Self-Assembly and Local Manipulation of Au-Pyridyl Coordination Networks on Metal Surfaces

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Yang SongYu-Qiang Ma

Abstract

Using scanning tunnelling microscopy (STM), we demonstrate that Au-pyridyl coordination can be used to assemble two-dimensional coordination network structures on metal surfaces. The polymorphism of the coordination network structures can be manipulated at both the micro- and nanoscale. Using the same organic ligand, we assembled two distinct polymorphic network structures, which were assisted by threefold Au-pyridyl coordination on Ag(111) with predeposited Au atoms (α-network), and by twofold Au-pyridyl coordination on Au(111) (β-network), respectively. Specifically on the Au(111) surface, single-oriented β-network domains as large as ≈400 nm were selected by thermal annealing. We ascribe this global control strategy to distinct Au bonding modes tuned by molecule-substrate interactions. Using an STM tip, we succeeded in creating α-network domains (≈10 nm) locally within the homogeneous β-network domain areas on Au(111) in a controlled manner.

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Citations

May 6, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Linghao YanPeter Liljeroth

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