Kinetic control over the chiral-selectivity in the formation of organometallic polymers on a Ag(110) surface

R. S.Koen Houtsma, Floris van Nyendaal, Meike Stöhr*

*Bijbehorende auteur voor dit werk

OnderzoeksoutputAcademicpeer review

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Methods to control chiral-selectivity in molecular reactions through external inputs are of importance, both from a fundamental and technological point of view. Here, the self-assembly of prochiral 6,12-dibromochrysene monomers on Ag(110) is studied using scanning tunneling microscopy. Deposition of the monomers on a substrate held at room temperature leads to the formation of 1D achiral organometallic polymers. When the monomers are instead deposited on a substrate held at 373 K, homochiral organometallic polymers consisting of either the left- or right-handed enantiomer are formed. Post-deposition annealing of room temperature deposited samples at >373 K does not transform the achiral 1D organometallic polymers into homochiral ones and thus, does not yield the same final structure as if depositing onto a substrate held at the same elevated temperature. Furthermore, annealing promotes neither the formation of 1D covalently-coupled polymers nor the formation of graphene nanoribbons. Our results identify substrate temperature as an important factor in on-surface chiral synthesis, thereby demonstrating the importance of considering kinetic effects and the decisive role they can play in structure formation.

Originele taal-2English
Aantal pagina's6
TijdschriftCommunications chemistry
Nummer van het tijdschrift1
StatusPublished - 5-mrt.-2024

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