文献类型：期刊文献

英文题名：On-surface synthesis of poly(p-phenylene ethynylene) molecular wires via in situ formation of carbon-carbon triple bond

作者：Shu, Chen-Hui[1,2];Liu, Meng-Xi[3];Zha, Ze-Qi[3,4];Pan, Jin-Liang[3,4];Zhang, Shao-Ze[1,2];Xie, Yu-Li[1,2];Chen, Jian-Le[1,2];Yuan, Ding-Wang[5];Qiu, Xiao-Hui[3,4];Liu, Pei-Nian[1,2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Key Lab Adv Mat, Shanghai Key Lab Funct Mat Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[3]Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[5]Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

年份：2018

卷号：9

外文期刊名：NATURE COMMUNICATIONS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000435082000004)】；

基金：This work was supported by the National Natural Science Foundation of China (Project Nos. 21421004, 21425310, 21561162003, 21603045, and 21672059), the Program for Eastern Scholar Distinguished Professor, the Programme of Introducing Talents of Discipline to Universities (B16017), the Ministry of Science and Technology of China (Grant No. 2016YFA0200700, 2017YFA0205000), and CAS-PKU Pioneer Cooperation Team.

语种：英文

摘要：The carbon-carbon triple bond (-C C-) is an elementary constituent for the construction of conjugated molecular wires and carbon allotropes such as carbyne and graphyne. Here we describe a general approach to in situ synthesize -C C- bond on Cu(111) surface via homocoupling of the trichloromethyl groups, enabling the fabrication of individual and arrays of poly(p-phenyleneethynylene) molecular wires. Scanning tunneling spectroscopy reveals a delocalized electronic state extending along these molecular wires, whose structure is unraveled by atomically resolved images of scanning tunneling microscopy and noncontact atomic force microscopy. Combined with density functional theory calculations, we identify the intermediates formed in the sequential dechlorination process, including surface-bound benzyl, carbene, and carbyne radicals. Our method overcomes the limitation of previous on-surface syntheses of -C C-incorporated systems, which require the precursors containing alkynegroup; it therefore allows for a more flexible design and fabrication of molecular architectures with tailored properties.