Abstract
We report on the influence of the surface structure and the reaction kinetics in the bottom‐up fabrication of porous nanoribbons on silver surfaces using low‐temperature scanning tunneling microscopy. The porous carbon nanoribbons are fabricated by the polymerization of 1,3,5‐tris(3‐bromophenyl)benzene directly on the Ag surface using an Ullmann‐type reaction in combination with dehydrogenative coupling reactions. We demonstrate the successful on‐surface synthesis of porous nanoribbons on Ag(111) and Ag(100) even though the self‐assemblies of the intermediate organometallic structures and covalently‐linked polymer chains are different on both surfaces. Furthermore, we present the formation of isolated porous nanoribbons by kinetic control. Our results give valuable insights into the role of substrate‐induced templating effects and the reaction kinetics in the on‐surface synthesis of conformationally flexible molecules.
Highlights
Scheme 1) on Ag(111) and Ag(100) based on high-resolution scanning tunneling microscopy (STM) experiments at low temperatures
In a second reaction step, the conformational flexibility of mTBPB facilitates the formation of porous carbon nanoribbons from the polymer chains with periodic pores on Ag(111)[7] and Ag(100)
We report on the critical role of the surface structure and the reaction kinetics in the bottom-up fabrication of porous nanoribbons on Ag
Summary
Scheme 1) on Ag(111) and Ag(100) based on high-resolution scanning tunneling microscopy (STM) experiments at low temperatures. In a first reaction step, polymer chains with periodic pores form from Cs-conformers after an Ullmann-type coupling reaction. C Ag C bonds in the intermediate organometallic complexes after debromination template the high conformational selectivity of Cs-conformers in the polymer chains. In a second reaction step, the conformational flexibility of mTBPB facilitates the formation of porous carbon nanoribbons from the polymer chains with periodic pores on Ag(111)[7] and Ag(100). The motivation to understand the nanoribbon formation on the Ag(111) vs Ag(100) lattice results from the observation that organometallic intermediates in on-surface synthesis are in. We report on the critical role of the surface structure and the reaction kinetics in the bottom-up fabrication of porous nanoribbons on Ag. We compare the reaction pathway of. This study will provide further interesting insights into Ullmann-type reactions on Ag(100), which has rarely been addressed the Ullmann-type reaction is a workhorse in on-surface synthesis
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