2,2′-Bipyridine-Based Dendritic Structured Compounds for Second Harmonic Generation
作者:Marina Büchert、Torben Steenbock、Christian Lukaschek、Marie C. Wolff、Carmen Herrmann、Jürgen Heck
DOI:10.1002/chem.201404001
日期:2014.10.27
metal coordination. Four dipolar single‐strand chromophores decorated with a 5‐electron‐donor–5′‐electron‐acceptor‐modified 2,2′‐bipyridine functionality were synthesized. For two of these chromophores triple‐stranded dendritic structures were successfully formed. All of the compounds were characterized with respect to their linear and nonlinear optical properties. For the aldehyde derivatives an enhancement
偶极电子给体-π桥-电子受体实体的平行排列可以大大增强其非线性光学性质。原则上,这种有利的布置可以通过将这些单元共价连接或通过金属配位来实现。合成了装饰有5-电子供体-5'-电子受体修饰的2,2'-联吡啶官能团的四个偶极单链发色团。对于其中两个生色团,成功形成了三链树状结构。所有化合物均具有线性和非线性光学特性。对于醛衍生物,当从单链变为三链时,第一超极化率提高了4.5,而不是3。