The reaction of the donor functionalised N,N-bis[2-(pyrid-2-yl)ethyl]hydroxylamine [HON(C2H4-o-py)2] and three equivalents of the Lewis-acids AlMe3, GaMe3 or InMe3 resulted in the formation of dimethylhydroxylaminato–metal complexes of the general constitution [MMe2ON(C2H4-o-py)2·2MMe3] with M = Al (1), Ga (2) or In (3) by methane elimination. An alternative method to generate complexes 1 and 2 is the transmetalation of [YCp2ON(C2H4-o-py)2] with an excess of AlMe3 or GaMe3, respectively. All compounds were characterised by elemental analysis, NMR spectroscopy and single-crystal X-ray diffraction. The complexes [GaMe2ON(C2H4-o-py)2·2GaMe3] (2) and [InMe2ON(C2H4-o-py)2·2InMe3] (3) show highly dynamic behaviour in solution with the two pyridine nitrogen atoms changing their coordination to the metal atoms rapidly at ambient temperature. VT 1H NMR experiments showed that this dynamic exchange can be frozen on the NMR time scale. In contrast to 2 and 3, complex 1 does not change its coordination mode at ambient temperature in non-coordinating solvents.
通过
甲烷消除,供体功能化的N,N-双[2-(
吡啶-2-基)乙基]
羟胺[HON(
C2H4-o-py)2]与三当量的Lewis酸AlMe3、GaMe3或InMe3反应,形成了具有一般结构[MMe2ON( -o-py)2·2MMe3]的二甲基羟
氨基合
金属配合物,其中M = Al (1)、Ga (2) 或 In (3)。生成配合物1和2的另一种方法是分别用过量的AlMe3或GaMe3进行[YCp2ON( -o-py)2]的
金属转移反应。所有化合物都通过元素分析、NMR光谱和单晶X射线衍射进行了表征。配合物[GaMe2ON( -o-py)2·2GaMe3] (2)和[InMe2ON( -o-py)2·2InMe3] (3)在溶液中显示出高度动态行为,两个
吡啶氮原子在室温下迅速改变与
金属原子的配位。变温1H NMR实验表明,这种动态交换可以在NMR时间尺度上冻结。与2和3不同,配合物1在非配位溶剂中室温下不会改变其配位模式。