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Description:

Helically coiled, semiconducting graphenic nanostructures show exceptional promise for nanoelectronics, yet their synthesis has remained challenging due to their inherently strained backbone and the difficulties associated with structural characterization. In this work, we demonstrate the synthesis and characterization of laterally π-extended polyhelicenes (EPHs), achieved through regioselective cyclodehydrogenation. Spectroscopic and microscopic analyses, including mass spectrometry, solid-state NMR, scanning-probe microscopy, and transmission electron microscopy, confirm the well-defined helical, layered architecture of the EPHs. Ultrafast terahertz spectroscopy reveals pronounced intra-helix photoconductivity, demonstrating their potential as carbon-based nanoscale conductors. The scalable synthetic approach described in this work unlocks the application potential of carbon-based helical nanostructures, paving the way for nanoinductors in nanoscale solenoids, spin-selective electronics, and future high-frequency nanoelectronic devices.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: helicenes, electron microscopy, polyaromatic hydrocarbons, terahertz spectroscopy

Date published: 2025-11-26

Publisher: American Chemical Society (ACS)

Journal:

• Journal of the American Chemical Society (ISSN: 00027863) vol. 147 issue. 47 p. 43842-43849

Funding:

• Werner Siemens-Stiftung
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 200021-228403
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 200021L-219983
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 51NF40-180604
• Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung CRSII5 213533
• Deutsche Forschungsgemeinschaft 437130745
• Johannes Gutenberg-Universit?t Mainz
• Science, Technology and Innovation Commission of Shenzhen Municipality JCYJ20220530143805012
• Science, Technology and Innovation Commission of Shenzhen Municipality KQTD20210811090142053
• Japan Society for the Promotion of Science JP19K24686
• Japan Society for the Promotion of Science JP23H04874
• Japan Society for the Promotion of Science JP24K01474
• Max-Planck-Gesellschaft
• Swiss Nanoscience Institute
• Okinawa Institute of Science and Technology Graduate University
• China Scholarship Council
• National Natural Science Foundation of China 52303382
• Shenzhen Key Laboratory of Functional Aggregate Materials ZDSYS20211021111400001

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1021/jacs.5c15494

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Updated at: 2025-11-28 12:30:07 +0900

Published on MDR: 2025-11-28 12:24:17 +0900