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Multireference Studies of Transition Metal and Actinide Containing Molecular Systems
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
저자명  
Sauza de la Vega, Arturo.
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 magnetism
키워드  
Molecular qubits
키워드  
Multireference methods
키워드  
Zero-field splitting
기타저자  
The University of Chicago.
기본자료저록  
Dissertations Abstracts International. 87-03B.
전자적 위치 및 접속  
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MARC

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■00520260202104723
■006m          o    d                
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■020    ▼a9798293819768
■035    ▼a(MiAaPQ)AAI32121600
■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.

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