A series of niobium and tantalum imido complexes with mono-anionic ortho-metallated acetophenone imine ligands have been prepared and characterized using NMR spectroscopy, mass spectrometry and elemental analysis. These low symmetry complexes are produced with only one or two structural isomers in all cases and display interesting correlations between the steric bulk of the ligands employed and the isomers formed. Crystal structures of several new niobium and tantalum complexes are presented as confirmation of the connectivity in these structural isomers.
我们利用核磁共振光谱法、质谱法和元素分析法制备了一系列具有单阴离子正交
金属化
苯乙酮亚胺配体的
铌和
钽亚胺配合物,并对其进行了表征。这些低对称性配合物在所有情况下都只有一种或两种结构异构体,并显示出
配体的立体结构与所形成的异构体之间有趣的相关性。本文还展示了几种新的
铌和
钽配合物的晶体结构,以证实这些结构异构体之间的关联性。