sulfonyl‐based azo‐chromophore moieties were utilized as co‐isolation groups for the nitro‐based moieties to achieve larger macroscopic second‐order nonlinear optical (NLO) effects. These high‐generation dendrimers (G4‐NS and G5‐NS) displayed very large NLO efficiencies (up to 253.0 pm V−1), which is, to the best of our knowledge, the record highest efficiency for simple azo‐chromophore moieties.
在此,通过分散和收敛的方法结合使用高纯度树枝状分子G4-NS和G5-NS,分别包含30和62个
偶氮苯生色团,可以方便地以高纯度和满意的收率制备。强大的Sharpless点击反应。这些树状聚合物具有规则的交替结构,分别是基于硝基和基于磺酰基的偶氮发色团,其中基于磺酰基的偶氮发色团被用作基于硝基的部分的共隔离基团,从而实现了较大的宏观二阶非线性光学(NLO)效果。这些高代树状聚合物(G4-NS和G5-NS)显示出非常高的NLO效率(最高253.0 pm V-1),据我们所知,简单的偶氮-发色团部分的效率最高。