Phase-separated indenofluorene arrays stabilized by hydrogen and halogen bonds on Au(111)

Jong Hwan Park, Min Hui Chang, Won Jun Jang, Seungwu Han, Se Jong Kahng

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1 Citation (Scopus)


Indenofluorene, which consists of a 6-5-6-5-6 fused-ring structure, is a semiconducting molecule with possible applications in optoelectronic devices. Bulk crystal structures, molecular front orbitals, and on-surface polymerized indenofluorene have recently been studied, but self-assembled structures on the surface have not yet been reported. Here, we report the array structure of 2,8-dibromoindeno[1,2-b]fluorene-6,12-dione on Au(111) studied using scanning tunneling microscopy. We proposed an alternating-tread stair structure as the molecular model for the monolayer molecular islands, which show strong shape anisotropy. The model can be explained by four O⋯H hydrogen bonds and one Br⋯Br halogen bond per molecule, as supported by density functional theory calculations. Although they prefer intermixed heteroprochiral structures in bulk layers, our study shows that these molecules can form phase-separated homoprochiral structures on the surface, leading to potential applications in molecular chiral separation.

Original languageEnglish
Article number013201
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Issue number1
Publication statusPublished - 2022 Jan 1

Bibliographical note

Funding Information:
The authors gratefully acknowledge financial support from the National Research Foundation of Korea (Grants Nos.

Publisher Copyright:
© 2021 Author(s).

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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