Synthesis of a Nitrido-Substituted Analogue of the Uranyl Ion, [N=U=O]+

Synthesis of a Nitrido-Substituted Analogue of the Uranyl Ion, [N=U=O]+
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DOI:
10.1021/ja101567h
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发表时间:
2010-05-26
影响因子:
15
通讯作者:
Hayton, Trevor W.
Hayton, Trevor W.
中科院分区:
化学1区
文献类型:
--
作者:
Fortier, Skye;Wu, Guang;Hayton, Trevor W.

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向U[NR 2](3)(R = SiMe 3)中加入0.5当量的NaN 3,得到金属配体[Na(DME)(2)(TMEDA)][(NR 2)(2)U(μ-N)(CH 2SiMe 2NR)U(NR 2)(2)](1),产率为69%。络合物1容易被0.5当量的I-2氧化,生成混合价U(IV/V)氮基络合物(NR 2)(2)U(μ-N)(CH 2SiMe 2NR)U(NR 2)(2)(2)。或者,用1当量的Me 3 NO氧化1,以良好的产率得到氧代-腈基络合物[Na(DME)(2)][(NR 2)(2)(O)U(μ-N)(CH 2SiMe 2NR)U(NR 2)(2)](3)。用X射线晶体学测定了1-3的固态分子结构。这些配合物的一个显著特征是不等价的U=N-U键相互作用。此外,3含有一个反式氧氮[O=U=N](+)部分,其测量参数接近铀酰阳离子UO 22+。用SQUID磁强计研究了化合物1-3的磁性。
Addition of 0.5 equiv of NaN3 to U[NR2](3) (R = SiMe3) affords the metallacycle [Na(DME)(2)(TMEDA)][(NR2)(2)U(mu-N)(CH2SiMe2NR)U(NR2)(2)] (1) in 69% yield. Complex 1 is readily oxidized by 0.5 equiv of I-2, generating the mixed valent U(IV/V) nitrido complex (NR2)(2)U(mu-N)(CH2SiMe2NR)U(NR2)(2) (2). Alternatively, oxidation of 1 with 1 equiv of Me3NO affords the oxo-nitrido complex [Na(DME)(2)][(NR2)(2)(O)U(mu-N)(CH2SiMe2NR)U(NR2)(2)] (3) in good yield. The solid-state molecular structures of 1-3 have been determined by X-ray crystallography. A notable feature of these complexes are the inequivalent U=N-U bonding interactions. Moreover, 3 contains a trans oxo-nitrido [O=U=N](+) moiety with metrical parameters approximating those of the uranyl cation, UO22+. The magnetic properties of 1-3 were investigated by SQUID magnetometry.