Nanoscale Aspects of Chiral Nucleation and Propagation

Latter, Edward G.; Raval, Rasmita

doi:10.1002/9781118867334.ch10

Cited by 1 publication

(1 citation statement)

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“…Fabricating spatially uniform chiral thin films with atomic-scale control of their handedness is not only relevant for applications; it is also important to reach a profound understanding of the interactions between the chiral building blocks and the mechanisms allowing transmission of their chirality to long-scale arrangements because the details of these structures can have a substantial influence on their enantioselectivity . In the last decades, surface spectroscopies and scanning probe microscopies have provided important insights on chiral 2D assembly which complemented with advances in theoretical modeling and have delivered understanding into the balance of interactions that determine the system behavior. ,, However, chiral assembling beyond the first layer remains a less-investigated topic. , …”

Section: Introductionmentioning

confidence: 99%

Enantiopure Supramolecular Motifs of Self-Assembled Diamine-Based Chiral Molecules on Cu(100)

et al. 2018

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The assembly of two Diphenylethylenediamine enantiomers, separately deposited on Cu(100), is investigated from the first stages of two-dimensional crystallization to the nucleation and growth of the second layer. By means of Scanning Tunneling Microscopy, we show that the chirality of the enantiomers is expressed at different levels of molecular organization. Below the monolayer completion, a disordered phase coexists with domains of a square lattice aligned with the principal crystallographic directions of the substrate. The intrinsic chirality of the molecules is only manifested through specific features contained within the corresponding unit cell. For increasing coverage, this arrangement is accompanied by a second square structure, which appears to be clockwise or counterclockwise rotated with respect to the Cu(100) directions depending on the enantiomer. The nucleation of molecular chains on top of the aligned square structure gives rise to a second layer exhibiting a striped-like configuration with remarkable left-or right-handed helicity that mirrors that of the particular enantiomer. The nearly flat configuration of the first layer molecules is confirmed by angular dependent X-ray absorption experiments and supported by molecular dynamics simulations.

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