文献类型：期刊文献

英文题名：Resolving Quinoid Structure in Poly(para-phenylene) Chains

作者：Yuan, Bingkai[1];Li, Can[1];Zhao, Yan[1];Groening, Oliver[3];Zhou, Xieyu[4];Zhang, Pengfei[5];Guan, DanDan[1,2];Li, Yaoyi[1,2];Zheng, Hao[1,2];Liu, Canhua[1,2];Mai, Yiyong[5];Liu, Peinian[6];Ji, Wei[4];Jia, Jinfeng[1,2];Wang, Shiyong[1,2]

机构：[1]Shanghai Jiao Tong Univ, Sch Phys & Astron, Key Lab Artificial Struct & Quantum Control, Minist Educ,Shenyang Natl Lab Mat Sci, Shanghai 200240, Peoples R China;[2]Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China;[3]Empa, Swiss Fed Labs Mat Sci & Technol, CH-8600 Dubendorf, Switzerland;[4]Renmin Univ, Dept Phys, Beijing 100872, Peoples R China;[5]Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200240, Peoples R China;[6]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China

年份：2020

卷号：142

期号：22

起止页码：10034

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20202508850241);WOS:【SCI-EXPANDED(收录号:WOS:000538526500019)】；

基金：We thank Prof. R. Fasel and Prof. N. Lin for fruitful discussions. S.W. acknowledges the financial support from the National Natural Science Foundation of China (No. 11874258) and Fok Ying Tung Foundation. This work is also supported by the Ministry of Science and Technology of China (Grant Nos. 2016YFA0301003 and 2016YFA0300403), the National Natural Science Foundation of China (Grant Nos. 11521404, 11634009, 11874256, 11574202, 11790313, 11674226, U1632102, 11674222, U1632272, 21774076, and 11861161003), and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB28000000).

语种：英文

外文关键词：Electronic properties - Structural properties - Scanning tunneling microscopy - Aromatic compounds - Copper compounds

摘要：The quinoid structure, a resonance structure of benzenoid, gives rise to peculiar chemical reactivity and physical properties. A complete characterization of its geometric and electronic properties on the atomic scale is of vital importance to understand and engineer the chemical and physical properties of quinoid molecules. Here, we report a real-space structural and electronic characterization of quinoid poly(para-phenylene) (PPP) chains by using noncontact atomic force microscopy and scanning tunneling microscopy. Our results reveal that quinoid PPP chains adopt a coplanar adsorption configuration on Cu(111) and host in-gap states near Fermi level. In addition, intra- and interchain hopping of quinoid structure are observed, indicative of a quasiparticle behavior originating from charge-lattice interactions. The experimental results are nicely reproduced by tight-binding calculations. Our study provides a comprehensive understanding of the structural and electronic properties of quinoid PPP chains in real space and may be further extended to address the dynamics of nonlinear excitations in quinoid molecules.