Dechlorinated Ullmann Coupling Reaction of Aryl Chlorides on Ag(111): A Combined STM and XPS Study. Issue 18 (16th July 2019)

• Record Type: Journal Article
• Authors: Dai, Jingxin; Zhao, Wenhui; Xing, Lingbo; Shang, Jian; Ju, Huanxin; Zhou, Xiong; Liu, Jing; Chen, Qiwei; Wang, Yongfeng; Zhu, Junfa; Wu, Kai
• Is Part Of: Chemphyschem. Volume 20:Issue 18(2019)
• Page Start: 2367
• Page End: 2375
• Publication Date: 2019-07-16
• Subjects: dechlorinated Ullmann coupling reaction -- On‐Surface Synthesis -- scanning tunneling microscopy -- synchrotron X-ray photoemission spectroscopy -- surface species evolution; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.201900264
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: Surface‐assisted Ullmann coupling was widely applied to construct various molecular nanostructures on surfaces due to its reliability and controllability. By using 4, 4′′‐dichloro‐1, 1′:3′, 1′′‐terphenyl (DCTP) as the precursor, covalently bonded zig‐zag oligophenylene chains and hexagonal hyperbenzene rings, e. g., [18]‐honeycombenes, were successfully fabricated on Ag(111) via dechlorinated Ullmann coupling reaction. Stepwise annealing was applied to investigate the reaction process in detail. Scanning tunneling microscopy and synchrotron X‐ray photoemission spectroscopy were utilized to explore the thermal evolution of the DCTP molecules on Ag(111) under ultrahigh vacuum conditions, evidencing the existence of intact DCTP molecules, chemisorbed Cl atoms, covalently bonded DCTP dimers as well as organometallic C−Ag−C‐containing intermediates. These results may help understand dechlorinated Ullmann coupling reaction of aryl chlorides on metal surfaces. Abstract : Chains and rings : Thermal evolution during dechlorinated Ullmann coupling of 4, 4′′‐dichloro‐1, 1′:3′, 1′′‐terphenyl on Ag(111) is investigated in a combined scanning tunneling microscopy and synchrotron‐based X‐ray photoelectron spectroscopy study.