On-Surface Formation of One-Dimensional Polyphenylene
through Bergman Cyclization
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Abstract
On-surface fabrication of covalently
interlinked conjugated nanostructures
has attracted significant attention, mainly because of the high stability
and efficient electron transport ability of these structures. Here,
from the interplay of scanning tunneling microscopy imaging and density
functional theory calculations, we report for the first time on-surface
formation of one-dimensional polyphenylene chains through Bergman
cyclization followed by radical polymerization on Cu(110). The formed
surface nanostructures were further corroborated by the results for
the ex situ-synthesized molecular product after Bergman cyclization.
These findings are of particular interest and importance for the construction
of molecular electronic nanodevices on surfaces