Self-Assembly of Linear Three-Ring Aromatic Thiols on Au(111)
Verena Müller, Anna-Laurine Gaus, Daniel Hüger, Julian Picker, Christof Neumann, Max von Delius, Andrey Turchanin
TL;DR
This study explores how certain aromatic thiols self-assemble on gold surfaces, forming structured monolayers with specific molecular arrangements.
Contribution
The paper introduces new insights into the self-assembly behavior of linear three-ring aromatic thiols with different terminal groups on Au(111) surfaces.
Findings
TPT, FTPT, CF3TPT, and PyBPT form densely packed SAMs with hexagonal unit cells of 21.55 Ų per molecule.
NTPT SAMs exhibit coexisting hexagonal and squared structures with areas of 21.55 and 42.25 Ų per molecule.
XPS, LEED, and STM techniques were used to determine the structural properties of the SAMs.
Abstract
We report on the self-assembly of linear three-ring aromatic thiols on Au(111)/mica substrates. Our study examines terphenylthiol (TPT) derivatives with distinct terminal groups −F (FTPT), −CF3 (CF3TPT) and −NO2 (NTPT) as well as a pyridinebiphenyl (PyBPT) compound. Using complementary surface science techniquesX-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and scanning tunneling microscopy (STM)we elucidate the structural properties of the resulting self-assembled monolayers (SAMs). The TPT, FTPT, CF3TPT and PyBPT molecules form densely packed SAMs with hexagonal unit cells exhibiting an area of 21.55 Å2 per molecule. For the NTPT SAM, two different molecular arrangements were observed to coexist: a hexagonal structure and a squared structure, with areas per molecule of 21.55 and 42.25 Å2, respectively.
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Taxonomy
TopicsMolecular Junctions and Nanostructures · Surface Chemistry and Catalysis · Organic Chemistry Cycloaddition Reactions