Lateral π-extended helical nanographenes with large spin polarization

The possibility that current passing through an organic molecule becomes spin-polarized is highly intriguing. Amongst these molecules, helicene units have recently been shown to exhibit such a chiral-induced spin selectivity (CISS) effect. Thus, helical nanographenes (NGs), whose core building block is a helicene unit, are natural candidates for generating CISS. However, reports on the CISS effect in helical nanographenes (NGs) remain limited, primarily due to the lack of a suitable molecular platform for detecting spin-selective transport. In this work, we have developed a synthetic strategy using pre-fused key bonds in oligophenylene precursors and successfully synthesized lateral extended NGs that incorporate either single or double undecabenzo[7]helicene units with high yields. The resultant lateral extended helical NGs display excellent chiroptical properties including strong circular dichroism and large dissymmetry factors. Furthermore, magneto-conductive atomic force microscopy (mc-AFM) and magnetoresistance (MR) measurements show clear evidence for spin polarization of the current with a large spin polarization of up to 80% and a robust MR of 1.5% at room temperature. Together with theoretical modeling, our results identify lateral extended helical NGs as promising quantum materials for future organic spintronic devices.

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Publication Details

Journal
Chemical Science
Published
2025-01-01
DOI
https://doi.org/10.1039/d5sc03887a
Citations
2
Primary Topic
Synthesis and Properties of Aromatic Compounds
Type
article
Field-Weighted Citation Impact
1.87

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article

Lateral π-extended helical nanographenes with large spin polarization

Honglong Shi, Yutao Sang, Ji Ma, S. Parkin et al.
2 citations
Chemical Science
Synthesis and Properties of Aromatic Compounds
1.87
article

Lateral π-extended helical nanographenes with large spin polarization

Honglong Shi, Yutao Sang, Ji Ma, S. Parkin, Hartmut Komber, Lucas M. K. Tang, Elif Ünsal, Arezoo Dianat, Wenhui Niu, Chi Fang, Juti Rani Deka, Fu‐Peng Wu, Rafael Gutiérrez, Alexey A. Popov, Fupin Liu, Yubin Fu
article en
2 citations

Abstract

The possibility that current passing through an organic molecule becomes spin-polarized is highly intriguing. Amongst these molecules, helicene units have recently been shown to exhibit such a chiral-induced spin selectivity (CISS) effect. Thus, helical nanographenes (NGs), whose core building block is a helicene unit, are natural candidates for generating CISS. However, reports on the CISS effect in helical nanographenes (NGs) remain limited, primarily due to the lack of a suitable molecular platform for detecting spin-selective transport. In this work, we have developed a synthetic strategy using pre-fused key bonds in oligophenylene precursors and successfully synthesized lateral extended NGs that incorporate either single or double undecabenzo[7]helicene units with high yields. The resultant lateral extended helical NGs display excellent chiroptical properties including strong circular dichroism and large dissymmetry factors. Furthermore, magneto-conductive atomic force microscopy (mc-AFM) and magnetoresistance (MR) measurements show clear evidence for spin polarization of the current with a large spin polarization of up to 80% and a robust MR of 1.5% at room temperature. Together with theoretical modeling, our results identify lateral extended helical NGs as promising quantum materials for future organic spintronic devices.

Chemical ScienceVol. 16(45)
Nanjing Normal University (CN), Fudan University (CN), Leibniz Institute for Solid State and Materials Research (DE), Max Planck Institute of Microstructure Physics (DE), Max Planck Institute for Chemical Physics of Solids (DE), Max Bergmann Zentrum für Biomaterialien (DE), Leibniz Institute of Polymer Research (DE), Center for Systems Biology Dresden (DE), Academy of Opto-Electronics (CN), University of Chinese Academy of Sciences (CN), Technische Universität Dresden (DE)
European Commission, Deutsche Forschungsgemeinschaft, Weizmann Institute of Science, National Natural Science Foundation of China, Technische Universität Dresden, Max-Planck-Gesellschaft, Helmholtz-Zentrum Berlin für Materialien und Energie
Openalex Percentile: Top 14%
Synthesis and Properties of Aromatic Compounds
1.87
DOIOpen Access PDFOpenAlex
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