Volume 8, Issue 2
The mechanism research for the surface plasmon-catalysed reaction of the mercapto group substituted benzoic acid

Jiyu Wang, Jing Wang, Caiqing Ma, Meixia Zhang, Yong Ding, Peng Song & Fengcai Ma

J. At. Mol. Sci., 8 (2017), pp. 70-74.

Published online: 2017-08

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  • Abstract
In this study, we experimentally investigated the substituent effect on benzoic acid where the mercapto group was located in different positions, namely as 2-mercaptobenzoic acid (2-MBA), 3-mercaptobenzoic acid (3-MBA) and 4-mercaptobenzoic acid (4-MBA). The substituent effect was found to have an influence on the surface plasmon-catalysed reaction on the surface of the Ag4 atoms in the reaction of MBA with silver sol. In addition to the direct evidence from the surface-enhanced Raman scattering (SERS), the chemical enhancement mechanism for the generation of the MBA-Ag complex is presented. In contrast with the normal Raman scattering (NRS) spectra, new signals appeared in the SERS spectra of 2-MBA, 3-MBA and 4-MBA under the theoretical and experimental conditions. On investigation of the SERS spectra, the characteristic peaks of the C ≡ C bond have been demonstrated. The structural, atomic and chemical bond properties of the three types of MBAs indicate that the S atom of the mercapto group in the MBA molecules is the position site that attaches to the silver substrate through the bond of S…Ag, and under laser irradiation, “hot electrons ”  are generated between the surface of MBA and Ag4 atoms. With the effect of “hot electrons ” , the -COOH bond of the MBA molecules is broken, and then the two single carboxylate MBA molecules become dimerized thiophenol acetylene (TPA). To briefly consider the substituent effect, the SERS spectra of these three types of MBAs were specifically studied for the enhancement of the Raman signal intensity with a variational tendency evident. Therefore, the conclusion was reached that the substituent effect plays a vital role in the surface plasmon-catalysed reaction, where the changing of the surface-enhanced Raman intensity was demonstrated.
  • Keywords

Surface plasmon-catalysed reaction MBA thiophenol acetylene (TPA) normal Raman scattering (NRS) spectra surface-enhanced Raman scattering (SERS) spectra hot electron substituent effect

  • AMS Subject Headings

  • Copyright

COPYRIGHT: © Global Science Press

  • Email address

1014944214@qq.com (Jing Wang)

unknown - Meixia Zhang (Meixia Zhang)

yding@Inu.edu.cn (Yong Ding)

songpeng@Inu.edu.cn (Peng Song)

fcma@lnu.edu.cn (Fengcai Ma)

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@Article{JAMS-8-70, author = {Wang , Jiyu and Wang , Jing and Ma , Caiqing and Zhang , Meixia and Ding , Yong and Song , Peng and Ma , Fengcai}, title = {The mechanism research for the surface plasmon-catalysed reaction of the mercapto group substituted benzoic acid}, journal = {Journal of Atomic and Molecular Sciences}, year = {2017}, volume = {8}, number = {2}, pages = {70--74}, abstract = {In this study, we experimentally investigated the substituent effect on benzoic acid where the mercapto group was located in different positions, namely as 2-mercaptobenzoic acid (2-MBA), 3-mercaptobenzoic acid (3-MBA) and 4-mercaptobenzoic acid (4-MBA). The substituent effect was found to have an influence on the surface plasmon-catalysed reaction on the surface of the Ag4 atoms in the reaction of MBA with silver sol. In addition to the direct evidence from the surface-enhanced Raman scattering (SERS), the chemical enhancement mechanism for the generation of the MBA-Ag complex is presented. In contrast with the normal Raman scattering (NRS) spectra, new signals appeared in the SERS spectra of 2-MBA, 3-MBA and 4-MBA under the theoretical and experimental conditions. On investigation of the SERS spectra, the characteristic peaks of the C ≡ C bond have been demonstrated. The structural, atomic and chemical bond properties of the three types of MBAs indicate that the S atom of the mercapto group in the MBA molecules is the position site that attaches to the silver substrate through the bond of S…Ag, and under laser irradiation, “hot electrons ”  are generated between the surface of MBA and Ag4 atoms. With the effect of “hot electrons ” , the -COOH bond of the MBA molecules is broken, and then the two single carboxylate MBA molecules become dimerized thiophenol acetylene (TPA). To briefly consider the substituent effect, the SERS spectra of these three types of MBAs were specifically studied for the enhancement of the Raman signal intensity with a variational tendency evident. Therefore, the conclusion was reached that the substituent effect plays a vital role in the surface plasmon-catalysed reaction, where the changing of the surface-enhanced Raman intensity was demonstrated.}, issn = {2079-7346}, doi = {https://doi.org/10.4208/jams.071617.090517a}, url = {http://global-sci.org/intro/article_detail/jams/10573.html} }
TY - JOUR T1 - The mechanism research for the surface plasmon-catalysed reaction of the mercapto group substituted benzoic acid AU - Wang , Jiyu AU - Wang , Jing AU - Ma , Caiqing AU - Zhang , Meixia AU - Ding , Yong AU - Song , Peng AU - Ma , Fengcai JO - Journal of Atomic and Molecular Sciences VL - 2 SP - 70 EP - 74 PY - 2017 DA - 2017/08 SN - 8 DO - http://doi.org/10.4208/jams.071617.090517a UR - https://global-sci.org/intro/article_detail/jams/10573.html KW - Surface plasmon-catalysed reaction KW - MBA KW - thiophenol acetylene (TPA) KW - normal Raman scattering (NRS) spectra KW - surface-enhanced Raman scattering (SERS) spectra KW - hot electron KW - substituent effect AB - In this study, we experimentally investigated the substituent effect on benzoic acid where the mercapto group was located in different positions, namely as 2-mercaptobenzoic acid (2-MBA), 3-mercaptobenzoic acid (3-MBA) and 4-mercaptobenzoic acid (4-MBA). The substituent effect was found to have an influence on the surface plasmon-catalysed reaction on the surface of the Ag4 atoms in the reaction of MBA with silver sol. In addition to the direct evidence from the surface-enhanced Raman scattering (SERS), the chemical enhancement mechanism for the generation of the MBA-Ag complex is presented. In contrast with the normal Raman scattering (NRS) spectra, new signals appeared in the SERS spectra of 2-MBA, 3-MBA and 4-MBA under the theoretical and experimental conditions. On investigation of the SERS spectra, the characteristic peaks of the C ≡ C bond have been demonstrated. The structural, atomic and chemical bond properties of the three types of MBAs indicate that the S atom of the mercapto group in the MBA molecules is the position site that attaches to the silver substrate through the bond of S…Ag, and under laser irradiation, “hot electrons ”  are generated between the surface of MBA and Ag4 atoms. With the effect of “hot electrons ” , the -COOH bond of the MBA molecules is broken, and then the two single carboxylate MBA molecules become dimerized thiophenol acetylene (TPA). To briefly consider the substituent effect, the SERS spectra of these three types of MBAs were specifically studied for the enhancement of the Raman signal intensity with a variational tendency evident. Therefore, the conclusion was reached that the substituent effect plays a vital role in the surface plasmon-catalysed reaction, where the changing of the surface-enhanced Raman intensity was demonstrated.
Jiyu Wang , Jing Wang, Caiqing Ma , Meixia Zhang, Yong Ding, Peng Song & Fengcai Ma . (2019). The mechanism research for the surface plasmon-catalysed reaction of the mercapto group substituted benzoic acid. Journal of Atomic and Molecular Sciences. 8 (2). 70-74. doi:10.4208/jams.071617.090517a
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