Uranium versus Thorium: Synthesis and Reactivity of [
<i>η</i>
<sup>5</sup>
‐1,2,4‐(Me
<sub>3</sub>
C)
<sub>3</sub>
C
<sub>5</sub>
H
<sub>2</sub>
]
<sub>2</sub>
U[
<i>η</i>
<sup>2</sup>
‐C
<sub>2</sub>
Ph
<sub>2</sub>
]
作者:Deqiang Wang、Wanjian Ding、Guohua Hou、Guofu Zi、Marc D. Walter
DOI:10.1002/chem.202100089
日期:2021.4.16
The synthesis, electronic structure, and reactivity of a uranium metallacyclopropene were comprehensively studied. Addition of diphenylacetylene (PhC≡CPh) to the uranium phosphinidene metallocene [η5‐1,2,4‐(Me3C)3C5H2]2U=P‐2,4,6‐tBu3C6H2 (1) yields the stable uranium metallacyclopropene, [η5‐1,2,4‐(Me3C)3C5H2]2U[η2‐C2Ph2] (2). Based on density functional theory (DFT) results the 5f orbital contributions
对铀金属环丙烯的合成、电子结构和反应活性进行了全面研究。将二苯乙炔 (PhC≡CPh) 加成到铀次膦茂金属 [ η 5 ‐1,2,4-(Me 3 C) 3 C 5 H 2 ] 2 U=P-2,4,6- t Bu 3 C 6 H 2 ( 1 ) 产生稳定的铀金属环丙烯,[ η 5 ‐1,2,4-(Me 3 C) 3 C 5 H 2 ] 2 U[ η 2 ‐C 2 Ph 2 ] ( 2 )。根据密度泛函理论 (DFT),与相关的 Th IV化合物相比,5f 轨道对金属环丙烯 U-( η 2 -C=C) 部分内成键的贡献显着增加 [ η 5 -1,2,4-( Me 3 C) 3 C 5 H 2 ] 2 Th[ η 2 ‐C 2 Ph 2 ],这也会导致 [ η 5 ‐1,2,4-(Me 3 C) 3 C 5 H 之间产生更多共价键2 ] 2 U 2+和 [ η 2 ‐C 2 Ph 2 ] 2−片