Reduction of [U(NN′3)I] [NN′3
= N(CH2CH2NSiMe2But)3] with potassium in pentane gives the purple trivalent monomer [U(NN′3)] in good yield, this compound having previously been synthesised via fractional vacuum sublimation of mixed-valent [U(NN′3)}2(μ-Cl)]. The magnetic susceptibility of this compound is consistent with the presence of U(III) centres, and this is confirmed by a characteristic near IR spectrum. Its reactions with Lewis bases to give e.g. [U(NN′3)(Py)] and [U(NN′3)(HMPA)] are reported, along with the molecular structure of the latter. The complex [U(NN′3)] is readily oxidised, imido and hydrazido complexes being formed readily by reaction with trimethylsilyl-azide and -diazomethane, respectively. The reaction with methylene trimethylphosproane
however led to the formation of an addition compound [U(NN′3)(CH2PMe3)]. Reaction of this latter complex with air gave a few crystals of the unusual hydroxo complex [U(NN′3)(OH)(CH2PMe3)] which was structurally characterised. Reaction of [U(NN′3)(CH2PMe3)] with trimethylamine N-oxide gave pentavalent [U(NN′3)(O)], or perhaps a dimer thereof. The latter complex reacted with [U(NN′3)] to give the bridging oxo complex [U(NN′3)}2(μ-O)] which could also be prepared directly by reaction of trimethylamine N-oxide with [U(NN′3)].
在
戊烷中用
钾还原 [U(NN′3)I] [NN′3 = N( NSiMe2But)3] 得到紫色三价单体 [U(NN′3)],收率很高,这种化合物之前是通过混合价 [U(NN′3)}2(μ-Cl)] 的分馏真空升华合成的。这种化合物的磁感应强度与 U(III)中心的存在相吻合,其特征性的近红外光谱也证实了这一点。报告还介绍了它与路易斯碱反应生成[U(NN′3)(Py)]和[U(NN′3)(HMPA)]的情况,以及后者的分子结构。复合物[U(NN′3)]很容易氧化,分别与三甲基
硅叠氮化物和二氮
甲烷反应很容易形成亚
氨基和酰
肼络合物。然而,与亚甲基三甲基
磷丙烷反应会生成加成化合物[U(NN′3)(
CH2PMe3)]。后一种复合物与空气反应后,产生了一些不常见的羟基复合物[U(NN′3)(OH)( PMe3)]晶体,并确定了其结构特征。U(NN′3)( PMe3)]与
三甲胺 N-氧化物反应产生了五价[U(NN′3)(O)],或许是其二聚体。后者与[U(NN′3)]反应生成桥接氧配合物[U(NN′3)}2(μ-O)],该配合物也可以通过
三甲胺 N-氧化物与[U(NN′3)]反应直接制备。