文献类型：期刊文献

英文题名：Steering On-Surface Polymerization with Metal-Directed Template

作者：Lin, Tao[1];Shang, Xue Song[2,3];Adisoejoso, Jinne[1];Liu, Pei Nian[2,3];Lin, Nian[1]

机构：[1]Hong Kong Univ Sci & Technol, Dept Phys, Hong Kong, Hong Kong, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：135

期号：9

起止页码：3576

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20131116121127);WOS:【SCI-EXPANDED(收录号:WOS:000315936700046)】；

基金：This work was supported financially by the Hong Kong Research Grants Council (project no. 603611), the National Natural Science Foundation of China (project nos. 21172069 and 21190033), the Innovation Program of Shanghai Municipal Education Commission (project no. 12ZZ050), and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Macromolecules - Size distribution - Chemical bonds - Intelligent systems - Polymerization - Scanning tunneling microscopy - Process control

摘要：On-surface polymerization represents a novel bottom-up approach for producing macromolecular structures. To date, however, most of the structures formed using this method exhibit a broad size distribution and are disorderly adsorbed on the surface. Here we demonstrate a strategy of using metal-directed template to control the on-surface polymerization process. We chose a bifunctional compound which contains pyridyl and bromine end groups as the precursor. Linear template afforded by pyridyl-Cu-pyridyl coordination effectively promoted Ullmann coupling of the monomers on a Au(111) surface. Taking advantage of efficient topochemical enhancement owing to the conformation flexibility of the Cu pyridyl bonds, macromolecular porphyrin structures that exhibit a narrow size distribution were synthesized. We used scanning tunneling microscopy and kinetic Monte Carlo simulation to gain insights into the metal-directed polymerization at the single molecule level. The results reveal that the polymerization process profited from the rich chemistry of Cu which catalyzed the C-C bond formation, controlled the size of the macromolecular products, and organized the macromolecules in a highly ordered manner on the surface.