NCAFM2023 Programme Booklet

Friday 1000-1020

TOPOLOGY SELECTIVITY OF A CONFORMATIONALLY FLEXIBLE PRECURSOR

Liangliang Cai, Andrew T. S. Wee*

Department of Physics, National, University of Singapore, Singapore 117542 Email: phyweets@nus.edu.sg

Conformational arrangements in nanoarchitectures determine the overall shape as well as the potential properties. It is generally believed that conformational diversity leads to uncontrollable or disordered structures in on-surface self-assembly and synthesis. However, by employing a conformationally flexible precursor, 2,4,6-tris(3-bromophenyl)-1,3,5-triazine (mTBPT), we demonstrate two-dimensional distorted Kagome lattice p3, (333) by supramolecular self-assembly and achieve tuning of the metastable phases, including the homochiral porous network and distorted Kagome lattice p3, (333) by steering deposition rates on a cold Ag(111) substrate. The distorted Kagome lattice is energetically unfavorable but can be trapped at a high deposition rate. Besides, we also achieved the topology selectivity of the conformationally flexible precursor mTBPT on Cu(111) by doping selenium. By a combination of high-resolution scanning tunneling microscopy/spectroscopy, non-contact atomic force microscopy and density functional theory calculations, we revealed the supramolecular tiling of the conformationally flexible precursor, and the topology selectivity could be steered by appropriate doping on specific substrate. These results could extend the knowledge of self-assembly and on-surface synthesis of conformational flexible precursors.

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Ag(111)

Cu(111)

high selectivity

Fig. Supramolecular tiling of the conformationally flexible precursor mTBPT on Ag(111), and the topology selectivity on Cu(111) by selenium doping. References [1] Liangliang Cai, Yuli Huang, Dingguan Wang, Wenjing Zhang, Zhuo Wang,* and Andrew T. S. Wee,* J. Phys. Chem. Lett. 2022, 13 , 2180−2186. [2] Liangliang Cai and Andrew T. S. Wee, Topology Selectivity of a Conformationally Flexible Precursor by Selenium Doping, in preparation

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