Phosphorescence manipulation by boronic acid-based supramolecules

2022 Fiscal Year Final Research Report

• Project/Area Number: 19H02704
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 33010:Structural organic chemistry and physical organic chemistry-related
• Research Institution: Tokyo Metropolitan University
• Principal Investigator: Kubo Yuji 東京都立大学, 都市環境科学研究科, 教授 (80186444)
• Co-Investigator(Kenkyū-buntansha): 西藪 隆平 東京都立大学, 都市環境科学研究科, 助教 (00432865)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 燐光 / ホウ素 / ボロン酸 / 超分子 / 自己組織 / 残光センシング

Outline of Final Research Achievements

Boronic acids can participate in dynamic covalent bonds with diols to produce thermodynamically stable boronate ester supramolecules. The Lewis acidity of the boron allowed for not only pH-dependent binding capability but also significant interactions with Lewis bases such as anion species, which endows boronate systems with chemical stimulus-responsiveness to develop chemosensors, drug delivery, and so on. Recently, given that arylboronic acids show room-temperature phosphorescence (RTP) in the solid state, we investigated RTP characters of boronate particles obtained by sequential boronate esterification of 1,4-benzene diboronic acid with pentaerythritol. The related RTP films were also prepared. Combined with rhodamine derivatives, we successfully proposed afterglow-based functional supramolecules using triplet-to-singlet FRET process.

Free Research Field

有機化学、機能物性化学

Academic Significance and Societal Importance of the Research Achievements

三重項励起子は分子振動や酸素の影響を受けやすく、貴金属フリーな有機物を用いて室温燐光を得ることは容易ではない。しかしながら、残光現象は蛍光物質にない特徴であることから、高効率かつ長寿命燐光を発現する設計指針の確立は関連分野の発展に資する学術的意義がある。室温燐光は遅延発光として観察されるので、自家蛍光の影響を回避できるバイオイメージング法やセキュリティフィルムへの利用があげられ、安心・安全の社会に貢献できる。