Electrosynthesis in room-temperature ionic liquids: benzaldehyde reduction
2004; Elsevier BV; Volume: 49; Issue: 22-23 Linguagem: Inglês
10.1016/j.electacta.2003.12.058
ISSN1873-3859
AutoresAndrew P. Doherty, Claudine A. Brooks,
Tópico(s)CO2 Reduction Techniques and Catalysts
ResumoThe electrochemical reduction of benzaldehyde at Pt microelectrodes in 1-butyl-1-methyl pyrrolidinium triflimide ([Bmpyr][NTF2]) room temperature ionic liquid is reported. At high potential sweep rates (>1000 V s−1) reduction occurs as two reversible one-electron reduction processes corresponding to the reversible formation of the radical anion (at −1.6 V versus Pt) and the dianion species (at −2.2 V versus Pt). The second order rate constant for radical anion–radical anion dimerisation was 1.4×104 mol−1 dm3 s−1, while the pseudo-first-order rate constant for the subsequent formation of the alcohol (or electroinactive alcoholate) was 1000 s−1. Kinetically, the electrochemistry is similar to that in acetonitrile or alkaline ethanol. At lower potential sweep rates, a third irreversible reduction occurs which appears to be the reduction of the pyrrolidinium cation as an ion-associated species with the anion products of the initial reductions.
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