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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Cs_3UP_2S_8, a coordination polymer containing the unprecedented [U=S]~(2+) sulfidouranium(2+) moiety
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Cs_3UP_2S_8, a coordination polymer containing the unprecedented [U=S]~(2+) sulfidouranium(2+) moiety

机译:Cs_3UP_2S_8,一种包含前所未有的[U = S]〜(2+)硫代铀(2+)部分的配位聚合物

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摘要

Although terminal chalcogeno ligands are well known for the group 5 and 6 transition metals, they are highly unusual for the oxophilic group 4 metals and unknown so far for the lanthanides or actinides. Cs_3UP _2S_8, is the first actinide compound containing a terminal M=S group. It was synthesized by reacting uranium metal, Cs_2S, S, and P_2S_5 in a 4:1:8:3 ratio at 700 °C in an eutectic LiCl/CsCl mixture. The crystal structure was determined by single-crystal X-ray diffraction techniques. Cs_3UP_2S_8 crystallizes in the rhombohedral space group R3 [a = 15.5217(8) ?; c = 35.132(2) ?, V = 8305.0(8) ?3, Z = 18]. The crystal structure is based on a tetrahedral network type, wherein the uranium atoms are coordinated by a unusual sulfido moiety and thiophosphate groups in a pseudo-tetrahedral fashion. The U=S distance of 2.635(3) ? observed in the sulfide moiety is approx. 0.2 ? shorter than the average U-S single bond length, indicating a double-bond type character.
机译:尽管末端硫族元素配体对于第5和6族过渡金属是众所周知的,但对于嗜氧4族金属却极为罕见,而对于镧系元素或act系元素则迄今未知。 Cs_3UP _2S_8是包含末端M = S基团的第一act系元素化合物。它是通过使铀金属,Cs_2S,S和P_2S_5以4:1:8:3的比例在700°C的低共熔LiCl / CsCl混合物中反应合成的。通过单晶X射线衍射技术确定晶体结构。 Cs_3UP_2S_8在菱面体空间群R3中结晶[a = 15.5217(8)?; c = 35.132(2)θ,V = 8305.0(8)θ3,Z = 18]。晶体结构基于四面体网络类型,其中铀原子以拟四面体方式由不寻常的硫基部分和硫代磷酸酯基团配位。 U = S距离2.635(3)?在硫化物中观察到的大约是0.2?短于平均U-S单键长度,表示双键型字符。

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