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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Side-Chain Sequence Guides 2D Ordering of π-Conjugated Macrocycles on Surfaces

2020년 9월 9일 11시 27분 09초
ORGN.P-389 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 21일(수) 17:00~17:30
Organic Chemistry
저자 및
Soobin Kim, Henry D. Castillo1, Zachary G. Ciesielski1, Steven L. Tait1,*, Dongwhan Lee*
Division of Chemistry, Seoul National University, Korea
1Department of Chemistry, Indiana University, United States
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승인 3건
In the surface self-assembly of rigid polyaromatics, peripheral side chains assist structural ordering by modulating the solubility and polarity at the liquid-solid interface. We now show that the “positional isomerism” of side chains around a cyclic π-skeleton can profoundly impact the energy landscape and the resulting 2D pattern, a hitherto unknown phenomenon. Macrocycles have a circular sequence. To install specific side chains at the designated positions, we have devised a modular and stepwise synthetic protocol to construct linear precursors of pre-defined sequences. An efficient intramolecular cyclization reaction of each of these molecules afforded compositionally identical yet regiochemically distinctive macrocycle isomers. STM imaging studies revealed that the sequence of the side chains around the cyclic π-skeleton profoundly impacts lateral interactions of molecules on the surface, thereby producing strikingly different 2D assembly patterns as a function of solvent polarity and surface coverage.