The synthesis, characterization, and electrochemical studies of the dinuclear complex [(MeOH)Fe(Hbbpya)-μ-O-(Hbbpya)Fe(MeOH)](OTf)4 (1) (with Hbbpya = N,N-bis(2,2'-bipyrid-6-yl)amine) are described. With the help of online electrochemical mass spectrometry, the complex is demonstrated to be active as a water oxidation catalyst. Comparing the results obtained for different electrode materials shows a clear substrate influence of the electrode, as the complex shows a significantly lower catalytic overpotential on graphitic working electrodes in comparison to other electrode materials. Cyclic voltammetry experiments provide evidence that the structure of complex 1 undergoes reversible changes under high-potential conditions, regenerating the original structure of complex 1 upon returning to lower potentials. Results from electrochemical quartz crystal microbalance experiments rule out that catalysis proceeds via deposition of catalytically active material on the electrode surface.

中文翻译：

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铁基水氧化催化剂的催化活性：石墨电极的底物效应。

双核络合物[（MeOH）Fe（Hbbpya）-μ-O-（Hbbpya）Fe（MeOH）]（OTf）4（1）的合成，表征和电化学研究（Hbbpya = N，N-bis（描述了2，2′-联吡啶-6-基）胺。借助于在线电化学质谱法，该络合物被证明具有水氧化催化剂的活性。比较对于不同电极材料获得的结果，显示了电极对基材的明显影响，因为与其他电极材料相比，该配合物在石墨工作电极上显示出明显更低的催化超电势。循环伏安法实验提供了证据，表明复合物1的结构在高电势条件下发生可逆变化，并在返回较低电势时再生了复合物1的原始结构。