Observations of carbon–carbon coupling of 4,4''-dibromo-p-terphenyl on Cu(110) surface at molecular level  

作　　者：Xin-Li Leng Li-Li Song Yan Lu Xiao-Qing Liu Li Wang 

机构地区：[1]Department of Physics, Nanchang University, Nanchang 330031, China [2]Department of Chemistry, Nanchang University, Nanchang 330031, China

出　　处：《Chinese Chemical Letters》2017年第1期24-28,共5页中国化学快报（英文版）

基　　金：financially supported by Natural Science Foundation of China (Nos. 61474059, U1432129 and 11504158);National Key Basic Research Program of China (No. 2013CB934200)

摘　　要：The carbon–carbon couplings of 4,4＇＇-dibromo-p-terphenyl（DBTP） on Cu（110） surface have been investigated at a single molecular level by scanning tunneling microscopy. After annealing at 353 K, a mixture of parallel non-organometallic and organometallic intermediates of DBTP molecules along the[1–10] direction of the surface has been observed. Further annealing at 393 K causes one group of molecules to form oligomers with para-para and para-meta motifs via Ullmann reaction and the other group of molecules to synthesize oligomers with meta-meta motifs via direct carbon–carbon coupling reaction. Statistical results directly reveal that the occurrence of reaction type is strongly related to the initial binding configuration of DBTP molecules.The carbon–carbon couplings of 4,4＇＇-dibromo-p-terphenyl（DBTP） on Cu（110） surface have been investigated at a single molecular level by scanning tunneling microscopy. After annealing at 353 K, a mixture of parallel non-organometallic and organometallic intermediates of DBTP molecules along the[1–10] direction of the surface has been observed. Further annealing at 393 K causes one group of molecules to form oligomers with para-para and para-meta motifs via Ullmann reaction and the other group of molecules to synthesize oligomers with meta-meta motifs via direct carbon–carbon coupling reaction. Statistical results directly reveal that the occurrence of reaction type is strongly related to the initial binding configuration of DBTP molecules.

关 键 词：Carbon-carbon coupling Ullmann coupling Organometallic intermediate Selective C-H activation OLIGOMER 

分 类 号：O647.11[理学—物理化学]