Growth of Hydrogen-Bonded Molecular Aggregates on a Thin Alkali Halide Layer: Quinacridone on KCl/Ag(100)

Humberg, Niklas; Guo, Qinmin; Bredow, Thomas; Sokolowski, Moritz

doi:10.1021/acs.jpcc.3c04402

Cited by 1 publication

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“…We describe how the presence of the step edges influences the azimuthal orientations of the chains. QA is a good candidate for such experiments because strong intermolecular hydrogen bonds (H-bonds) [ 19 ] support the growth of long 1D chains of parallel oriented QA molecules, both in bulk crystals and on surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Directed growth of quinacridone chains on the vicinal Ag(35 1 1) surface

Humberg,

Grönwoldt,

Sokolowski

2024

Beilstein J. Nanotechnol.

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The formation of self-assembled domains and chains of monomolecular width of quinacridone (QA) on the vicinal Ag(35 1 1) surface was investigated by scanning tunneling microscopy and low-energy electron diffraction. The focus was on the influence of the steps on the QA structures and their preferential azimuthal orientations with the aim of achieving a selective orientation. After deposition at a sample temperature of 300 K, QA forms the same kind of molecular chains as on the nominally flat Ag(100) surface because of strong intermolecular hydrogen bonds, which we reported in a previous publication [Humberg, N.; Bretel, R.; Eslam, A.; Le Moal, E.; Sokolowski, M. J. Phys. Chem. C 2020, 124, 24861–24873]. The vicinal surface leads to one additional chain orientation, which is parallel to the Ag step edges. However, most chains nucleate on the Ag terraces between steps with four distinct azimuthal orientations that are identical to those on Ag(100), and which are determined by the interactions with the (100) surface. At 300 K, the chains grow across the Ag steps, which do not break the azimuthal chain orientations. In contrast, during the deposition at sample temperatures of 400 and 500 K, the nucleation of the chains takes place at the Ag step edges. Hence, these have a strong influence on the azimuthal orientation of the molecules, resulting in a preferential growth of the chains in two of the four azimuthal orientations. We explain this by the adaptation of favorable adsorption sites, which involve the replacement of Ag atoms by QA molecules with specific azimuthal orientations at the step edges.

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Section: Introductionmentioning

confidence: 99%

“…The chains exhibit a small set of distinct orientations, which are determined by the underlying substrates on all these surfaces. Furthermore, chains of QA have also been observed on insulating layers of KCl grown on Ag(100) or Cu(111) [ 19 , 26 ].…”

Section: Introductionmentioning

confidence: 99%