Chirality transfer by epitaxial mismatch in multi-layered homochiral molecular films

Disappearing Enantiomorphs: Single Handedness in Racemate Crystals

“…To determine which mirror domain contained which enantiomer in the second layer, we performed a control experiment with a double layer of M ‐[7]H (Figure 3 a). Although the pure‐enantiomer double‐layer symmetry was hexagonal instead of oblique for the second‐layer racemic structure,28 the STM contrast for a single molecule was again characterized by the distinctive four‐lobe pattern. Its handedness was identical to that of the molecules in the ρ 2nd layer, that is, the lobe sequence (red–green–yellow) runs counterclockwise.…”

Self-assembly of an asymmetrically functionalized [6]helicene at liquid/solid interfaces

“…Work in this direction has been already initiated. [6][7][8] Recently, Stöhr et al reported spontaneous resolution in the surface self-assembly of a symmetrically functionalized [7]helicene vacuum-deposited on Cu(111). 9 Here, we report the first STM investigation of asymmetrically functionalized helicenes and their assemblies on various surfaces at the liquid/solid interface, opening up possibilities for practical applications relying on deposition and self-assembly from solutions.…”

“…Inspired by the success in the adsorption of helicenes on several coinage metal surfaces, [6][7][8][9]11 we chose to study the selfassembly of AH on the Au(111) surface. This is similar to Cu(111) in affinity to molecules, yet stable to oxygen and conditions for liquid/solid experiments.…”

Intermediate structures in two-dimensional molecular self-assembly

“…4(a) top, C 30 H 18 , [7 ] H] on metal surfaces is an exciting chapter of surface chirality. While on nickel surfaces no extended ordering phenomena has been found [24][25][26], a pronounced transfer of chirality into mono-and multilayered structures, manifested by the formation of extended chiral motifs, was observed for the pure enantiomers on Cu(111) [27,28]. Interestingly, mirror domains have been observed for the racemate at the same surface, indicating at a first glance a lateral resolution of the enantiomers [29].…”