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CO2 Activation with Formation of Uranium Carbonate Complexes in a Closed Synthetic Cycle
Organometallics ( IF 2.5 ) Pub Date : 2020-01-09 , DOI: 10.1021/acs.organomet.9b00786
Pablo Waldschmidt 1 , Christopher J. Hoerger 1 , Judith Riedhammer 1 , Frank W. Heinemann 1 , Christina T. Hauser 1 , Karsten Meyer 1
Affiliation  

A closed synthetic cycle for the transformation of carbon dioxide to carbonate with a mid-valent tris(aryloxide)-ligated uranium(IV) terminal oxo complex is presented herein. Starting from the previously reported uranium(III) complex, [UIII(OArAd,Ad,Me)3], the uranium(V) terminal oxo complex, obtained by oxidation with N2O or NO, can be reduced with KC8 to yield CO2 activating anionic uranium(IV) oxo complexes [(Ad,Ad,MeArO)3UIV(O)]. The cycle proceeds with the formation of [(Ad,Ad,MeArO)22-Ad,Ad,MeArOCO2)UIV(μ-κ12-CO3)] upon reaction of the oxo anion with excess CO2 that adds to the terminal oxido ligand and inserts into the uranium–aryloxide bond. Treating this complex with trimethylsilyl halide eliminates both carbonates and generates, for instance, [K(2.2.2-crypt)][(Ad,Ad,MeArO)3UIV(I)2], which can ultimately be reduced with KC8 to recover the trivalent starting material, thus closing the cycle. In contrast, reaction of the 18-crown-6 stabilized U(IV) oxo analogue with CO2 yields a rare and isolable example of a uranium complex with a μ-κ12-CO3-bound carbonate weakly interacting with the [K(18-crown-6)(THF)]+ moiety; here, CO2 insertion and formation of an aryl carbonate ligand are not observed.

中文翻译:

在封闭的合成循环中激活CO 2活化并生成碳酸铀络合物

本文给出了用中等价的三(芳氧基)-连接的铀(IV)末端氧代配合物将二氧化碳转化为碳酸盐的封闭合成循环。从先前报道的铀(III)配合物[U III(OAr Ad,Ad,Me3 ]开始,可以用KC 8还原通过用N 2 O或NO氧化获得的铀(V)末端羰基配合物。生成CO 2活化阴离子铀(IV)氧配合物[(Ad,Ad,Me ArO)3 U IV(O)] -。与形成的循环进行[(广告,广告中,Me ARO)2(κ 2 -广告,广告中,Me ArOCO 2)U IV(μ-κ 1:κ 2 -CO 3)] -在与过量CO的含氧阴离子的反应2,增加了终端氧桥配体和插入到铀芳氧基键。用三甲基甲硅烷基卤处理该络合物消除了碳酸盐,并生成了例如[K(2.2.2-crypt)] [(Ad,Ad,Me ArO)3 U IV(I)2 ],最终可以用KC还原8回收三价原料,从而结束循环。相反,18冠6稳定的U(IV)氧代类似物与CO 2的反应产生复合物与μ-κ铀的一种罕见的和可分离的示例1:κ 2 -CO 3结合的碳酸盐弱与[K(18-冠-6)(THF)]相互作用+部分; 在此,未观察到CO 2的插入和碳酸芳基酯配体的形成。
更新日期:2020-01-09
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