Herein, we compare the electrochemical and electrocatalytic properties of two selected, water-insoluble Fe(II) coordination complexes made with the non-symmetric, bidentate ligands, 2-(2′-pyridyl)benzimidazole (PBI) in [Fe(PBI)₃](OTf)₂ (1, OTf⁻ = trifluoromethyl sulfonate anion) and 2-(2′-pyridyl)benzoxazole (PBO) in [Fe(PBO)₂(OTf)₂] (2) . Cyclic voltammetry in water/acetonitrile mixture indicates considerable activity for both compounds. However, only 1 acts as homogeneous catalyst. The complexes have been successfully immobilized on indium-tin-oxide (ITO) electrode surface. The hydrophobic ligands allowed for a simple dip-coating and drop-casting of 1 and 2 onto ITO. Both 1/ITO and 2/ITO showed increased activity in electrocatalytic O₂ evolution in borate buffer at pH 8.3. According to scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), moreover, re-dissolution tests, the Fe remains in complex with PBI during electrolysis in the drop-casted, nano-porous films of 1/ITO. In contrast, the PBO complex in 2/ITO undergoes a rapid in situ decomposition yielding a mineralized form that is responsible for catalysis.

在这里，我们比较了由两种不对称的双齿配体2-（2'-吡啶基）苯并咪唑（PBI）在[Fe（PBI）中制备的两种水不溶性Fe（II）配位配合物的电化学和电催化性能。₃ ]（OTF）₂（1，光学传递函数^- =三氟甲基磺酸根阴离子）和2-（2'-吡啶基）苯并恶唑（PBO）中的[Fe（PBO）₂（OTF）₂ ]（2）。水/乙腈混合物中的循环伏安法表明这两种化合物都有相当大的活​​性。但是，只有1充当均相催化剂。该配合物已成功地固定在氧化铟锡（ITO）电极表面上。疏水配体允许将1和2进行简单的浸涂和滴铸到ITO上。两个1 / ITO和2 / ITO显示出电ö增加的活性₂演化在硼酸盐缓冲液，pH 8.3。根据扫描电子显微镜（SEM），能量色散X射线能谱（EDX），X射线光电子能谱（XPS）以及再溶解试验，在滴铸过程中，电解过程中，Fe与PBI保持复合状态，1 / ITO的纳米多孔膜。相反，2 / ITO中的PBO络合物经历了快速的原位分解产生负责催化作用的矿化形式。