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2022 Fiscal Year Final Research Report

Developments of functions in solid-state molecular rotors and extension of them to topological chemistry

Research Project

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Project/Area Number 20K05650
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 35030:Organic functional materials-related
Research InstitutionTokyo Metropolitan University

Principal Investigator

Setaka Wataru  東京都立大学, 都市環境科学研究科, 教授 (60321775)

Project Period (FY) 2020-04-01 – 2023-03-31
Keywords人工分子ローター / 分子ジャイロコマ / 分子機械 / 誘電緩和 / 固体蛍光 / ビシクロアルカン / トポロジー構造化学 / 分子構造同相変換
Outline of Final Research Achievements

Macrocage molecules with a bridged π-electron system were designed and synthesized as artificial crystalline molecular rotors. These compounds were engineered as molecular gyroscopes, enabling the free rotation of the π-electron system even in the solid state. The research aimed to elucidate the relationship between molecular motion and composite function. For instance, thieno-thiophene dioxide bridged derivatives showed both solid-state dielectric relaxation and fluorescence properties, and the relationship between molecular motion and them were analyzed. Difluorophenylene and fluorene bridged derivatives displayed solid-state dielectric relaxation and fluorescnence, respectively. Furthermore, a simultaneous synthesis method for in/out isomers of macrocyclic bicycloalkanes was established from a siloxane cage, that was obtained as by-product through the synthesis of molecular gyrotops. The result provided evidence of the topological structural transformation of bicycloalkanes.

Free Research Field

機能物質化学

Academic Significance and Societal Importance of the Research Achievements

高度に機能デザインされた分子の機能性は、現代日常生活を豊かにする材料として利用されている。特に、分子の一部がメカニカルな運動を示す分子機械研究分野では、分子運動に伴う蛍光特性変化など、機能応用が内外で期待されている。本研究では、機能の宝庫であるπ電子系が、固体内でも自由回転可能な分子ジャイロコマを設計・合成し、結晶内部におけるπ電子系回転子の運動観察法確立と基礎物性を明らかにしてきた。本研究ではこの系を機能物質化学へと発展させるため、固体誘電性と固体蛍光の複合特性を持つ系を合成し、それらの物性の分子運動との関係性を解明した。さらに分子構造トポロジー化学のような新しい化学へと展開させた。

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Published: 2024-01-30  

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