Chiral {bis[N,N′-(2-ethyl-6-methylphenyl)imino]-1,2-dimethylethane}dibromonickel bearing sec-phenethyl groups: Synthesis, characterization and application in synthesis of nanosized dendritic polyethylene
作者:Jianchao Yuan、Fengying Song、Jing Li、Zong Jia、Fuzhou Wang、Bingnian Yuan
DOI:10.1016/j.ica.2013.02.009
日期:2013.5
A series of bis[N,N’N′-(2-ethyl-6-methylphenyl)imino]-1,2-dimethylethane}dibromonickels have been synthesized and characterized. The crystal structures of representative chiral ligand, bis[N,N’N′-(2-ethyl-6-methyl-4-s-phenethylphenyl)imino]-1,2-dimethylethane (S,R)–2a and its chiral complex, bis[N,N’N′-(2-ethyl-6-methyl-4- sec-phenethylphenyl)imino]-1,2-dimethylethane}dibromonickel (S,R)–3a, have
一系列双[ Ñ,N” Ñ ' - (2-乙基-6-甲基苯基)亚氨基] -1,2-二甲基乙烷} dibromonickels已被合成和表征。代表性手性配体的晶体结构,双[ Ñ,N” Ñ ' - (2-乙基-6-甲基-4-S-苯乙基苯基)亚氨基] -1,2-二甲基乙烷(S,R) -图2a和其手性复杂的,二[ ñ,N” ñ ' - (2-乙基-6-甲基-4-仲丁基苯乙基苯基)亚氨基] -1,2-二甲基乙烷} dibromonickel(S,R) - 3a中,已经通过X证实射线晶体学分析。手性(S,R)的不对称单元-图2a含有一个半分子,该半分子表现出晶体学上施加的对称中心。1,4-二氮杂丁二烯片段中的单个C-C键是反式构型的,并位于一个反转中心。但是,反式构型的配体可以转化为顺式构型的配体,以促进手性络合物(S,R)-3a的形成。配合物(S,R)– 3a在镍中心周围具有准四面体几何形状。络合物(S,R)–