Toward Molecular Textiles: Synthesis and Characterization of Molecular Patches

This works describes a new step into the assembly of molecular
textiles by the use of covalent templating. To establish a well-
founded base and to tackle pre-mature obstacles, expected
during the fabrication of the desired 2D-material, we opted to
investigate the in-solution synthesis of molecular patches e. g.
cut-outs of a textile. A bi-functional cross-shaped monomer was
designed, synthesized and was in-detail characterized by means
of 1H-NMR and chiro-optical spectroscopy. In addition, x-ray
structure crystallography was used to assess the absolute
configuration. The monomer was used in an in-solution
oligomerization to assemble the molecular patches via imine
condensation, which revealed the formation of predominately
dimeric patches. The imine-oligomer mixtures were further
analyzed by reduction and cleaved to investigate the conditions
required post mono-layer assembly. All reaction stages were
followed by FT-IR and 1H-NMR analysis. Finally, we address the
adsorption of the cross-shaped monomer onto a Au(111)
surface, via high vacuum electrospray deposition. The subse-
quent annealing of the interface induced the on-surface imine
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condensation reaction, leading to unidimensional oligomers co-
adsorbed with clusters of cyclic-dimers. Nc-AFM analysis
revealed the tridimensional molecular structures, and together
with electrospray deposition technique showed to be a
promising pathway to investigate potential monomer candi-
dates.