4 research outputs found

    Thermally stable uranium dinitrogen complex with siloxide supporting ligands

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    A new dinitrogen adduct of a homoleptic uranium tris(siloxide) complex, [U{OSi(Mes)3}3]2(μ-η2:η2-N2), is reported. Synthesis of the 15N-labeled isotopomer and Raman spectroscopy confirm the reductive activation of N2 to a (N2)2– dianion. The 15N NMR shift of the 15N2-labeled isotopomer is also reported. Crystallographic characterization shows a side-on (N2)2– coordinated in either an eclipsed or staggered conformation in different crystals. The U–N2–U complex is stable to vacuum and shows high thermal stability, retaining the formally reduced dinitrogen at 100 °C. The parent three-coordinate uranium(III) [U{OSi(Mes)3}3] could not be isolated in our hands, with N2-free syntheses affording only uranium(IV) compounds. The rational synthesis and full characterization of two such U(IV) byproducts, [U{OSi(Mes)3}{N(SiMe3)2}3] and [U{OSi(Mes)3}4], is also reported

    Thermally Stable Uranium Dinitrogen Complex with Siloxide Supporting Ligands

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    A new dinitrogen adduct of a homoleptic uranium tris­(siloxide) complex, [U­{OSi­(Mes)<sub>3</sub>}<sub>3</sub>]<sub>2</sub>(μ-η<sup>2</sup>:η<sup>2</sup>-N<sub>2</sub>), is reported. Synthesis of the <sup>15</sup>N-labeled isotopomer and Raman spectroscopy confirm the reductive activation of N<sub>2</sub> to a (N<sub>2</sub>)<sup>2–</sup> dianion. The <sup>15</sup>N NMR shift of the <sup>15</sup>N<sub>2</sub>-labeled isotopomer is also reported. Crystallographic characterization shows a side-on (N<sub>2</sub>)<sup>2–</sup> coordinated in either an eclipsed or staggered conformation in different crystals. The U–N<sub>2</sub>–U complex is stable to vacuum and shows high thermal stability, retaining the formally reduced dinitrogen at 100 °C. The parent three-coordinate uranium­(III) [U­{OSi­(Mes)<sub>3</sub>}<sub>3</sub>] could not be isolated in our hands, with N<sub>2</sub>-free syntheses affording only uranium­(IV) compounds. The rational synthesis and full characterization of two such U­(IV) byproducts, [U­{OSi­(Mes)<sub>3</sub>}­{N­(SiMe<sub>3</sub>)<sub>2</sub>}<sub>3</sub>] and [U­{OSi­(Mes)<sub>3</sub>}<sub>4</sub>], is also reported

    The sampling precision of research in five major areas of psychology

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