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| 題名: | Potential - Controlled adsorption of dithieno[2,3-b:3,2-d]thiophene derivatives on electrified Au(1 1 1): As probed by in situ scanning tunneling microscopy |
| 作者: | 姚學麟;Luo, ShuRong;Yau, ShuehLin;Vegiraju, Sureshraju;Huang, Chu-Yun;Chen, Ming-Chou |
| 貢獻者: | 理學院化學學系 |
| 關鍵詞: | Intermolecular interaction;Ordered bimolecular adlayer;Perfluorophenyl substituent;Phase transition |
| 日期: | 2015-02-15 |
| 上傳時間: | 2026-04-21 14:34:38 (UTC+8) |
| 出版者: | Elsevier BV;Elsevier B.V |
| 摘要: | 摘要： •Dithienothiophenes (DTT) and its derivatives were deposited on Au(111) from solution.•Intermolecular interactions determined how two different molecules were coadsorbed.•Intermolecular hydrogen bonds guided admolecules to arrange in a windmill pattern.•Potential determined the degree of molecular ordering on the Au(111) electrode. In situ scanning tunneling microscopy (STM) has been used to examine the spatial structures of mixed molecular adlayers of dithieno[2,3-b:3,2-d]thiophene diphenyl (C6H5–DTT–C6H5, 1), 2-pentafluorophenyl-6-phenyldithieno [2,3-b:3′,2′-d]thiophene (C6F5–DTT–C6H5, 2), and 2,6-bis(pentafluorophenyl) dithieno[3,2-b;2′,3′-d]thiophene (C6F5–DTT–C6F5, 3) codeposited on Au(111) from dosing solutions made of combinations of 1, 2, and 3. 1 and 3 were coadsorbed mainly in a mixed adlattice characterized as (313×313)R13.9° – 1+3, and some minor striped structures due to 1. The phenyl and perfluorophenyl groups in 1 and 3 interacted so strongly that they arranged spatially in pairs. Three pairs of 1 and 3 formed a windmill pattern with their terminals converging to a distorted hexagon, which enabled formation of intermolecular hydrogen bonds between 1 and 3. By contrast, 2 and 3 were coadsorbed in segregated domains made of individual molecules. Electrostatic repulsion between C6F5 – groups in 2 and 3 appeared to exceed attraction between C6H5 and C6F5 groups, which drove segregation of 2 and 3. The relative strength of adsorption of these molecules on Au(111) was inferred from their coverages determined from STM results, which suggests a descending sequence of 1>3>2. Electrochemical potential controlled all spatial structures, as ordered structures were observed only between 0.2 and 0.7V (vs. reversible hydrogen electrode).
出版者： Elsevier B.V
出版日期： 2015-02-15
出處： Journal of electroanalytical chemistry (Lausanne, Switzerland), 2015-02, Vol.739, p.43-48
版權： 2014 Elsevier B.V.
識別號： ISSN: 1572-6657
識別號： EISSN: 1873-2569
識別號： DOI: 10.1016/j.jelechem.2014.12.015 |
| 顯示於類別: | [化學學系] 期刊論文
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