以电化学及现场紫外可见近红外及现场红外光谱电化学方法对Dawson结构多阴离子簇As2 Mo18O6 -6 2在高氯酸酸化的乙腈溶液中的电还原过程进行了研究 ,结果表明 ,该多阴离子在质子介质中经历四步可逆的两电子还原反应 ,多阴离子簇的还原伴随着产物的质子化 ,质子化的位置在Mo—O—Mo桥键的桥氧上 ,由于质子化诱导极化作用使Mo =O双键还原后吸收峰蓝移且增强 Electrochemical and field UV-visible near-infrared spectroscopy and field infrared spectroscopy electrochemical method Dawson polyanionic cluster As2 Mo18O6 -6 2 in the acidification of acidified acetonitrile solution was studied, the results show that the polyanion In the proton medium undergoes four-step reversible two-electron reduction reaction, reduction of polyanionic clusters is accompanied by protonation of the product, protonation is located on the bridge of Mo-O-Mo bridging oxygen due to protonation induced polarization After the Mo = O double bond reduction absorption peak blue shift and enhanced