Molecular honeycomb lattice in the monolayer of triptycene derivative Trip-Phz on Ag(111) Rie Suizu 1,2 , Ryohei Nemoto 3 , Ryo Ushiroguchi 1 , Ryota Sema 1 , Takashi Uchihashi 3 , Kunio Awaga 1 1 Department of Chemistry and IRCCS, Nagoya University, Japan, 2 JST-PRESTO, Japan, 3 National Institute for Materials Science, Japan Recently,self-assembled 2D architectures on solid surfaceshave attracted attention in organic electronics andspintronics fields. Although many organic molecules usually tend to form island-like aggregates on substrates, it is possible to form the 2D ordered structuresby introducing strong intermolecular interactions in the in-plane direction. In this perspective, we focused on triptycene derivativesconsisting of polyhedral π-conjugated planes whose normals make an angle of 60 degrees. The possibility ofshowing exotic electronic properties such as DiracFermion, like graphene, motivates us to studyhoneycomb lattices formed by triptycene derivatives. In our former study, we reported the formation of molecular honeycomb lattices using a triptycene derivative, Trip-Phz, due to face-to-face πoverlaps in crystals obtained from THF solutions [1] . This honeycombstructure possesses a channel with ca. 10 Å diameter, which is enough large to accommodate the dopant molecules for band-filling control.Band calculations based on this crystal structure revealed that it contains a topological flat band as well as a Dirac cone. In this presentation, we report the molecular arrangement and electronic structure of triptycene derivatives, Trip-Phz, on Ag(111) surface. The STM image of Trip-Phz on Ag(111) shows a honeycomb lattice as observed in crystals, but with a slightly smaller lattice constant.This indicates some interaction between the molecule and the substrate. To investigate doping by small molecules through the void space of the honeycomb lattice, the subsequent deposition of C 60 resulted in a honeycomb lattice structure with C 60 in the void space. We will also present the band structures of Trip-Phz on some substrates.
References 1. R. Ushiroguchi, Y. Shuku, R. Suizu, and K. Awaga, Cryst. Growth Des ., 2020 , 20, 7593.
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