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C–H Bond Activation via U(II) in the Reduction of Heteroleptic Bis(trimethylsilyl)amide U(III) Complexes
Organometallics ( IF 2.5 ) Pub Date : 2020-09-16 , DOI: 10.1021/acs.organomet.0c00496
Justin C. Wedal 1 , Samuel Bekoe 1 , Joseph W. Ziller 1 , Filipp Furche 1 , William J. Evans 1
Affiliation  

Reduction of (C5Me5)2UIII(NR2) and (C5Me5)UIII(NR2)2 (R = SiMe3) with potassium graphite in the presence of 2.2.2-cryptand (crypt) generates dark solutions that have UV–visible spectra consistent with time-dependent density functional theory (TDDFT) calculations on the U(II) products, [(C5Me5)2UII(NR2)] and [(C5Me5)UII(NR2)2]. However, the solutions quickly change color and form the U(III) C–H bond activation products [K(crypt)][(C5Me5)2UIII(CH2SiMe2NSiMe3CN)] (1) and [K(crypt)][(C5Me5)UIII(NR2)(CH2SiMe2NSiMe3-κCN)] (2), which were identified by X-ray crystallography. DFT calculations on the putative [(C5Me5)2UII(NR2)] and [(C5Me5)UII(NR2)2] complexes revealed 5f36d1 ground-state electron configurations, as previously found in isolable [(C5H4SiMe3)3UII], which indicated that these low-symmetry heteroleptic complexes are reasonable precursors for new U(II) complexes.

中文翻译:

通过U(II)活化杂合双(三甲基甲硅烷基)酰胺U(III)配合物中的CH键

在2.2.2-cryptand(crypt)的存在下用石墨酸钾还原(C 5 Me 52 U III(NR 2)和(C 5 Me 5)U III(NR 22(R = SiMe 3)在U(II)产物[(C 5 Me 52 U II(NR 2)] -和[(C 5)上生成具有紫外可见光谱的深色溶液,该光谱与时变密度泛函理论(TDDFT)计算一致Me 5)U II(NR22 ] -。然而,这些解决方案迅速地改变颜色和形成U(III)CH键活化产物[K(隐窝)] [(C 552 ù III(CH 2森达2 NSiMe 3Ç,κ Ñ) ](1)和[K(隐窝)] [(C 55)U III(NR 2)(CH 2森达2 NSiMe 3 - κC,κ ñ)](2),通过X射线晶体学鉴定。对推定的[(C 5 Me 52 U II(NR 2)] -和[(C 5 Me 5)U II(NR 22 ] -络合物的DFT计算显示了5f 3 6d 1基态电子构型,如先前在可分离的[(C 5 H 4 SiMe 33 U II ]中所发现的-,表明这些低对称性的杂配物是新的U(II)配合物的合理前体。
更新日期:2020-09-28
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