Switching the on‐surface orientation of oxygen‐functionalized helicene

Helicenes represent an important class of chiral organic material with promising optoelectronic properties. Hence, functionalization of surfaces with helicenes is a key step toward new organic materials devices. The deposition of a heterohelicene containing two furano groups and two hydroxyl groups...

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Published inChirality (New York, N.Y.) Vol. 36; no. 2; pp. e23642 - n/a
Main Authors Voigt, Jan, Hasan, Mohammed, Wäckerlin, Christian, Karnik, Anil V., Ernst, Karl‐Heinz
Format Journal Article
LanguageEnglish
Published United States Wiley Subscription Services, Inc 01.02.2024
Subjects
Adsorbates
chiral crystallization
Heat treatment
helicenes
Hydroxyl groups
Low temperature
Optoelectronics
Organic materials
scanning tunneling microscopy
Substrates
surface science
Ultrahigh vacuum
chiral crystallization
helicenes
scanning tunneling microscopy
surface science
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Summary:Helicenes represent an important class of chiral organic material with promising optoelectronic properties. Hence, functionalization of surfaces with helicenes is a key step toward new organic materials devices. The deposition of a heterohelicene containing two furano groups and two hydroxyl groups onto copper(111) surface in ultrahigh vacuum leads to different adsorbate modifications. At low coverage and low temperature, the molecules tend to lie on the surface in order to maximize van der Waals contact with the substrate. Thermal treatment leads to deprotonation of the hydroxyl groups and in part into a reorientation from lying into a standing adsorbate mode. With increasing coverage and temperature, oxygen‐functionalized helicenes switch their adsorbate mode on a copper surface.
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ISSN:0899-0042
1520-636X
DOI:10.1002/chir.23642