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Applications of Synthesis in Copolymer Upcycling, Reduction of CO₂, Ligand Non-Innocence, and New Weakly-Coordinating Anions
Applications of Synthesis in Copolymer Upcycling, Reduction of CO₂, Ligand Non-Innocence, and New Weakly-Coordinating Anions
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103652
- ISBN
- 9798290629247
- DDC
- 547.14
- 서명/저자
- Applications of Synthesis in Copolymer Upcycling, Reduction of CO₂, Ligand Non-Innocence, and New Weakly-Coordinating Anions
- 발행사항
- [Sl] : California Institute of Technology, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 360 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Agapie, Theodor.
- 학위논문주기
- Thesis (Ph.D.)--California Institute of Technology, 2024.
- 초록/해제
- 요약This dissertation focuses on a very diverse series of studies with synthetic applications to organometallic systems supported by a redox non-innocent ligand architecture, α,ω diene generation, ionomers for tuning performance of electrochemical CO2reduction, and design of new weakly coordinating anions.Chapter 2 discusses the reactivity of a 9,10-anthracenediyl bis(phenoxide) titanium complex, where the polyaromatic anthracene motif functions as a non-innocent ligand. This enables access to a reduced Ti complex which is competent for oxidative coupling of alkyne and nitrile substrates, and pyrimidines and substituted benzenes can be accessed catalytically. Additional reactivity with oximes and oxidative coupling of alkynes and CO2is explored.Chapter 3 reports a two-step method for generation of a distribution of α,ω-dienes from ethylene and butadiene. Copolymers are prepared with variable butadiene content, where 1,4-butadiene incorporation ensures the double bonds are in the polymer backbone. Subsequent ethenolysis of the copolymers produces α,ω-dienes in the C10-C20range. The conditions can be modified to control product selectivity.Chapter 4 presents a series of polystyrene-based ionomers to probe the impact of local [K+] in the Cu electrode microenvironment on CO2R performance (Part A). Partial current density towards C2+products (|jC2+|) increases with [K+] in ionomer, up to 225 mA cm-2. When K+is replaced with [Me4N]+, performance lowers to the level of bare Cu, highlighting the crucial role of K+in improving C2+product selectivity. Molecular dynamics simulations and partial pressure CO2experiments support enhanced CO2mass transport with the ionomers. An expanded series of ionomers is presented (Part B), where the incorporation of different neutral comonomers (vinyl biphenyl) and cross-linking monomers (biphenyl and terphenyl) dramatically boosts performance.Direct tends between K+content and CO2R performance are not observed with the expanded series, highlighting the non-innocent role of the neutral monomer and polymer structure.Chapter 5 presents a new, Si-based weakly-coordinating anion. A library of anions bearing a variety of R groups is prepared, enabling facile tuning of sterics and solubility. A range of cations employed in chemical reactivity is supported by these anions, including ether-free alkali cations, Ph3C +, and an ethylene/CO copolymerization catalyst [Pd(dppe)(NCMe)Me]+(generated by salt metathesis or protonation of a metal-alkyl bond). Electrochemical studies on the [Bu4N]+variant show an exceptionally wide stability window for the [ MeSiF] - anion of 7.5 V in MeCN. The [ C6F5SiF]- variant can be readily modified to access additional diverse and/or dianionic variants.Chapter 6 discusses the electrochemical performance of a new class of magnesium electrolytes for next-generation batteries. [Mg(DME)3][ MeSiF]2demonstrates remarkable performance with good stability, moderate conditioning, high coulombic efficiency ( 96%), and high current density ( ~100 mA cm-2). However, the sensitivity of the experiments requires careful study of many parameters including impact of MgR2additives (identity and concentration), cycling protocol, synthetic route, and Pt working electrode to understand how the electrochemical performance is impacted. While addition of MgMe2improves electrochemical performance, it is not inherently required for reversible Mg deposition and stripping. Following an extensive investigation of the cyclic voltammetry (CV) performance of [Mg(DME)3][ MeSiF]2, preliminary screening of additional [Mg(DME)3][ RSiF]2variants is discussed.
- 일반주제명
- Polymer solubility
- 일반주제명
- Crystal structure
- 일반주제명
- Metals
- 일반주제명
- Electrolytes
- 일반주제명
- Hydrocarbons
- 일반주제명
- Electrodes
- 일반주제명
- Reagents
- 일반주제명
- Titanium
- 일반주제명
- Solvents
- 일반주제명
- Zirconium
- 일반주제명
- Polymerization
- 일반주제명
- Copolymers
- 일반주제명
- Dehydration
- 일반주제명
- Chemistry
- 일반주제명
- Voltammetry
- 일반주제명
- Magnesium
- 일반주제명
- Potassium
- 기타저자
- California Institute of Technology Chemistry and Chemical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202103652
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■007cr#unu||||||||
■020 ▼a9798290629247
■035 ▼a(MiAaPQ)AAI32098753
■035 ▼a(MiAaPQ)Caltech16489
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a547.14
■1001 ▼aBruening, Meaghan Ann.
