| Title | Steering Effect of Bromine on Intermolecular Dehydrogenation Coupling of Poly(p-phenylene) on Cu(111) |
| Authors | Lin, Yuxuan Huang, Zhichao Wen, Xiaojie Rong, Wenhui Peng, Zhantao Diao, Mengxiao Xing, Lingbo Dai, Jingxin Zhou, Xiong Wu, Kai |
| Affiliation | Peking Univ, Coll Chem & Mol Engn, BNLMS, Beijing 100871, Peoples R China |
| Keywords | ON-SURFACE SYNTHESIS ATOMIC BROMINE ACTIVATION PHENYLENE ENERGY CHAINS PHASE WIRES |
| Issue Date | 22-Dec-2020 |
| Publisher | ACS NANO |
| Abstract | Among the multitudinous methodologies to steer on-surface reactions, less attention has been paid to the effect of externally introduced halogen atoms. Herein, highly selective trans-dehydrogenation coupling at the specific meta-C-H site of two poly(ii-phenylene) molecules, p-quaterphenyl (Ph-4) and p-quinquephenyl (Ph-5) is achieved on Cu(111) by externally introduced bromine atoms. Scanning tunneling microscopy/spectroscopy experiments reveal that the formed molecular assembly structure at a stoichiometric ratio of 4:1 for Br to Ph-4 or 5:1 for Br to Ph-5 can efficiently promote the reactive collision probability to trigger the trans-coupling reaction at the meta-C-H site between two neighboring Ph-4 or Ph-5 molecules, leading to an increase in the coupling selectivity. Such Br atoms can also affect the electronic structure and adsorption stability of the reacting molecules. It is conceptually demonstrated that externally introduced halogen atoms, which can provide an adjustable halogen-to-precursor stoichiometry, can be employed to efficiently steer on-surface reactions. |
| URI | http://hdl.handle.net/20.500.11897/602217 |
| ISSN | 1936-0851 |
| DOI | 10.1021/acsnano.0c06830 |
| Indexed | SCI(E) |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ |
