The synthesis, structure, and reactivity of a base-free terminal actinide phosphinidene metallocene have been comprehensively studied. The salt metathesis reaction of the thorium methyl iodide complex Cp‴2Th(I)Me (2; Cp‴ = η5-1,2,4-(Me3C)3C5H2) with Mes*PHK (Mes* = 2,4,6-(Me3C)3C6H2) in THF furnishes the first stable base-free terminal phosphinidene actinide metallocene, Cp‴2Th═PMes* (3). Density functional theory (DFT) shows that the bonds between the Cp‴2Th2+ and [PMes*]2- fragments are more covalent than those in the related thorium imido complex. While the phosphinidene complex 3 shows no reactivity toward alkynes, it reacts with a variety of heterounsaturated molecules such as CS2, isothiocyanate, nitriles, isonitriles, and organic azides, forming carbodithioates, imido complexes, metallaaziridines, and azido compounds. These experimental observations are complemented by DFT computations.

中文翻译：

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无碱末端锕系膦亚茂金属茂：合成、结构、反应性和计算研究

已经全面研究了无碱末端锕系膦亚茂金属茂的合成、结构和反应性。甲基碘化钍配合物 Cp‴2Th(I)Me (2; Cp‴ = η5-1,2,4-(Me3C)3C5H2) 与 Mes*PHK (Mes* = 2,4,6-) 的盐复分解反应(Me3C)3C6H2) 在 THF 中提供了第一个稳定的无碱末端膦亚锕系茂金属，Cp‴2Th=PMes* (3)。密度泛函理论 (DFT) 表明，Cp‴2Th2+ 和 [PMes*]2- 片段之间的键比相关的亚钍复合物中的键更共价。虽然膦化物配合物 3 对炔烃没有反应性，但它​​与各种杂不饱和分子如 CS2、异硫氰酸酯、腈、异腈和有机叠氮化物反应，形成二硫代碳化物、酰亚胺配合物、金属氮丙啶和叠氮化合物。