A mononuclear Mn(II) complex [Mn(p-MOPhH2IDC)2(H2O)2]·2(DMF), was synthesized by the reaction of p-MOPhH3IDC (2-(4-methoxyphenyl)-1H-imidazole-4,5-dicarboxylic acid) and Mn(CH3COO)2·4H2O under solvothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR and UV–vis spectroscopy. The structure analysis revealed that the manganese(II) center has a six-coordinated octahedral coordination geometry. The performance of a Mn(II) complex-doped carbon paste electrode (Mn-CPE) in the electrocatalytic hydrogen evolution reaction (HER) was evaluated by linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) methods. The polarization curve shows that the η 10 298K (overpotential, 10 mA cm−2) of the Mn-CPE was positively shifted by 341 mV compared with the bare CPE (without complex). The Tafel slope of the Mn-CPE was 161 mV dec−1. These data indicate that the Mn-CPE was effective in the HER electrocatalytic reaction. For EIS experiments, the arc diameter of the high-frequency region of the Mn-CPE was much smaller than that of the bare CPE, which further indicates the effective catalytic capacity of the Mn(II) complex for hydrogen evolution. The information obtained from this study will help to expand the application of Mn(II) complexes in the field of electrochemistry.

中文翻译：

---

掺杂咪唑二羧酸锰 (II) 络合物的碳糊电极上的电催化析氢

单核 Mn(II) 络合物 [Mn(p-MOPhH2国际数据中心）2（H2哦）2]·2(DMF)，由以下反应合成p-MOPhH3IDC (2-(4-甲氧基苯基)-1H-咪唑-4,5-二甲酸)和Mn(CH3首席运营官）2·4小时2O 在溶剂热条件下通过单晶 X 射线衍射、元素分析、红外和紫外-可见光谱进行表征。结构分析表明锰(II)中心具有六配位八面体配位几何形状。通过线性扫描伏安法（LSV）和电化学阻抗谱（EIS）方法评估了Mn（II）络合物掺杂碳糊电极（Mn-CPE）在电催化析氢反应（HER）中的性能。极化曲线表明η 10 298K（过电势，10 mA cm−2与裸 CPE（无复合物）相比，Mn-CPE 的 Mn-CPE 正移了 341 mV。Mn-CPE 的塔菲尔斜率为 161 mV dec−1。这些数据表明 Mn-CPE 在 HER 电催化反应中是有效的。对于EIS实验，Mn-CPE高频区的圆弧直径远小于裸CPE，这进一步表明Mn(II)配合物对析氢的有效催化能力。本研究获得的信息将有助于扩大Mn(II)配合物在电化学领域的应用。