Molecular Recognition Effects in the Surface Diffusion of Large Organic Molecules: The Case of Violet Lander

TL;DR

This study uses atomistic molecular dynamics simulations to investigate how the surface diffusion of large organic molecules, like Violet Lander, is influenced by molecular-surface interactions and commensurability effects, revealing insights into lock-and-key behavior.

Contribution

It provides a detailed atomistic understanding of the physical basis for lock-and-key behavior in large organic molecules on Cu(110) surfaces, highlighting the role of molecular-surface commensurability.

Findings

Lock-and-key behavior arises from molecular and surface atomic spacing interactions.

Accidental commensurability between molecule and surface dimensions is crucial.

Insights could enable engineering of molecules with tailored surface interactions.

Abstract

Violet Lander (VL) (C108H104) is a large organic molecule that when deposited on Cu (110) exhibited lock-and-key like behavior (Otero et al., Nature Mater. 3, 779 (2004)). In this work we report on a detailed fully atomistic molecular dynamics study of this phenomenon. Our results show that it has its physical basis in the interplay of the molecular hydrogens and the Cu(110) atomic spacing, which is a direct consequence of an accidental commensurability between molecule and surface dimensions. This knowledge could be used to engineer new molecules capable of displaying lock-and-key behavior with new potential applications in nanotechology.