferred at a given temperature. The excellent hydrogen bonding ability of water, and equilibrium of hydronium and hydroxide, offer additional advantages. In this project, we studied an assortment of aqueous soluble catalysts to enhance their catalytic efficiencies. A Cp*Ir(dihydroxy-bipyridine) complex was found to be regioselective in transfer hydrogenations at room temperature. A new Cu(dihydroxy-bipyridine) catalyst was introduced for phosphate ester hydrolysis in water. Cobalt salophen catalytic systems were developed for chemoselective alkyne hydrations in methanol/water. Cobalt cyclen heterobimetallic catalytic systems showed potential for further use in nitrile hydration at low temperatures. This work has utilized principles of sustainable chemistry to develop and expand homogeneous aqueous transition metal catalysis.
dc.description.departmentChemistry, Department of
dc.format.digitalOriginborn digital
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/10657/3470
dc.language.isoeng
dc.rightsThe author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s).
dc.subjectAqueous
dc.subjectWater
dc.subjectHomogeneity
dc.subjectCatalysis
dc.subjectOrganometallic
dc.subjectTransition metals
dc.titleDevelopment of Homogeneous Aqueous Transition Metal Catalysts for Sustainable Chemistry
dc.type.dcmiText
dc.type.genreThesis
local.embargo.lift2020-05-01
local.embargo.terms2020-05-01
thesis.degree.collegeCollege of Natural Sciences and Mathematics
thesis.degree.departmentChemistry, Department of
thesis.degree.disciplineChemistry
thesis.degree.grantorUniversity of Houston
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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