Titanium and Niobium Complexes Stabilized by Tris(aminopyridinato) Ligands: Evidence of Variable Denticity in Trianionic Polydentate Ligands
作者:Gerhard Hillebrand、Anke Spannenberg、Perdita Arndt、Rhett Kempe
DOI:10.1021/om9704612
日期:1997.12.1
elimination to give (trisAP-4)TiCl (2), a mononuclear titanium complex that is coordinated by six nitrogen atoms according to an X-ray analysis. The reaction of NbCl3(DME)(η2-PhC⋮CSiMe3) with trilithiated 1b (in situ) formed (trisAP-4,6)Nb(η2-PhC⋮CSiMe3) (3). The tris(aminopyridinato) ligand trisAP-4,6 in 3 acts as a pentadentate ligand, in contrast to the hexadentate coordination of trisAP-4 in 2 and
在3当量三乙胺存在下,3当量的4-甲基-2-氨基吡啶和4,6-二甲基-2-氨基吡啶与三(溴二甲基甲硅烷基)甲烷反应,分别得到两种三(氨基吡啶)物质HC(SiMe 2 NHC 5 NH 3 -4-Me)的3 - ((trisAP-4)H 3,图1A)和HC(森达2 NHC 5 NH 2 -4,6--ME 2)3((trisAP -4,6-)H 3,1b)。化合物1a通过胺消除与(Me 2 N)3 TiCl反应生成(trisAP-4)TiCl(2),这是一种单核钛配合物,根据X射线分析,该配合物由六个氮原子配位。NbCl的反应3(DME)(η 2 -PhC⋮CSiMe 3)与trilithiated 1B(原位形成)(trisAP-4,6)的Nb(η 2 -PhC⋮CSiMe 3)(3)。三(aminopyridinato)配体在trisAP -4,6- 3只充当五齿配位体,在对比trisAP