Niobium complexes with terdentate diphosphino- and diamino-amido ligands. Crystal sturcture of [{NbCl<sub>3</sub>[N(CH<sub>2</sub>CH<sub>2</sub>PMe<sub>2</sub>)<sub>2</sub>]}<sub>2</sub>]·C<sub>6</sub>H<sub>5</sub>Me
作者:Abdul-R. H. Al-Soudani、Peter G. Edwards、Michael B. Hursthouse、K. M. Abdul Malik
DOI:10.1039/dt9950000355
日期:——
obtained, [NbCl3N(CH2CH2PPri2)2}] and [NbCl2N(CH2CH2PPri2)2}2]. However with the less sterically encumbered dimethylphosphino function only the diamagnetic dinuclear complex, [NbCl3[N(CH2CH2PMe2)2]}2], can be isolated; its stucture shows equivalent bridging terdentate amide ligands with two bridging chlorides for each dimeric unit resulting in eight-co-ordinate niobium atoms. In contrast, the bis(
[NbCl 4(thf)2 ](thf =四氢呋喃)与双(叔膦基乙基)酰胺Li- [N(CH 2 CH 2 PR 2)2 ](R = Me或Pr i)的反应导致形成新的铌二烷基酰胺。产生的特定络合物取决于反应的化学计量和叔膦取代基的大部分。因此,具有庞大的二异丙基膦基官能团,获得了单体顺磁性单配体和双配体配合物,[NbCl 3 N(CH 2 CH 2 PPr i 2)2 }]和[NbCl 2 N(CH 2CH 2 PPr i 2)2 } 2 ]。然而,具有较少空间阻碍的二甲基膦基官能团,只能分离出反磁性双核配合物[NbCl 3 [N(CH 2 CH 2 PMe 2)2 ]} 2 ]。它的结构显示了等效的桥联叔齿酰胺配体,每个二聚体单元带有两个桥联氯化物,产生了八个坐标的铌原子。相反,双(2-二乙基氨基乙基)酰胺Li [N(CH 2 CH 2 NEt 2)2较小的膦的类似物[1],仅再次产生顺磁性单体衍生物。