吡啶盐二维电荷转移分子的设计、合成和超极化率的测定

Design, Synthesis of Two - Dimensional Charge Transfer Molecules Based on Pyridinium Salts and Determination of Their First Hyperpolarizability

设计、合成了以吡啶阳离子为吸电子基团的二维电荷转移非线性光学生色团分子——双四苯硼(反式)-4,4’-二{p-[N-乙基-N-羟乙基)氨基]苯亚乙烯基}-N,N’-(1,2-乙基)-2,2’-联吡啶盐和双四苯硼(反式)-N-己基一咔唑-3,6-二(p-亚乙烯基-N-羟乙基-吡啶盐),利用超瑞利散射技术(HRS)测定了这两种分子的第一超极化率β,在1064nm分别为786×10^(-30)esu和1770×10^(-30)esu.双能级模型计算得到的β_0的值分别为215×10^(-30)esu和119×10^(-30)esu.从分子结构的角度定性地分析了该类分子具有大β值的原因.

Two new two - dimensional charge transfer (2DCT) chromophore molecules for nonlinear optics (NLO) were designed and synthesized with pyridinium as electron acceptor group. They are trans - 4,4' - di {p - [(N - ethyl - N - hydroxyethyl) amino] styryl } - N, N' - (1,2- ethylene) - 2,2' - bipyridinium ditetraphenylborate and trans - N - hexyl - carbazole - 3,6 - di(p - ethenyl - N - hydoxyethyl - pyridinium) ditetraphenylborate. The first hyperpolarizability (β) values were determined by Hyper - Rayleigh Scattering (HRS) technique. The large β values are obtained as 786 × 10-30esu and 1770 × 10-30esu at 1064 run and corresponding β0 are 215 × 10-30 esu and 119 × 10-30 esu calculated according to two - level model, respectively. The large value of β was explained qualitatively from the point of view of molecular structure.