Different <i>ortho</i> and <i>para</i> Electronic Effects on Hydrolysis and Cytotoxicity of Diamino Bis(Phenolato) “Salan” Ti(IV) Complexes
作者:Dani Peri、Sigalit Meker、Cesar M. Manna、Edit Y. Tshuva
DOI:10.1021/ic101693v
日期:2011.2.7
Bis(isopropoxo) Ti(IV) complexes of diamino bis(phenolato) “salan” ligands were prepared, their hydrolysis in 1:9 water/THF solutions was investigated, and their cytotoxicity toward colon HT-29 and ovarian OVCAR-1 cells was measured. In particular, electronic effects at positions ortho and para to the binding phenolato unit were analyzed. We found that para substituents of different electronic features
制备了二氨基双(酚基)“ salan”配体的双(异丙氧基)Ti(IV)配合物,研究了它们在1:9水/ THF溶液中的水解作用,并对结肠HT-29和卵巢OVCAR-1细胞的细胞毒性为测量。特别地,分析了结合酚基单元的邻位和对位的电子效应。我们发现具有不同电子特征的对位取代基(包括Me,Cl,OMe和NO 2)对水解速率的影响很小,并且所有对位取代的邻位H络合物均缓慢水解,生成具有t 1的O桥簇。/ 2异丙醇释放时间为1-2小时。因此,也没有观察到清晰的细胞毒性模式,其中对位取代基的最大影响似乎是空间性的。这些复合物对所分析细胞的IC 50值为2-18μM ,其活性大部分高于Cp 2 TiCl 2,(bzac)2 Ti(OiPr)2和顺铂。相反,在邻位观察到主要的电子效应,其影响甚至超过空间位阻。邻位-氯或-溴取代的化合物具有极高的水解稳定性,其中几天没有异丙醇的大量释放。因此,对于邻-Cl和