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Direct observation of 4‐nitrophenyl disulfide produced from p‐nitrothiophenol in air by Raman spectroscopy

Abstract

Taking the fingerprint characteristics of Raman spectroscopy, the dimerization of p‐nitrothiophenol (PNTP) to 4‐nitrophenyl disulfide in air was investigated, which could be accelerated by the external laser illumination. The dimerization was qualitatively confirmed by both mass spectroscopy experimentally and by Raman spectrum simulated calculations theoretically and quantitatively analyzed by Raman spectroscopy in a simple and quick manner. On the basis of the inductively coupled plasma optical mass spectrometry analysis, the dimerization was possibly ignited by the trace metal residues as catalyst in the PNTP. This study clearly shows that it is very important to strictly and preciously control the experimental conditions of Raman measurement and other laser‐based spectroscopies to avoid any wrong conclusion during the characterization or identification. Different to the plasmon‐induced photochemical reactions, we reported the photochemical reaction of PNTP to 4‐nitrophenyl disulfide, which is free of the plasmoic effect from the metal nanostrucutres. On the other hand, the photochemical dimerization reaction may provide a new and important guideline for the formation of thiols to disulfides.

This paper clearly shows that it is very important to strictly and precisely control the experimental conditions of Raman measurement to avoid any wrong conclusion during the characterization or identification. Different to the plasmon‐induced photochemical reactions, we reported the photochemical reaction of p‐nitrothiophenol (PNTP) to nitrophenyl disulfide (NPDS), which is free of the plasmonic effect from the metal nanostructures. On the other hand, the photochemical dimerization reaction may provide a new and important guideline for the formation of thiols to disulfides.

Authors:   Yun Ling, Wen‐Chang Xie, Wei‐Li Wang, Meng‐Kai Li, Jing Tang, Guo‐Kun Liu, Run‐Wen Yan, De‐Yin Wu
Journal:   Journal of Raman Spectroscopy
Year:   2017
Pages:   n/a
DOI:   10.1002/jrs.5314
Publication date:   18-Dec-2017
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