Multicomponent Assembly of Supramolecular Coordination Polygons on a Au(111) Surface
Multicomponent Assembly of Supramolecular Coordination Polygons on a Au(111) Surface
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Au(111) 表面超分子配位多边形的多组分组装
DOI:
10.1021/jp408504b
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发表时间:
2013-10
影响因子:
3.7
通讯作者:
Nian Lin
中科院分区:
文献类型:
--
作者:
Tao Lin;Xue Song Shang;Pei Nian Liu;Nian Lin
We have studied the self-assembly of a series of multicomponent cyclic supramolecular polygons on a Au(111) surface using scanning tunneling microscopy and kinetic Monte Carlo simulations. Our results indicate that while closed polygons or cages efficiently self-assemble in three dimensions at appropriate temperatures and concentrations, chain structures are formed predominantly and the yield of cyclic polygon structures is very low in two dimensions independent of temperature and concentration. This substantial shift in the ring–chain equilibrium can be attributed to subtle competition between kinetic and thermodynamic controls. Simulations suggest that on a surface, where the translational and rotational freedom of the molecules are restricted and intramolecular bond flipping is hindered, the low-energy reaction pathways that are essential for the formation of cyclic structures are blocked. In addition, microscopy images suggest that surface defects provide kinetic traps that further reduce the yield of...
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