Synthesis, characterization, and metal complexes of a salen ligand containing a quinoline base
Synthesis, characterization, and metal complexes of a salen ligand containing a quinoline base
复制标题
DOI：
10.1021/om0205795
复制
发表时间：
2003-02-17
期刊：
影响因子：
2.8
通讯作者：
Kozlowski, MC
中科院分区：
文献类型：
--
作者：
DiMauro, EF;Mamai, A;Kozlowski, MC
含有分子内碱基的金属salen配合物已被设计用作双功能催化剂。为此，合成了一种含有喹啉碱和salen核的配体。钌，铬，钛，锌络合物的salen已形成和表征。的mu-氧代钛二聚体的晶体结构，将双功能配体显示出典型的萨伦配位模式，并说明喹啉基团的氮既不参与内，也不参与分子间的协调。此外，喹啉基团以适当的方式取向，以充当在这些络合物的顶端位置处协调的基底。作为喹啉碱可以改变salen金属络合物的活性的指示，二烷基锌与醛的加成显示出相对于缺乏喹啉基团的salen，喹啉salen配体加速。
Metal salen complexes containing intramolecular bases have been designed for use as bifunctional catalysts. A ligand containing a quinoline base and the salen core has been synthesized for this purpose. Ruthenium, chromium, titanium, and zinc complexes of the salen have been formed and characterized. A crystal structure of a mu-oxo-titanium dimer incorporating the bifunctional ligand shows a typical salen coordination pattern and illustrates that the nitrogens of the quinoline groups participate in neither intra- nor intermolecular coordination. In addition, the quinoline groups orient in an appropriate manner to act as bases toward substrates coordinated at the apical positions of these complexes. As an indication that the quinoline bases can alter the activity of salen metal complexes, the addition of dialkylzincs to aldehydes was shown to be accelerated by the quinoline salen ligand relative to a salen lacking the quinoline groups.