2021 Fiscal Year Final Research Report

Fabrication of nano scaled chemical devices based on rotaxane structure

Research Project

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Project/Area Number	19H02696
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	The University of Tokyo
Principal Investigator	Terao Jun 東京大学, 大学院総合文化研究科, 教授 (00322173)
Project Period (FY)	2019-04-01 – 2022-03-31
Keywords	分子配線 / 分子回路 / ロタキサン / 分子ワイヤ / 分子エレクトロニクス
Outline of Final Research Achievements	We synthesized a bimetallo-type molecular wire having a ruthenium and a platinum complex, and succeeded in synthesizing a coated molecular sensor material having two thresholds and showing sigmoid-type bioresponsiveness. We also succeeded in measuring the monomolecular conductivity of coated conjugated molecules using the STM-BJ method. For precise single-molecule conduction measurement, we succeeded in switching the electrical conductivity by moving the electrodes by the break junction method and by structural isomerization of the spiropyran molecule by mechanics. Furthermore, for a single-molecule sensor, we created a single-molecule sensor having cyclodextrin as a molecular recognition site, and succeeded in distinguishing four amino acids and their enantiomers within a few μs by real-time conductivity measurement.
Free Research Field	分子エレクトロニクス
Academic Significance and Societal Importance of the Research Achievements	本研究ではビルドアップ型の分子配線法を新たに考案することで，同一骨格からなる分子の長距離配線のみならず様々な機能分子が導入された分子回路の作製が可能となるのが特徴である．また，本手法は従来の架橋法と異なり，被覆効果により複数の共役分子による高密度・並列配線が可能となり，高い信号強度の伝導特性と高い分子配線の再現性が期待される．さらに，被覆効果により，共役鎖内での電荷移動のみが起こり，高い伝導特性が得られるとともに，共役分子の並列配線において問題となるπ-π相互作用による凝集や共役鎖の熱ゆらぎが抑制され，nmスケールの分子架橋でも高いS/N比を実現可能となる．