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Hu P, Li X, Li B, Han X, Zhang F, Chou KC, Chen Z, Lu X. Molecular Coupling between Organic Molecules and Metal. J Phys Chem Lett 2018; 9:5167-5172. [PMID: 30141630 DOI: 10.1021/acs.jpclett.8b01765] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Molecular couplings at interfaces play important roles in determining the performance of nanophotonics and molecular electronics. In this Letter, using femtosecond sum frequency generation to trace free-induction decay of vibrationally excited aromatic thiol molecules immobilized on metal with and without the bridged methylene group(s), metal surface free electron-coupled and uncoupled phenyl C-H stretching vibrational modes were identified, with dephasing times of ∼0.28 and ∼0.60 ps, respectively. For thiols on Au with the bridged methylene group(s) (benzyl mercaptan and phenylethanethiol), both the coupled and uncoupled modes were observed; for thiol on Au without the bridged methylene group (thiophenol), only the coupled mode was observed. This indicates that the bridged methylene group(s) serving as a spacer can be used to adjust the molecular coupling between the phenyl vibration and surface free electrons. The experimental approach can be used to tune molecular couplings in advanced nanophotonics and molecular electronics.
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Affiliation(s)
- Pengcheng Hu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Xu Li
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Bolin Li
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Xiaofeng Han
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Furong Zhang
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
| | - Keng C Chou
- Department of Chemistry , University of British Columbia , Vancouver , BC , Canada V6T 1Z1
| | - Zhan Chen
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Xiaolin Lu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering , Southeast University , Nanjing 210096 , China
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Fu L, Chen SL, Gan W, Wang HF. Cross-Propagation Sum-Frequency Generation Vibrational Spectroscopy. CHINESE J CHEM PHYS 2016. [DOI: 10.1063/1674-0068/29/cjcp1512248] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Omiya T, Arnolds H. Coverage dependent non-adiabaticity of CO on a copper surface. J Chem Phys 2014; 141:214705. [DOI: 10.1063/1.4902540] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Arnolds H, King DA, Lane IM. Inducing non-adiabatic effects through coadsorption: CO+NO on iridium. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.01.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Frischkorn C, Wolf M. Femtochemistry at metal surfaces: nonadiabatic reaction dynamics. Chem Rev 2007; 106:4207-33. [PMID: 17031984 DOI: 10.1021/cr050161r] [Citation(s) in RCA: 274] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Christian Frischkorn
- Freie Universität Berlin, Fachbereich Physik, Arnimallee 14, 14195 Berlin, Germany.
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Lane IM, King DA, Liu ZP, Arnolds H. Real-time observation of nonadiabatic surface dynamics: the first picosecond in the dissociation of NO on iridium. PHYSICAL REVIEW LETTERS 2006; 97:186105. [PMID: 17155559 DOI: 10.1103/physrevlett.97.186105] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2006] [Indexed: 05/12/2023]
Abstract
Ultrafast laser pulses on Ir{111} cause a highly temperature-dependent redshift of the intramolecular stretch frequency of adsorbed NO. The time-resolved spectral changes are driven by charge transfer of hot electrons to the NO 2pi*d antibonding orbital, which leads to bending of NO and internal bond weakening. The nonadiabatic change in the NO adsorption geometry follows the charge transfer within a time scale of 700 femtoseconds. This geometrical change is the same as the mechanism predicted for thermally induced dissociation.
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Affiliation(s)
- Ian M Lane
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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