Thermodynamics and selectivity of two-dimensional metallo-supramolecular self-assembly resolved at molecular scale |
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Authors: | Shi Ziliang Liu Jun Lin Tao Xia Fei Liu Pei Nian Lin Nian |
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Institution: | Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China. |
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Abstract: | We investigated the thermodynamic processes of two-dimensional (2D) metallo-supramolecular self-assembly at molecular resolution using scanning tunneling microscopy and variable-temperature low-energy electron diffraction. On a Au(111) substrate, tripyridyl ligands coordinated with Cu in a twofold Cu-pyridyl binding mode or with Fe in a threefold Fe-pyridyl binding mode, forming a 2D open network structure in each case. The network structures exhibited remarkable thermal stability (600 K for the Cu-coordinated network and 680 K for the Fe-coordinated network). The Fe-pyridyl binding was selected thermodynamically as well as kinetically in self-assembly involving both modes. The selectivity can be effectively suppressed in a specifically designed self-assembly route. |
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