■24510▼aApplications of Synthesis in Copolymer Upcycling, Reduction of CO₂, Ligand Non-Innocence, and New Weakly-Coordinating Anions
■260 ▼a[Sl]▼bCalifornia Institute of Technology▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a360 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Agapie, Theodor.
■5021 ▼aThesis (Ph.D.)--California Institute of Technology, 2024.
■520 ▼aThis dissertation focuses on a very diverse series of studies with synthetic applications to organometallic systems supported by a redox non-innocent ligand architecture, α,ω diene generation, ionomers for tuning performance of electrochemical CO2reduction, and design of new weakly coordinating anions.Chapter 2 discusses the reactivity of a 9,10-anthracenediyl bis(phenoxide) titanium complex, where the polyaromatic anthracene motif functions as a non-innocent ligand. This enables access to a reduced Ti complex which is competent for oxidative coupling of alkyne and nitrile substrates, and pyrimidines and substituted benzenes can be accessed catalytically. Additional reactivity with oximes and oxidative coupling of alkynes and CO2is explored.Chapter 3 reports a two-step method for generation of a distribution of α,ω-dienes from ethylene and butadiene. Copolymers are prepared with variable butadiene content, where 1,4-butadiene incorporation ensures the double bonds are in the polymer backbone. Subsequent ethenolysis of the copolymers produces α,ω-dienes in the C10-C20range. The conditions can be modified to control product selectivity.Chapter 4 presents a series of polystyrene-based ionomers to probe the impact of local [K+] in the Cu electrode microenvironment on CO2R performance (Part A). Partial current density towards C2+products (|jC2+|) increases with [K+] in ionomer, up to 225 mA cm-2. When K+is replaced with [Me4N]+, performance lowers to the level of bare Cu, highlighting the crucial role of K+in improving C2+product selectivity. Molecular dynamics simulations and partial pressure CO2experiments support enhanced CO2mass transport with the ionomers. An expanded series of ionomers is presented (Part B), where the incorporation of different neutral comonomers (vinyl biphenyl) and cross-linking monomers (biphenyl and terphenyl) dramatically boosts performance.Direct tends between K+content and CO2R performance are not observed with the expanded series, highlighting the non-innocent role of the neutral monomer and polymer structure.Chapter 5 presents a new, Si-based weakly-coordinating anion. A library of anions bearing a variety of R groups is prepared, enabling facile tuning of sterics and solubility. A range of cations employed in chemical reactivity is supported by these anions, including ether-free alkali cations, Ph3C +, and an ethylene/CO copolymerization catalyst [Pd(dppe)(NCMe)Me]+(generated by salt metathesis or protonation of a metal-alkyl bond). Electrochemical studies on the [Bu4N]+variant show an exceptionally wide stability window for the [ MeSiF] - anion of 7.5 V in MeCN. The [ C6F5SiF]- variant can be readily modified to access additional diverse and/or dianionic variants.Chapter 6 discusses the electrochemical performance of a new class of magnesium electrolytes for next-generation batteries. [Mg(DME)3][ MeSiF]2demonstrates remarkable performance with good stability, moderate conditioning, high coulombic efficiency ( 96%), and high current density ( ~100 mA cm-2). However, the sensitivity of the experiments requires careful study of many parameters including impact of MgR2additives (identity and concentration), cycling protocol, synthetic route, and Pt working electrode to understand how the electrochemical performance is impacted. While addition of MgMe2improves electrochemical performance, it is not inherently required for reversible Mg deposition and stripping. Following an extensive investigation of the cyclic voltammetry (CV) performance of [Mg(DME)3][ MeSiF]2, preliminary screening of additional [Mg(DME)3][ RSiF]2variants is discussed.
■590 ▼aSchool code: 0037.
■650 4▼aPolymer solubility
■650 4▼aCrystal structure
■650 4▼aMetals
■650 4▼aElectrolytes
■650 4▼aHydrocarbons
■650 4▼aElectrodes
■650 4▼aReagents
■650 4▼aTitanium
■650 4▼aSolvents
■650 4▼aZirconium
■650 4▼aPolymerization
■650 4▼aCopolymers
■650 4▼aDehydration
■650 4▼aChemistry
■650 4▼aVoltammetry
■650 4▼aMagnesium
■650 4▼aPotassium
■690 ▼a0485
■71020▼aCalifornia Institute of Technology▼bChemistry and Chemical Engineering.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0037
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358157▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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