烷基紫精化合物的电氧化还原行为

Electroredox Behaviour of Alkyl Viologen Compounds

用微分脉冲极谱法研究了烷基紫精及聚紫精的电氧化还原行为。紫精的烷基影响紫精化合物的还原电位及其还原产物在电极上的成膜性能。与低分子烷基紫精相比，烷基聚紫精的第一还原电位Ｅ＿１较正，两步还原反应的电位间隔△Ｅ较大，而且两步还原反应均有良好的可逆性。支持电解质的卤素负离子对紫精化合物的还原电位有影响，其影响能力的顺序为：Ｉ￣－＞Ｂｒ￣－＞Ｃｌ￣－＞Ｆ￣－。

Electroredox behaviour of alkyl viologens and polyviologens has been investigated by using differential pulse polarography.The alkyl groups of viologen compounds influence the reduction potentials and the film forming property of reduced products on the electrode.Compared with the low molecular alkyl viologen compounds, the first reduction potentials (E1) of alkyl polyviologens are rather positive, the potential differences(△E)of two-step reduction potentials are larger. The halogen anions of supporting electrolytes influence the reduction potentials of viologen compounds, the order is I￣->Br￣->Cl￣->F￣-.