Raman scattering of α‐toluenethiol adsorbed on silver sol

Lee, Tae Geol; Kim, Kwan; Kim, Myoung Soo

doi:10.1002/jrs.1250220607

Cited by 26 publications

(24 citation statements)

References 27 publications

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“…The scaled frequency at 556 cm −1 was attributed to the v 6a mode, corresponding to the observed peak at 558 cm −1 . In the previous study, the 558 cm −1 peak was thought from the CH 2 Cl moiety, while the peak frequency at 472 cm −1 was thought from the v 6a mode . We reassigned the observed frequency at 813 and 816 cm −1 to the v 1 ring breathing mode, in good accordance with the scaled frequency at 809 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…In the previous study, the 558 cm −1 peak was thought from the CH 2 Cl moiety, while the peak frequency at 472 cm −1 was thought from the v 6a mode . We reassigned the observed frequency at 813 and 816 cm −1 to the v 1 ring breathing mode, in good accordance with the scaled frequency at 809 cm −1 . The v 12 mode is mainly originated from the trigonal deformation of the phenyl ring .…”

Section: Resultsmentioning

confidence: 99%

“…This confirms the existence of vibrational coupling of the v 1 , v 12 , and v 18a modes. The 1185 cm −1 frequency can be attributed to the v 9a mode, in agreement with the previous assignment . The scaled frequency at 1614 cm −1 is attributed to the v 8a mode, corresponding to the observed frequency at 1607 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

“…For the v 11 , v 17a , and v 5 modes, their scaled frequencies are well compared with the observed frequencies at 764, 965, and 982 cm −1 . For the v 10a mode, it is possibly invisible infrared and Raman signals in experimental measurements, but our predicted frequency may be at 837 cm −1 compared with the observed frequency at 847 cm −1 , close to 849 cm −1 in benzyl cyanide and 846 cm −1 in benzyl amine . The predicted vibrational frequency also accords with the observed band at 835 ± 25 cm −1 for the v 10a mode in single‐substituted benzene derivatives .…”

Section: Resultsmentioning

confidence: 99%

“…To understand the significant changes, it is necessary to first reinvestigate the vibrational assignments of benzyl chloride and benzyl radical themselves. The vibrational assignments of benzyl chloride in pure liquid state were reported on the basis of infrared and Raman spectroscopy, but there are many discrepancies in vibrational analysis of benzyl chloride experimentally and theoretically . For benzyl radical, the transient species were formed during photochemical reactions, so that the vibrational bands were observed from fluorescence emission spectroscopy in early studies .…”

Section: Introductionmentioning

confidence: 99%

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Theoretical study of normal Raman spectra and SERS of benzyl chloride and benzyl radical on silver electrodes

Chen

Panneerselvam

et al. 2016

J Raman Spectroscopy

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Electrochemical surface‐enhanced Raman spectroscopy has been used to characterize adsorbed species widely but rarely to reaction intermediates on electrodes. In previous studies, the observed surface‐enhanced Raman spectroscopy signals were proposed from benzyl species due to the electrochemical reduction of benzyl chloride on silver electrode surfaces. In this work, we reinvestigated the vibrational assignments of benzyl chloride and benzyl radical as the reaction intermediate. On the basis of density functional theory calculations and normal mode analysis, our systematic results provide more reasonable new assignments for both surface species. Further, we investigated adsorption configurations, binding energies, and vibrational frequency shifts of benzyl radical interacting with silver. Our calculated results show that the wagging vibration displays significant vibrational frequency shift, strong coupling with some intramolecular modes in the phenyl ring, and significant changes in intensity of Raman signals. The study also provides absolute Raman intensity in benzyl halides and discusses the enhancement effect mainly due to the binding interaction with respect to free benzyl radical. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Theoretical study of normal Raman spectra and SERS of benzyl chloride and benzyl radical on silver electrodes

Chen

Panneerselvam

et al. 2016

J Raman Spectroscopy

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Hydroxyl Radical Generation and DNA Nuclease Activity: A Mechanistic Study Based on a Surface‐Immobilized Copper Thioether Clip‐Phen Derivative

Romo

Abreu

Paulo

et al. 2016

Chemistry A European J

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Coordination compounds of copper have been invoked as major actors in processes involving the reduction of molecular oxygen, mostly with the generation of radical species the assignment for which has, so far, not been fully addressed. In the present work, we have carried out studies in solution and on surfaces to gain insights into the nature of the radical oxygen species (ROS) generated by a copper(II) coordination compound containing a thioether clip-phen derivative, 1,3-bis(1,10-phenanthrolin-2-yloxy)-N-(4-(methylthio)benzylidene)propan-2-amine (2CP-Bz-SMe), enabling its adsorption/immobilization to gold surfaces. Whereas surface plasmon resonance (SPR) and electrochemistry of the adsorbed complex indicated the formation of a dimeric Cu(I) intermediate containing molecular oxygen as a bridging ligand, scanning electrochemical microscopy (SECM) and nuclease assays pointed to the generation of a ROS species. Electron paramagnetic resonance (EPR) data reinforced such conclusions, indicating that radical production was dependent on the amount of oxygen and H2 O2 , thus pointing to a mechanism involving a Fenton-like reaction that results in the production of OH(.) .

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Investigation of the adsorption of 2‐phenyl‐1‐ethanethiol on silver by Raman spectroscopy

Lee

Kim

1993

J Raman Spectroscopy

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Surface-enhanced Raman scattering (SERS) of 2-phenyl-l-ethanethiol was investigated in a silver sol. The molecule was found to be chemisorbed dissociatively on the silver surface by rupture of its S-H bond. Although both the tram and gauche conformers around the C -1 4 -2 axis could exist on the surface with submonolayer coverage, the tram conformer seemed to be dominant as the bulk concentration of the molecule was sufficient for full monolayer coverage. In the submonolayer coverage limit, a gradual tram-to-gauche transition was found to occur on the surface with increase in borohydride concentration in the sol solution. The vibrational assignment of the molecule in the liquid phase was also refined by using the SERS data.

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Raman scattering of α‐toluenethiol adsorbed on silver sol

Cited by 26 publications

References 27 publications

Theoretical study of normal Raman spectra and SERS of benzyl chloride and benzyl radical on silver electrodes

Theoretical study of normal Raman spectra and SERS of benzyl chloride and benzyl radical on silver electrodes

Hydroxyl Radical Generation and DNA Nuclease Activity: A Mechanistic Study Based on a Surface‐Immobilized Copper Thioether Clip‐Phen Derivative

Investigation of the adsorption of 2‐phenyl‐1‐ethanethiol on silver by Raman spectroscopy

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