Steric hindrance in the on-surface synthesis of diethynyl-linked anthracene polymers

Abstract

Hybrid sp-sp2 structures can be efficiently obtained on metal substrates via on-surface synthesis. The choice of both the precursor and of the substrate impacts on the effectiveness of the process and the stability of the formed structures. Here we demonstrate that using anthracene-based molecules as precursor, the formation on Au(111) of polymers hosting sp carbon chains is affected by the steric hindrance between aromatic groups. In particular, by scanning tunneling microscopy and density functional theory calculations we show that the de-metalation of organometallic structures induces a lateral separation of adjacent polymers preventing the formation of ordered domains.

References in corpus (6)

• Energy Gaps in Graphene Nanoribbons
• Crystallographic Etching of Few-Layer Graphene
• Synthesis of a mesoscale ordered 2D-conjugated polymer with semiconducting properties
• Tailoring topological order and π-conjugation to engineer quasi-metallic polymers
• Structural, Electronic, and Vibrational Properties of 2D Graphdiyne-Like Carbon Nanonetwork Synthesized on Au(111): Implications for the Engineering of sp-sp2 Carbon Nanostructures
• Graphdiynes interacting with metal surfaces: first-principles electronic and vibrational properties