distance of 261(1) pm. The most remarkable feature is a N(Mg,Al,Si)N trigonal bipyramid, which originates from intramolecular two-centre and donor-acceptor bonds (AlN 187.7(6) and 188.6(6) pm, SiN 180.6(5), and 181.0(6) pm). The three neighbouring elements of the periodic table Mg, Al, and Si are thus bonded to a common nitrogen atom, which has a t-butyl group as an additional ligand. Derivatives of X have
路易斯酸性元素Li,Na,Mg和Al已成功地掺入以Me 2 Si(N t Bu)2单元为常见分子片段的环状结构中。[Me 2 Si(N t Bu)2 Mg·THF] 2(II)和[Me 2 Si(N(t Bu)AlMe 2)(N(t Bu)MgI)] 2( X)显示该化合物为二聚体。在II的情况下,两个四元SiN 2 Mg循环通过NMg键相互作用,形成点对称为C i的第三个N 2 Mg 2循环()。
镁原子通过
四氢呋喃配位与四个不同的MgN键(199.3(4),211.2(4)和218.8(4)pm)配位和一个MgO键(204.9(6)pm)配位。 。在X中,二聚体由IMg相互作用产生,再次形成向心对称的Mg 2 I 2。长方形。
镁原子进一步由两个氮原子配位,两个MgN键长分别为225.9(6)和229.9(6)pm,甲基位于261(1)pm处。最显着的特征是N(Mg,Al,Si)