The crystalline trinuclear cerium cluster complex [(Ce(OBut)2}2(μ-OBut)3(μ3-OBut)2Ce(OBut)(NO3)}] 1 has been obtained in good yield from 2â[Ce(OBut)4(thf)2], [Ce(OBut)3(NO3)] and Sn(C5H3But2-1,3)Me3 by refluxing in hexane, and was characterised by microanalysis, 1H NMR, IR and UVâVis spectra and MS data. Its structure and bonding have been analysed by X-ray diffraction. Density functional calculations were carried out on the model compound 2, in which each OBut substituent was replaced by OH, and 3, related to 2 but with
OH instead of NO3. The geometric parameters showed good agreement with experiment. It is concluded that 1 is a mixed valence Ce(III)[Ce(IV)]2 cluster, that the single f electron is localised on the NO3-bearing Ce atom, and that excitation of this electron to a low energy alternative state is facile. Hence the cluster may offer potential as an f-electron molecular switch.
由 2â[Ce(OBut)4(thf)2] 和 [Ce(OBut)3(
NO3)] 以及 Sn(C5H3But2-1,3)Me3 在己烷中回流得到了晶体状三核
铈簇合物 [(Ce(OBut)2}2(δ-OBut)3(δ3-OBut)2Ce(OBut)( )}] 1、[通过微量分析、1H NMR、IR 和 UV-Vis 光谱以及 MS 数据对其进行了表征。通过 X 射线衍射分析了其结构和成键情况。对模型化合物 2 和 3 进行了密度泛函计算,前者中的每个 OBut 取代基都被 OH 取代,后者与 2 有关,但 OH 取代了 。几何参数与实验结果吻合。结论是 1 是一个混合价的 Ce(III)[Ce(IV)]2 簇,单 f 电子位于含 的 Ce 原子上,该电子容易激发到低能替代态。因此,该团簇具有作为 f 电子分子开关的潜力。