文献类型：期刊文献

英文题名：Ladder Phenylenes Synthesized on Au(111) Surface via Selective [2+2] Cycloaddition

作者：Li, Deng-Yuan[1];Qiu, Xia[2,4,5];Li, Shi-Wen[1];Ren, Yin-Ti[3];Zhu, Ya-Cheng[1];Shu, Chen-Hui[1];Hou, Xiao-Yu[2,4];Liu, Mengxi[2,4];Shi, Xing-Qiang[3];Qiu, Xiaohui[2,4];Liu, Pei-Nian[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Frontiers Sci Ctr Mat & Dynam Chem, Key Lab Adv Mat & Feringa Nobel Prize Scientist J, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Natl Ctr Nanosci & Technol, CAS Ctr Excellence Nanosci, CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China;[3]Hebei Univ, Coll Phys Sci & Technol, Baoding 071002, Peoples R China;[4]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[5]Peking Univ, Acad Adv Interdisciplinary Studies, Beijing 100871, Peoples R China

年份：2021

卷号：143

期号：33

起止页码：12955

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20213610862365);WOS:【SCI-EXPANDED(收录号:WOS:000691789500009)】；

基金：This work was supported by the National Natural Science Foundation of China (21925201, 91845110, 21972032, 21790353, 21721002, 21425310, and 21978049), Shanghai Municipal Science and Technology Major Project (2018SHZDZX03), Natural Science Foundation of Shanghai (20ZR1414200), the Programme of Introducing Talents of Discipline to Universities (B16017), the Ministry of Science and Technology of China (2017YFA0205000), the Strategic Priority Research Program of Chinese Academy of Sciences (XDB36000000), the Scientific Instrument Developing Project of the Chinese Academy of Sciences (GJJSTD20200005), Advanced Talents Incubation Program of Hebei University (521000981390), and the Program for Eastern Scholar Distinguished Professor. We thank the High-performance Computing Center of Hebei University and the Research Center of Analysis and Test of East China University of Science and Technology for help in the characterization.

语种：英文

外文关键词：Scanning tunneling microscopy - Aromatic compounds - Density functional theory - Sodium chloride - Electronic properties - Metal substrates

摘要：Ladder phenylenes (LPs) composed of alternating fused benzene and cyclobutadiene rings have been synthesized in solution with a maximum length no longer than five units. Longer polymeric LPs have not been obtained so far because of their poor stability and insolubility. Here, we report the synthesis of linear LP chains on the Au(111) surface via dehalogenative [2+2] cycloaddition, in which the steric hindrance of the methyl groups in the 1,2,4,5-tetrabromo-3,6-dimethylbenzene precursor improves the chemoselectivity as well as the orientation orderliness. By combining scanning tunneling microscopy and noncontact atomic force microscopy, we determined the atomic structure and the electronic properties of the LP chains on the metallic substrate and NaCl/Au(111). The tunneling spectroscopy measurements revealed the charged state of chains on the NaCl layer, and this finding is supported by density functional theory calculations, which predict an indirect bandgap and antiferromagnetism in the polymeric LP chains.