| Observations of carbon–carbon coupling of 4,4'-dibromo-p-terphenyl on Cu(110) surface at molecular level |
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| 作者姓名： | Xin-Li Leng Li-Li Song Yan Lu Xiao-Qing Liu Li Wang |
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| 作者单位： | a Department of Physics, Nanchang University, Nanchang 330031, China;
b Department of Chemistry, Nanchang University, Nanchang 330031, China |
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| 基金项目： | This work was financially supported by Natural Science Foundation of China (Nos. 61474059, U1432129 and 11504158) and National Key Basic Research Program of China (No. 2013CB934200). |
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| 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 the1–10] 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.
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Observations of carbon-carbon coupling of 4,4-dibromo-pterphenyl on Cu(110) surface at molecular level |
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| Xin-Li Leng,Li-Li Song,Yan Lu,Xiao-Qing Liu,Li Wang.Observations of carbon-carbon coupling of 4,4-dibromo-pterphenyl on Cu(110) surface at molecular level[J].Chinese Chemical Letters,2017,28(1):24-28. |
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| Authors: | Xin-Li Leng Li-Li Song Yan Lu Xiao-Qing Liu Li Wang |
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| Institution: | a Department of Physics, Nanchang University, Nanchang 330031, China;
b Department of Chemistry, Nanchang University, Nanchang 330031, China |
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| Abstract: | 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 the1-10] 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. |
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| Keywords: | Carbon-carbon coupling Ullmann coupling Organometallic intermediate Selective C-H activation Oligomer |
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