Journal
ACS NANO
Volume 16, Issue 4, Pages 6506-6514Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.2c00831
Keywords
surface-confined reaction; on-surface synthesis; desulfurization reaction; conjugated polymers; scanning tunneling microscopy; X-ray photoelectron spectroscopy
Categories
Funding
- Ministry of Science and Technology [2017YFA0205002]
- National Natural Science Foundation of China [21790053, 51821002]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- NSERC of Canada
- FRQNT, Quebec
- Jilin Normal University
- Canada Research Chair program
- FRQNT
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Surface-confined reactions are a powerful method for synthesizing low-dimensional organic materials. Understanding the reaction pathways can enable the rational synthesis of various molecules and polymers. In this study, different reaction pathways of tetrathienylbenzene and its extended congener on Cu(111) were investigated using scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations.
Surface-confined reactions represent a powerful approach for the precise synthesis of low-dimensional organic materials. A complete understanding of the pathways of surface reactions would enable the rational synthesis of a wide range of molecules and polymers. Here, we report different reaction pathways of tetrathienylbenzene (T1TB) and its extended congener tetrakis(dithienyl)benzene (T2TB) on Cu(111), investigated using scanning tunneling microscopy, X-ray photoelectron spectroscopy, and density functional theory calculations. Both T1TB and T2TB undergo desulfurization when deposited on Cu(111) at room temperature. Deposition of T1TB at 453 K yields pentacene through desulfurization, hydrogen transfer, and a cascade of intramolecular cyclization. In contrast, for T2TB the intramolecular cyclization stops at anthracene and the following intermolecular C-C coupling produces a conjugated ladder polymer. We show that tandem desulfurization/C-C coupling provides a versatile approach for growing carbon-based nanostructures on metal surfaces.
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