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Direct Detection of Chirality Induced Spin Selectivity in Organic Donor Acceptor Systems
Direct Detection of Chirality Induced Spin Selectivity in Organic Donor Acceptor Systems
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105158
- ISBN
- 9798265485274
- DDC
- 540
- 저자명
- Eckvahl, Hannah.
- 서명/저자
- Direct Detection of Chirality Induced Spin Selectivity in Organic Donor Acceptor Systems
- 발행사항
- [Sl] : Northwestern University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 173 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Wasielewski, Michael R.
- 학위논문주기
- Thesis (Ph.D.)--Northwestern University, 2025.
- 초록/해제
- 요약Quantum information science (QIS) has the potential to revolutionize computing by replacing classical bits with quantum bits (qubit). Two decades ago, discovery of the chirality induced spin selectivity (CISS) effect revealed the link between chirality and the electron spin. This work explores measuring the CISS effect in radical pairs of donor acceptor (D-B-A) molecules both for QIS applications and to clarify the CISS mechanism. Time resolved electron paramagnetic resonance (TREPR) spectroscopy was used to detect spin polarization from CISS in radical pairs in donor acceptor molecules. Chapter 1 provides a brief overview of QIS, the CISS effect and (D-B-A) molecules.In Chapter 2, four chiral (D-Bχ-A) molecules where is D either nondeuterated (-h9) or fully deuterated (-d9) peri-xanthenoxanthene (PXX), Bχ is a pair of naphthalene-1,8-dicarboximides that are linked together at the 4-position to form an enantiomeric pair of axially chiral dimers (R)-NMI2 and (S)-NMI2, and A = naphthalene-1,8:4,5-bis(dicarboximide) (NDI) were studied at 85K. A corresponding pair of achiral reference (D-B-A) molecules were also studied where B = naphthalene-1,8-dicarboximide. Transient Absorption confirmed formation of the radical pair via ultrafast two-step electron transfer upon photo excitation. Unambiguous signatures of CISS were observed in the TREPR of the radical pair when the molecules were aligned perpendicular to the external magnetic field.In Chapter 3 two chiral (D-Bχ-A) molecules where D = 2,2,6,6-tetramethyl[1,3]-dioxolo[4,5-f][1,3]benzodioxole (BDX) B = (R)- or (S)-2,2'-dimethoxy-4,4'-diphenyl-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthalene and A = NDI were studied at 85K. A corresponding achiral reference where B = 2",3',5',6"-tetramethyl-1,1':4',1":4",1‴-quaterphenyl was also studied. Transient Absorption confirmed formation of the radical pair via ultrafast two-step hole transfer upon photoexcitation. Clear signatures of CISS were observed in the TREPR on the radical pairs when molecules were in an unoriented glass.In Chapter 4 an achiral (D-B-A) molecule where D = p-methoxyaniline (MeOAn), B = 4-(N-piperidinyl)naphthalene-1,8-dicarboximide (ANI) and A = NDI was embedded into a cholesteric liquid crystal, formed by adding chiral dopant, Benzoic acid, 4-(hexyloxy)-,4-[[[(1R/)-1-methylheptyl]oxy]carbonyl]phenyl ester (R811) and its enantiomer S811 into nematic liquid crystal 4-cyano-4'-pentylbiphenyl (5CB). Circular dichroism confirmed that chirality transferred to the doped D-B-A molecule. Spectral signatures consistent with a high CISS contribution were observed in the TREPR at 85K when the samples were aligned perpendicular to the magnetic field.
- 일반주제명
- Chemistry
- 일반주제명
- Physical chemistry
- 일반주제명
- Quantum physics
- 키워드
- Radical pairs
- 기타저자
- Northwestern University Chemistry
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105158
■006m o d
■007cr#unu||||||||
■020 ▼a9798265485274
■035 ▼a(MiAaPQ)AAI32243718
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a540
■1001 ▼aEckvahl, Hannah.
■24510▼aDirect Detection of Chirality Induced Spin Selectivity in Organic Donor Acceptor Systems
■260 ▼a[Sl]▼bNorthwestern University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a173 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Wasielewski, Michael R.
■5021 ▼aThesis (Ph.D.)--Northwestern University, 2025.
■520 ▼aQuantum information science (QIS) has the potential to revolutionize computing by replacing classical bits with quantum bits (qubit). Two decades ago, discovery of the chirality induced spin selectivity (CISS) effect revealed the link between chirality and the electron spin. This work explores measuring the CISS effect in radical pairs of donor acceptor (D-B-A) molecules both for QIS applications and to clarify the CISS mechanism. Time resolved electron paramagnetic resonance (TREPR) spectroscopy was used to detect spin polarization from CISS in radical pairs in donor acceptor molecules. Chapter 1 provides a brief overview of QIS, the CISS effect and (D-B-A) molecules.In Chapter 2, four chiral (D-Bχ-A) molecules where is D either nondeuterated (-h9) or fully deuterated (-d9) peri-xanthenoxanthene (PXX), Bχ is a pair of naphthalene-1,8-dicarboximides that are linked together at the 4-position to form an enantiomeric pair of axially chiral dimers (R)-NMI2 and (S)-NMI2, and A = naphthalene-1,8:4,5-bis(dicarboximide) (NDI) were studied at 85K. A corresponding pair of achiral reference (D-B-A) molecules were also studied where B = naphthalene-1,8-dicarboximide. Transient Absorption confirmed formation of the radical pair via ultrafast two-step electron transfer upon photo excitation. Unambiguous signatures of CISS were observed in the TREPR of the radical pair when the molecules were aligned perpendicular to the external magnetic field.In Chapter 3 two chiral (D-Bχ-A) molecules where D = 2,2,6,6-tetramethyl[1,3]-dioxolo[4,5-f][1,3]benzodioxole (BDX) B = (R)- or (S)-2,2'-dimethoxy-4,4'-diphenyl-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthalene and A = NDI were studied at 85K. A corresponding achiral reference where B = 2",3',5',6"-tetramethyl-1,1':4',1":4",1‴-quaterphenyl was also studied. Transient Absorption confirmed formation of the radical pair via ultrafast two-step hole transfer upon photoexcitation. Clear signatures of CISS were observed in the TREPR on the radical pairs when molecules were in an unoriented glass.In Chapter 4 an achiral (D-B-A) molecule where D = p-methoxyaniline (MeOAn), B = 4-(N-piperidinyl)naphthalene-1,8-dicarboximide (ANI) and A = NDI was embedded into a cholesteric liquid crystal, formed by adding chiral dopant, Benzoic acid, 4-(hexyloxy)-,4-[[[(1R/)-1-methylheptyl]oxy]carbonyl]phenyl ester (R811) and its enantiomer S811 into nematic liquid crystal 4-cyano-4'-pentylbiphenyl (5CB). Circular dichroism confirmed that chirality transferred to the doped D-B-A molecule. Spectral signatures consistent with a high CISS contribution were observed in the TREPR at 85K when the samples were aligned perpendicular to the magnetic field.
■590 ▼aSchool code: 0163.
■650 4▼aChemistry
■650 4▼aPhysical chemistry
■650 4▼aQuantum physics
■653 ▼aMagnetic resonance
■653 ▼aQuantum information science
■653 ▼aRadical pairs
■690 ▼a0485
■690 ▼a0599
■690 ▼a0494
■71020▼aNorthwestern University▼bChemistry.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0163
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359684▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
