{"title":"Optical and electrochemical investigation on one-step three electron reduction of [AuIII(Salen)]Cl to Au(0): a comprehensive analysis","authors":"Sontara Konwar Boruah, Hirendra Das, Prabin Kumar Boruah","doi":"10.1007/s13738-024-03039-1","DOIUrl":null,"url":null,"abstract":"<div><p>This work presents a comprehensive study of the UV–Visible and fluorescence properties, as well as the redox behavior of the [Au<sup>III</sup>(Salen)]Cl complex in acetonitrile. The [Au<sup>III</sup>(Salen)]<sup>+</sup> complex exhibited intriguing fluorescence and phosphorescence characteristics on an indium tin oxide (ITO)-coated glass plate when excited at wavelength λ<sub>exc</sub> ~ 260 nm, with fluorescence emission observed at λ<sub>ems</sub> ~ 437 nm and phosphorescence at λ<sub>ems</sub> ~ 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 [Au<sup>III</sup>(Salen)]<sup>+</sup> on a glassy carbon electrode (GCE) revealed a remarkable one-step three-electron reduction process, leading to the reduction of [Au<sup>III</sup>(Salen)]<sup>+</sup> to Au(0). Furthermore, the reduction of [Au<sup>I</sup>(Salen)]<sup>−</sup> 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 [Au<sup>III</sup>(Salen)]Cl complex proved to be intriguing, opening up avenues for further exploration and potential applications of this complex in various fields.</p><h3>Graphical abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":676,"journal":{"name":"Journal of the Iranian Chemical Society","volume":null,"pages":null},"PeriodicalIF":2.2000,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Iranian Chemical Society","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s13738-024-03039-1","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
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.
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.