Chirality variation from self-assembly on Ullmann coupling for the DBCh adsorbate on Au(111) and Ag(111).

ABSTRACT: On-surface Ullmann coupling has been considered an appealing approach for the precise fabrication of carbon-based covalent nanostructures under solution-free conditions. However, chirality has seldom been discussed in Ullmann reactions. In this report, self-assembled two-dimensional chiral networks are initially constructed in a large area on Au(111) and Ag(111) after adsorption of the prochiral precursor, 6,12-dibromochrysene (DBCh). Self-assembled phases are then transformed into organometallic (OM) oligomers after debromination, preserving the chirality; in particular, the formation of scarcely reported OM species on Au(111) is discovered herein. With the aryl-aryl bonding induced after intensive annealing, covalent chains are fabricated via the cyclodehydrogenation between chrys

SUBMITTER: Wang H 

PROVIDER: S-EPMC9972870 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature