In situ Raman monitoring of electroreductive dehalogenation of aryl halides at an Ag/aqueous solution interface. Issue 6 (23rd January 2023)

• Record Type: Journal Article
• Authors: Zhou, Ying-Hua; Jiang, Chen-Chen; Yu, Zhou; Wang, Ya-Hao; Zheng, Ju-Fang; Zhou, Xiao-Shun
• Is Part Of: Analytical methods. Volume 15:Issue 6(2023)
• Page Start: 771
• Page End: 777
• Publication Date: 2023-01-23
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/d2ay02060b
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : Shell-isolated nanoparticle-enhanced Raman spectroscopy has been successfully applied to probe electroreductive dehalogenation of aryl halides at an Ag electrode. Abstract : Electroreductive dehalogenation as an efficient and green approach has attracted much attention in pollution remediation. Herein, we have employed a shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) technique to in situ probe the electroreductive dehalogenation process of aryl halides with thiol groups at Ag/aqueous solution interfaces. It is found that 4-bromothiophenol (BTP) and 4-chlorothiophenol (CTP) can turn into mixed products of 4, 4′-biphenyldithiol (BPDT) and thiophenol (TP) as the electrode potential decreases. The conversion ratios estimated from the Raman intensity variations of C–Cl and C–Br vibrations are 44% and 58% for CTP and BTP in neutral solution, respectively. Furthermore, the quantitative analysis of benzene ring vibrations reveals a C–C cross coupling between the benzene free radical intermediate and adjacent TP product, which results in increased selectivity for biphenyl products at negative potentials.