Tetracationic cyclo-tetraphosphane [(LC)4P4]4+ as triflate salt (LC = 4,5-dimethyl-1,3-diisopropyl-imidazol-2-yl) is obtained from the reduction of [LCPCl2]+ with 1,4-bis(trimethylsilyl)-1,4-dihydropyrazine and represents the first salt of the cationic cyclo-phosphane series with the general formula [LnPn]n+.
Photoredox catalysis is a powerful and modern strategy for the synthesis of complex organic molecules. So far, this field has relied on the use on a limited range of metal-based...
Effective methods for rare earth separation remain an important challenge that could benefit from new approaches. In this study, we demonstrate that for La/Ce separation, an in situ electrochemical Redox process in combination with Extraction and Stripping would provide very efficient separation of these elements in a single extraction step (CeRES). By combining in situ electrochemical oxidation and simultaneous solvent extraction with a stripping process involving electrochemical reduction, separation of Ce 3+ from La 3+ is achieved. Here, Ce 3+ is electrochemically oxidized to Ce 4+ and removed from the aqueous phase by solvent extraction with 100 mM D2EHPA in n-octane. To recover Ce 4+ from the loaded organic phase, in situ electrochemical reduction of Ce 4+ to Ce 3+ is employed. Thus, extraction and stripping by the redox state change triggered only by electrochemistry are achieved for the first time by using a shared organic phase. The approach was verified in a rapid prototype cell using the additive manufacturing technique, which enables a high Ce extraction of 85% and its recovery with nearly 100% purity in a single extraction step without the use of additional reagents.
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