Switching from sandwich to half-sandwich complexes decreased the electrochemical potentials drastically, showing better stabilization of the cerium(IV) center in the case of Cp*Ce(OR)3 than in the case of Cp*2Ce(OR)2. Enhanced stabilization of the cerium +IV oxidation state could be further demonstrated in the series alkoxy > siloxy > aryloxy as well as C5Me5 > C5HMe4.
在
六氯乙烷存在下用碱
金属醇盐和
硅氧化物处理 Cp* 2 CeCl 2 K(THF) 生成单体双(五
甲基环戊二烯基)
铈(IV)配合物 Cp* 2 Ce(OR) 2 (Cp* = C 5 Me 5;R = Et、i Pr、CH 2 t Bu、t Bu、SiMe 3或 SiPh 3 )。大的取代基 R 触发
配体加扰到半夹心配合物 Cp*Ce(OR) 3,可以分离出 R = t Bu 和 SiPh 3。与芳氧基
钠 NaOAr (OAr = OC 6H 3 i Pr 2 -2,6) 导致 Cp* 2 Ce(OAr)Cl。三(
环戊二烯基)配合物Cp R 3 CeCl (Cp H = Cp = C 5 H 5;Cp Me = C 5 H 4 Me)用NaOAr处理得到Cp Me 2 Ce(OAr) 2和Cp 3 Ce(OAr)。
铈 (IV) 配合物在固态下显示出假四面体几何形状。循环伏安法显示大部分
化学