respectively, good agreement with DFT estimations is obtained. The nonlinear optical coefficient for poled PMMA-based films, containing 20 wt% of isomeric indolizine chromophores with weaker dicyanomethylene (DCM) acceptor and with π- bridge expanded by isophorone moiety, achieves 36 pm/V, thus exceeding those for materials containing chromophores with stronger Ph-TCF or Hex-TCP acceptors and with short vinylene
首次研究并比较了具有不同受体部分的基于
吲哚嗪的推挽发色团的非线性光学(NLO)活性。所有发色团在光谱的可见(橙红色)部分均显示出较强的吸收带,其ε为。10 5 L∙cm -1 ∙M -1特别取决于介质极性。用Hex-
TCP代替Ph-TCF受体会导致第一个超极化率值增加两倍。通过电
化学方法估算的能隙按系列ΔE1a ,b >ΔE3a ,b >Δ
E2a ,b减小对于分别具有Ph-TCF,DCM和Hex-
TCP受体的化合物,与DFT估计值具有良好的一致性。极化P
MMA基薄膜的非线性光学系数达到36 pm / V,包含具有20重量%的异构
吲哚嗪发色团,较弱的二
氰基亚
甲基(DCM)受体和被
异佛尔酮部分扩展的π桥的非线性光学系数,因此超过了包含更强的Ph-TCF或Hex-
TCP受体,并带有短的亚
乙烯基π桥。