光を使って単一分子デバイスを正確に制御する(Using Light to Precisely Control Single-Molecule Devices)

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2024-03-01 コロンビア大学

新しい研究では、有機分子を使った単一分子デバイスが開発され、光を使って外部から制御できる可能性が示された。フェロセン分子を利用し、光によって金電極との直接結合を形成する手法が提案された。これにより、分子レベルでの電子デバイスの挙動を制御できる可能性が開かれる。今後の研究では、この光制御可能なデバイスの実用的な応用が探究される。

<関連情報>

フェロセンをベースにしたFe-Au結合単一分子接合の光酸化駆動形成 Photooxidation driven formation of Fe-Au linked ferrocene-based single-molecule junctions

Woojung Lee,Liang Li,María Camarasa-Gómez,Daniel Hernangómez-Pérez,Xavier Roy,Ferdinand Evers,Michael S. Inkpen & Latha Venkataraman
Nature Communications  Published:16 February 2024
DOI:https://doi.org/10.1038/s41467-024-45707-z

光を使って単一分子デバイスを正確に制御する(Using Light to Precisely Control Single-Molecule Devices)

Abstract

Metal-metal contacts, though not yet widely realized, may provide exciting opportunities to serve as tunable and functional interfaces in single-molecule devices. One of the simplest components which might facilitate such binding interactions is the ferrocene group. Notably, direct bonds between the ferrocene iron center and metals such as Pd or Co have been demonstrated in molecular complexes comprising coordinating ligands attached to the cyclopentadienyl rings. Here, we demonstrate that ferrocene-based single-molecule devices with Fe-Au interfacial contact geometries form at room temperature in the absence of supporting coordinating ligands. Applying a photoredox reaction, we propose that ferrocene only functions effectively as a contact group when oxidized, binding to gold through a formal Fe3+ center. This observation is further supported by a series of control measurements and density functional theory calculations. Our findings extend the scope of junction contact chemistries beyond those involving main group elements, lay the foundation for light switchable ferrocene-based single-molecule devices, and highlight new potential mechanistic function(s) of unsubstituted ferrocenium groups in synthetic processes.

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