On-Surface
Reaction between Tetracarbonitrile-Functionalized
Molecules and Copper Atoms
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Abstract
Self-assembly
at surfaces has proven to be very efficient in creating
ordered, atomically controlled organic nanostructures. On-surface
synthesis has recently emerged as a promising strategy to create stable
structures bound by strong and irreversible covalent bonds. Here we
present on-surface reaction between pyrazino phenanthroquinoxaline-tetracarbonitrile
(PPCN) molecules and copper atoms on a Au(111) substrate. The reaction
is monitored in ultrahigh vacuum conditions by scanning tunneling
microscopy and X-ray photoelectron spectroscopy (XPS). After a 475
K annealing, phthalocyanine cyclization occurs around a copper atom;
the increase of annealing temperature to 540 and 675 K leads to the
formation of 1D and 2D phthalocyanine polymers, respectively. This
reaction is confirmed by the modification of the Cu 2p<sub>3/2</sub> and C 1s XPS spectra upon annealing