voltammetry. X-ray structure determinations showed that in both NiFe complexes the nickel(II) center is in a square-planar S2Se2 environment; the two selenolate donors are bridging to the iron(II) center that is further coordinated to an η5-cyclopentadienyl group and a carbon monoxide ligand. Electrochemical studies showed that the complex [Ni(pbSmSe)FeCpCO]PF6 is an electrocatalyst for the production of
合成了两个新的异双核
镍铁配合物[Ni(pbSmSe)FeCpCO] PF 6和[Ni(xbSmSe)FeCpCO] PF 6作为[NiFeSe]氢化酶活性位点的模拟物(HCp =
环戊二烯; H 2 pbSmSe = 1,9 -二
甲苯基-3,7-二
硫代-2,2,8,8-四甲基
壬烷; H 2 xbSmSe = 1,2,-双(2-
硫代丁基-3,3-二甲基-4-
硒醇)苯)。通过单晶X射线衍射和循环伏安法对化合物进行表征。X射线结构测定表明,在两种NiFe配合物中,
镍(II)中心均处于正方形S 2 Se 2环境中。两个
硒酸酯供体连接到
铁(II)中心,该中心进一步与η相协调5-
环戊二烯基和
一氧化碳配体。电
化学研究表明,配合物[Ni(pbSmSe)FeCpCO] PF 6是在
DMF中,在
乙酸存在下于-2.1 V相对于Fc + / Fc的条件下,在
DMF中生成H 2的电催化剂。催化电流的波峰(FOWA)分析得出的估计值为24