title: Real-Time Sensing of O-Phenylenediamine Oxidation on Gold Nanoparticles.
abstract: Real-time monitoring of chemical reactions is still challenging as well as important to study reaction mechanisms and reaction kinetics. Herein, we demonstrated the real-time monitoring of o-phenylenediamine (OPD) oxidation on the surface of gold nanoparticles by surface-enhanced Raman spectroscopy (SERS). The oxidation mechanism and the reaction kinetics were investigated on the basis of the SERS spectrum variation and the related density functionalized theory calculation. It was shown that the oxidation of OPD in the presence of copper ions was a two-step process of the deprotonation of the amino group on the aromatic rings and the rearrangement of the electron cloud to a π-conjugated system, which may open a new door to comprehensively understand the reaction process.
authors.affiliation: Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. yurujia@mail.ecust.edu.cn.
authors.forename: Ru-Jia
authors.initials: RJ
authors.lastname: Yu
authors.affiliation: Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. jiajiasun@mail.ecust.edu.cn.
authors.forename: Jia-Jia
authors.initials: JJ
authors.lastname: Sun
authors.affiliation: Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. songheng@mail.ecust.edu.cn.
authors.forename: Heng
authors.initials: H
authors.lastname: Song
authors.affiliation: College of Chemistry and Chemical Engineering, Qiqihar University, 42 Culture Road, Qiqihar 161006, China. tjz6666@163.com.
authors.forename: Jing-Zhi
authors.initials: JZ
authors.lastname: Tian
authors.affiliation: Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. daweili@ecust.edu.cn.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Li
authors.affiliation: Key Laboratory for Advanced Materials, Shanghai Key Laboratory of Functional Materials Chemistry & School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China. ytlong@ecust.edu.cn.
authors.forename: Yi-Tao
authors.initials: YT
authors.lastname: Long
keywords: oxidation of o-phenylenediamine; real-time monitoring; surface-enhanced Raman spectroscopy