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Multireference Studies of Transition Metal and Actinide Containing Molecular Systems
Multireference Studies of Transition Metal and Actinide Containing Molecular Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104723
- ISBN
- 9798293819768
- DDC
- 540
- 서명/저자
- Multireference Studies of Transition Metal and Actinide Containing Molecular Systems
- 발행사항
- [Sl] : The University of Chicago, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 216 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Gagliardi, Laura.
- 학위논문주기
- Thesis (Ph.D.)--The University of Chicago, 2025.
- 초록/해제
- 요약Density functional theory (DFT) has long been the most widely used method in quantum chemistry for studying kinetics, reaction mechanisms, molecular interactions, and more. However, it faces significant challenges in accurately predicting and describing systems with unpaired electrons, such as radicals and transition metal complexes, i.e., strongly correlated systems. Understanding the properties of such systems often requires quantum chemistry methods beyond DFT, notably multireference wave function approaches.Multireference methods such as complete active space self-consistent field (CASSCF) and second-order perturbation theory (CASPT2) are commonly employed. However, their high computational cost and complexity often limit their applicability to small systems. To address this, new methods have been developed that aim to retain high accuracy while reducing computational demands. One such method, multiconfiguration pair-density functional theory (MC-PDFT), has demonstrated accuracy comparable to the gold-standard CASPT2, but with significantly lower computational expense.This thesis focuses on applying multireference wave function methods, particularly MC-PDFT, to study the magnetic properties of transition metal complexes, including (i) molecular qubits and (ii) newly synthesized molecules.Chapter 1 provides an overview of the theoretical foundations of the quantum chemistry methods used in this work. In Chapter 2, we present a computational protocol developed to predict energy gaps and zero-field splitting (ZFS) parameters of molecular spin qubits. We compare different multireference methods and highlight the importance of molecular geometry in obtaining semiquantitative predictions of the axial ZFS parameter |D|. Chapter 3 applies this protocol to investigate first-row and group 6 transition metal complexes as potential spin qubit candidates.Chapters 4 and 5 involve collaborative work with experimental groups, using quantum chemical methods to interpret and support experimental findings. Chapter 4 details the theoretical study of a newly synthesized Fe(IV) complex, which features a low-lying excited state and exhibits temperature-independent paramagnetism. Finally, Chapter 5 explores uranium complexes with tunable redox properties through ligand substitution, aiming to understand their electronic structure and bonding interactions.
- 일반주제명
- Chemistry
- 일반주제명
- Computational chemistry
- 일반주제명
- Physical chemistry
- 키워드
- Actinides
- 키워드
- Ligand design
- 키워드
- Molecular qubits
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■020 ▼a9798293819768
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■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aSauza de la Vega, Arturo.▼0(orcid)0000-0001-7957-3351
■24510▼aMultireference Studies of Transition Metal and Actinide Containing Molecular Systems
■260 ▼a[Sl]▼bThe University of Chicago▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a216 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Gagliardi, Laura.
■5021 ▼aThesis (Ph.D.)--The University of Chicago, 2025.
■520 ▼aDensity functional theory (DFT) has long been the most widely used method in quantum chemistry for studying kinetics, reaction mechanisms, molecular interactions, and more. However, it faces significant challenges in accurately predicting and describing systems with unpaired electrons, such as radicals and transition metal complexes, i.e., strongly correlated systems. Understanding the properties of such systems often requires quantum chemistry methods beyond DFT, notably multireference wave function approaches.Multireference methods such as complete active space self-consistent field (CASSCF) and second-order perturbation theory (CASPT2) are commonly employed. However, their high computational cost and complexity often limit their applicability to small systems. To address this, new methods have been developed that aim to retain high accuracy while reducing computational demands. One such method, multiconfiguration pair-density functional theory (MC-PDFT), has demonstrated accuracy comparable to the gold-standard CASPT2, but with significantly lower computational expense.This thesis focuses on applying multireference wave function methods, particularly MC-PDFT, to study the magnetic properties of transition metal complexes, including (i) molecular qubits and (ii) newly synthesized molecules.Chapter 1 provides an overview of the theoretical foundations of the quantum chemistry methods used in this work. In Chapter 2, we present a computational protocol developed to predict energy gaps and zero-field splitting (ZFS) parameters of molecular spin qubits. We compare different multireference methods and highlight the importance of molecular geometry in obtaining semiquantitative predictions of the axial ZFS parameter |D|. Chapter 3 applies this protocol to investigate first-row and group 6 transition metal complexes as potential spin qubit candidates.Chapters 4 and 5 involve collaborative work with experimental groups, using quantum chemical methods to interpret and support experimental findings. Chapter 4 details the theoretical study of a newly synthesized Fe(IV) complex, which features a low-lying excited state and exhibits temperature-independent paramagnetism. Finally, Chapter 5 explores uranium complexes with tunable redox properties through ligand substitution, aiming to understand their electronic structure and bonding interactions.
■590 ▼aSchool code: 0330.
■650 4▼aChemistry
■650 4▼aComputational chemistry
■650 4▼aPhysical chemistry
■653 ▼aActinides
■653 ▼aLigand design
■653 ▼aMolecular magnetism
■653 ▼aMolecular qubits
■653 ▼aMultireference methods
■653 ▼aZero-field splitting
■690 ▼a0485
■690 ▼a0219
■690 ▼a0494
■71020▼aThe University of Chicago.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0330
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17358584▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


