Optical and electrochemical investigation on one-step three electron reduction of [AuIII(Salen)]Cl to Au(0): a comprehensive analysis

IF 2.2 4区 化学 Q3 CHEMISTRY, MULTIDISCIPLINARY
Sontara Konwar Boruah, Hirendra Das, Prabin Kumar Boruah
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Abstract

This work presents a comprehensive study of the UV–Visible and fluorescence properties, as well as the redox behavior of the [AuIII(Salen)]Cl complex in acetonitrile. The [AuIII(Salen)]+ complex exhibited intriguing fluorescence and phosphorescence characteristics on an indium tin oxide (ITO)-coated glass plate when excited at wavelength λexc ~ 260 nm, with fluorescence emission observed at λems ~ 437 nm and phosphorescence at λems ~ 520 nm. The origin of fluorescence emission was attributed to the intra-ligand charge transfer effect, commonly known as the "Push–Pull" effect. The electrochemical behavior of [AuIII(Salen)]+ on a glassy carbon electrode (GCE) revealed a remarkable one-step three-electron reduction process, leading to the reduction of [AuIII(Salen)]+ to Au(0). Furthermore, the reduction of [AuI(Salen)] to Au(0) resulted in the removal of gold metal from the SalenH2 ligand. The electrochemical results suggested a mixed diffusion-adsorption redox process occurring at the GCE surface, indicating the involvement of both diffusion and adsorption during redox reactions. The cyclic voltammogram demonstrated the non-reversibility of the electrochemical redox reactions. Overall, the redox behavior of the [AuIII(Salen)]Cl complex proved to be intriguing, opening up avenues for further exploration and potential applications of this complex in various fields.

Graphical abstract

Abstract Image

Abstract Image

一步法三电子还原[AuIII(Salen)]Cl 至 Au(0)的光学和电化学研究:综合分析
这项工作全面研究了[AuIII(Salen)]Cl 复合物在乙腈中的紫外可见光和荧光特性以及氧化还原行为。当波长为 λexc ~ 260 nm 时,[AuIII(Salen)]+ 复合物在铟锡氧化物(ITO)镀膜玻璃板上显示出奇特的荧光和磷光特性,在 λems ~ 437 nm 处观察到荧光发射,在 λems ~ 520 nm 处观察到磷光。荧光发射的原因是配体内电荷转移效应,即通常所说的 "推拉 "效应。玻璃碳电极(GCE)上[AuIII(Salen)]+ 的电化学行为显示了一个显著的一步三电子还原过程,导致[AuIII(Salen)]+ 还原成 Au(0)。此外,[AuI(Salen)]- 还原成 Au(0)时,金金属从 SalenH2 配体中脱落。电化学结果表明,在 GCE 表面发生了扩散和吸附混合氧化还原过程,表明在氧化还原反应中扩散和吸附都参与其中。循环伏安图显示了电化学氧化还原反应的不可逆性。总之,[AuIII(Salen)]Cl 复合物的氧化还原行为证明是耐人寻味的,为该复合物在各个领域的进一步探索和潜在应用开辟了途径。
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来源期刊
CiteScore
4.40
自引率
8.30%
发文量
230
审稿时长
5.6 months
期刊介绍: JICS is an international journal covering general fields of chemistry. JICS welcomes high quality original papers in English dealing with experimental, theoretical and applied research related to all branches of chemistry. These include the fields of analytical, inorganic, organic and physical chemistry as well as the chemical biology area. Review articles discussing specific areas of chemistry of current chemical or biological importance are also published. JICS ensures visibility of your research results to a worldwide audience in science. You are kindly invited to submit your manuscript to the Editor-in-Chief or Regional Editor. All contributions in the form of original papers or short communications will be peer reviewed and published free of charge after acceptance.
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