On-Surface Synthesis of Nanographenes and Graphene Nanoribbons on Titanium Dioxide.

ABSTRACT: The formation of two types of nanographenes from custom designed and synthesized molecular precursors has been achieved through thermally induced intramolecular cyclodehydrogenation reactions on the semiconducting TiO₂(110)-(1×1) surface, confirmed by the combination of high-resolution scanning tunneling microscopy (STM) and spectroscopy (STS) measurements, and corroborated by theoretical modeling. The application of this protocol on differently shaped molecular precursors demonstrates the ability to induce a highly efficient planarization reaction both within strained pentahelicenes as well as between vicinal phenyl rings. Additionally, by the combination of successive Ullmann-type polymerization and cyclodehydrogenation reactions, the archetypic 7-armchair graphene nanoribbons

SUBMITTER: Zuzak R 

PROVIDER: S-EPMC9933590 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature