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Sun, Chencheng; Mirzadeh, Nedaossadat; Guo, Si-Xuan; Li, Jiezhen; Li, Zhengkui; Bond, Alan M; Zhang, Jie; Bhargava, Suresh K
Inorganic chemistry, 10/2019, Letnik: 58, Številka: 20Journal Article
The rational design of binuclear Au(I)–Au(I), Au(II)–Au(II), and Au(I)–Au(III) complexes requires an understanding of how the redox states interconvert. Herein, the electrochemical interconversion of the three oxidation states I, II, and III is reported on the voltammetric (cyclic and rotating disk electrode) time scales for binuclear gold complexes containing C6F4PPh2 as a ligand, to demonstrate for the first time formation of a binuclear Au(II)–Au(II) from a Au(I)–Au(III) complex. Results are supported by bulk electrolysis and coulometry with reaction products being identified by 31P NMR and UV–vis spectroscopy. All electrochemical processes involve an overall two-electron charge-transfer process with no one-electron intermediate being detected. Importantly, the kinetically rather than thermodynamically favored isomer Au2 IIX2(μ-2-C6F4PPh2)2 is formed on redox cycling of XAuI(μ-2-C6F4PPh2)(κ2-2-C6F4PPh2)AuIIIX (X = Cl, ONO2). Finally, a mechanism is proposed to explain the simultaneous change of coordination of the chelating carbanionic ligand to bridging mode and interconversion of oxidation states in binuclear gold complexes.
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