On-surface synthesis of triangulene trimers via dehydration reaction

Suqin Cheng, Zhijie Xue, Can Li, Yufeng Liu, Longjun Xiang, Youqi Ke, Kaking Yan, Shiyong Wang () and Ping Yu ()
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Suqin Cheng: ShanghaiTech University
Zhijie Xue: ShanghaiTech University
Can Li: Shanghai Jiao Tong University
Yufeng Liu: Shanghai Jiao Tong University
Longjun Xiang: ShanghaiTech University
Youqi Ke: ShanghaiTech University
Kaking Yan: ShanghaiTech University
Shiyong Wang: Shanghai Jiao Tong University
Ping Yu: ShanghaiTech University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Triangulene and its homologues are of considerable interest for molecular spintronics due to their high-spin ground states as well as the potential for constructing high spin frameworks. Realizing triangulene-based high-spin system on surface is challenging but of particular importance for understanding π-electron magnetism. Here, we report two approaches to generate triangulene trimers on Au(111) by using surface-assisted dehydration and alkyne trimerization, respectively. We find that the developed dehydration reaction shows much higher chemoselectivity thus resulting in significant promotion of product yield compared to that using alkyne trimerization approach, through cutting the side reaction path. Combined with spin-polarized density functional theory calculations, scanning tunneling spectroscopy measurements identify the septuple (S = 3) high-spin ground state and quantify the collective ferromagnetic interaction among three triangulene units. Our results demonstrate the approaches to fabricate high-quality triangulene-based high spin systems and understand their magnetic interactions, which are essential for realizing carbon-based spintronic devices.

Date: 2022
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DOI: 10.1038/s41467-022-29371-9

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