Abstract The three-phase electrochemistry of 2,2-diphenyl-1-picrylhydrazyl (DPPH) has been studied by attaching a droplet of nitrobenzene (NB) containing DPPH to a graphite electrode in an aqueous electrolyte solution. Since DPPH can be reduced to DPPH− and oxidized to DPPH+, the accompanying ion transfer to NB and ion pair formation in NB are accessible. The anion transfer from water to nitrobenzene is accompanied by the formation of ion pairs [DPPH+An−] with nitrate, hexafluorophosphate, perchlorate and trichloroacetate. The ion pair formation of DPPH− with tetrabutylammonium cations is very weak. When the DPPH is dissolved in molten paraffin together with the salt tetrabutylammonium tetrafluoroborate (TBATFB), and composite electrodes are produced by mixing the paraffin with graphite powder, DPPH exhibits a typically surface electrochemical response providing a rather stable system DPPH/DPPH−.

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DPPH 在用于离子转移和离子缔合研究的三相电极系统中的电化学

摘要 通过将含有 DPPH 的硝基苯 (NB) 液滴附着在电解质水溶液中的石墨电极上，研究了 2,2-二苯基-1-苦基肼 (DPPH) 的三相电化学。由于 DPPH 可以被还原为 DPPH− 并被氧化为 DPPH+，因此可以实现伴随离子转移到 NB 和 NB 中的离子对形成。阴离子从水转移到硝基苯伴随着与硝酸盐、六氟磷酸盐、高氯酸盐和三氯乙酸盐形成离子对 [DPPH+An−]。DPPH− 与四丁基铵阳离子的离子对形成非常弱。当DPPH与四氟硼酸四丁基铵（TBATFB）一起溶解在熔融石蜡中，石蜡与石墨粉混合制成复合电极时，