Direct Observation of Thiolate Displacement Reactions on Au(111): the Role of Physisorbed Disulfides
Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of (√3×√3)R30° methylthiolate on Au(111) by butylthiolate. The reaction was carried out at room temperature and constant saturation coverage, by exposing the methylthiolate-covered surface to dibutyl disulfide g...
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| Published in | Langmuir Vol. 21; no. 25; pp. 11684 - 11689 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
| Published |
Washington, DC
American Chemical Society
06.12.2005
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| Abstract | Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of (√3×√3)R30° methylthiolate on Au(111) by butylthiolate. The reaction was carried out at room temperature and constant saturation coverage, by exposing the methylthiolate-covered surface to dibutyl disulfide gas. The adsorbed methylthiolate was desorbed as dimethyl disulfide and the cross product methylbutyl disulfide, both identified by LOSMS. This shows that reaction occurs between adsorbed thiolates of different chain length at room temperature, while the kinetics indicate that a rapid equilibrium is established between immobile, chemisorbed thiolates, and highly mobile, physisorbed disulfides. |
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| AbstractList | Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of ( radical3x radical3)R30 degrees methylthiolate on Au(111) by butylthiolate. The reaction was carried out at room temperature and constant saturation coverage, by exposing the methylthiolate-covered surface to dibutyl disulfide gas. The adsorbed methylthiolate was desorbed as dimethyl disulfide and the cross product methylbutyl disulfide, both identified by LOSMS. This shows that reaction occurs between adsorbed thiolates of different chain length at room temperature, while the kinetics indicate that a rapid equilibrium is established between immobile, chemisorbed thiolates, and highly mobile, physisorbed disulfides. Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of (√3×√3)R30° methylthiolate on Au(111) by butylthiolate. The reaction was carried out at room temperature and constant saturation coverage, by exposing the methylthiolate-covered surface to dibutyl disulfide gas. The adsorbed methylthiolate was desorbed as dimethyl disulfide and the cross product methylbutyl disulfide, both identified by LOSMS. This shows that reaction occurs between adsorbed thiolates of different chain length at room temperature, while the kinetics indicate that a rapid equilibrium is established between immobile, chemisorbed thiolates, and highly mobile, physisorbed disulfides. |
| Author | Roper, Mark G Jones, Robert G |
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| Cites_doi | 10.1016/S0079-6816(00)00024-1 10.1016/S0039-6028(99)00985-1 10.1016/j.cplett.2004.02.109 10.1021/la9902385 10.1021/jp984286u 10.1016/S0039-6028(00)00811-6 10.1103/PhysRevLett.90.066102 10.1021/ja00237a018 10.1016/S0039-6028(99)00460-4 10.1021/jp0365054 10.1021/jp982338+ 10.1016/S0039-6028(99)00021-7 10.1021/jp0257911 10.1103/PhysRevB.57.12476 |
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| Snippet | Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of (√3×√3)R30° methylthiolate on Au(111) by butylthiolate. The... Line-of-sight mass spectroscopy (LOSMS) has been used to study the displacement reaction of ( radical3x radical3)R30 degrees methylthiolate on Au(111) by... |
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| SubjectTerms | Chemistry Exact sciences and technology General and physical chemistry |
| Title | Direct Observation of Thiolate Displacement Reactions on Au(111): the Role of Physisorbed Disulfides |
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