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Uranium(iv) cyclobutadienyl sandwich compounds: synthesis, structure and chemical bonding.
Chemical Communications ( IF 4.3 ) Pub Date : 2019-12-19 , DOI: 10.1039/c9cc09018e
Nikolaos Tsoureas 1 , Akseli Mansikkamäki 2 , Richard A Layfield 1
Affiliation  

The 1 : 1 reactions of uranium(iv) tetrakis(borohydride) with the sodium and potassium salts of the cyclobutadienyl anion [C4(SiMe3)4]2- (Cb'''') produce the half-sandwich complexes [Na(12-crown-4)2][U(η4-Cb'''')(BH4)3] and [U(η4-Cb'''')(μ-BH4)3{K(THF)2}]2. In the 1 : 2 reaction of U(BH4)4 with Na2Cb'''', formation of [U(η4-Cb'''')(η3-C4H(SiMe3)3-κ-(CH2SiMe2)(BH4))]- reveals that a Cb'''' ligand undergoes an intramolecular deprotonation, resulting in an allyl/tuck-in bonding mode. A computational study reveals that the uranium-Cb'''' bonding has an appreciable covalent component with contributions from the uranium 5f and 6d orbitals.

中文翻译:

铀(iv)环丁二烯基夹心化合物:合成,结构和化学键合。

铀(iv)四(硼氢化物)与环丁二烯基阴离子[C4(SiMe3)4] 2-(Cb'''')的钠盐和钾盐的1:1反应产生半夹心络合物[Na(12 -crown-4)2] [U(η4-Cb'''')(BH4)3]和[U(η4-Cb'''')(μ-BH4)3 {K(THF)2}] 2 。在U(BH4)4与Na2Cb''''的1:1反应中,形成[U(η4-Cb'''')(η3-C4H(SiMe3)3-κ-(CH2SiMe2)(BH4)) ]-表明Cb-/-配体经历了分子内的去质子化,导致了烯丙基/折入键的模式。一项计算研究表明,铀-Cb键具有明显的共价成分,而铀5f和6d轨道的贡献很大。
更新日期:2019-12-19
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