coordinating in the equatorial plane. In the case of the smaller titanium metal center, only two pyridine solvent molecules coordinate to the metal atom, leaving an open coordination site. All three complexes react with halogen oxidants to afford oxidative addition products [N2O2ox]MCl2Ln (M = Ti, n = 0; M = Zr, Hf, L = thf, n = 1), in which the redox-active ligand is oxidized by two electrons to the cyclohexadienediimine
氧化还原活性
配体 N,N'-双(3,5-二叔丁基-2-苯氧基)-1,2-苯二酰胺 [N2O2red]4– 与 IV 族
金属盐反应形成六-和七-坐标复合物 [N2O2red]MLn(M = Ti,L = py,n = 2;M = Zr,Hf,L = thf,n = 3)。氧化还原活性
配体在这些复合物中占据四个赤道配位点。在
锆和
铪配合物的情况下,两个轴向溶剂分子与
金属中心配位,第三个溶剂分子在赤道平面上配位。在较小的
钛金属中心的情况下,只有两个
吡啶溶剂分子与
金属原子配位,留下一个开放的配位点。所有三种配合物都与卤素氧化剂反应生成氧化加成产物 [N2O2ox]MCl2Ln (M = Ti, n = 0; M = Zr, Hf, L = thf, n = 1),其中氧化还原活性
配体被两个电子氧化成环己二
亚胺状态。(© Wiley-
VCH Verlag GmbH & Co. KGaA, 69451 Weinheim