Thermolysis of [Ru3(CO)12] in ethanol yielded the decanuclear hydridoruthenium cluster dianion [Ru10H2(CO)25]2â1. When a mixture of methanol and water is employed as thermolysis solvent the undecaruthenium hydridoruthenium trianion [Ru11H(CO)27]3â2 is also formed. Crystal structure analysis of 1 as its [N(PPh3)2]+ salt and 2 as its [NEt3(CH2Ph)]+ salt showed their metal core structures to be related, 2 being a square-faced capped congener of 1. Cluster 2 was alternatively formed in near-quantitative yields when [Ru3(CO)12] was thermolysed in acetonitrile containing traces of water for several days. It was not possible to locate the hydride ligands in the structures by potential-energy-minimisation calculations, but strong signals were seen in the 1H NMR spectra at δâ14.2 (s, 2 H) for 1 and at â5.47 (s, 1 H) for 2. On treatment of 1 and 2 with [Au(PPh3)Cl] in the presence of TlPF6, 1 showed no reactivity, but 2 reacted smoothly adding one [Au(PPh3)]+ moiety and giving a product characterised as [Ru11H(CO)27Au(PPh3)}]2â3. The structural relationships between the known high-nuclearity ruthenium hydrido carbonyl clusters are discussed, and their implications for a possible cluster build-up sequence considered.
在
乙醇中对[Ru3(CO)12]进行热解,可得到十核钅容簇二离子[Ru10H2(CO)25]2â1。当使用
甲醇和
水的混合物作为热解溶剂时,还生成了十一核
水合
钌三元离子[Ru11H(CO)27]3â2。对 1 的[N(PPh3)2]+盐和 2 的[NEt3(CH2Ph)]+盐的晶体结构分析表明,它们的
金属核结构是相关的,2 是 1 的方形封端同系物。当[Ru3(CO)12]在含有微量
水的
乙腈中热解数天后,簇 2 以接近定量的产率形成。虽然无法通过势能最小化计算确定结构中
氢化物配体的位置,但在 1H NMR 光谱中,1 和 2 分别在δâ14.2 (s, 2 H) 和â5.47 (s, 1 H) 处出现了强烈的信号。在 TlPF6 的存在下,用 [Au(PPh3)Cl]处理 1 和 2 时,1 没有显示出反应性,但 2 顺利地加入了一个 [Au(PPh3)]+ 分子,并得到了表征为 [Ru11H(CO)27Au(PPh3)}]2â3 的产物。本文讨论了已知高核度
钌水合羰基簇之间的结构关系,并考虑了它们对可能的簇构建序列的影响。