含1,8-二甲氧基-9,10-二氢蒽和巴比妥酸的发色团化合物的合成和NLO性质

在哌啶和醋酸催化下，1,8-二甲氧基-4,5-二甲酰基-9,10-二氢蒽和异佛尔酮巴比妥酸衍生物经Knoevenagel缩合合成了具有NLO性质的发色团化合物。在这些发色团中，环锁定的三烯和9,10-二氢蒽用作共轭桥，巴比妥酸和甲氧其分别作为吸电子和给电子基, 组成非共轭的两个D-π-A单位。溶剂变色法和紫外光谱研究证实它们比相应的参考物有较大的NLO活性并能保持与参考化合物相同的透光性。

Synthesis and NLO Properties of Chromophores with 1,8‐Dimethoxy‐9,10‐dihydroanthracene and Thiobarbituric acid Moieties

The new chromophore molecules with nonlinear optical (NLO) properties were prepared by Knoevenagel condensation from 4,5‐diformyl‐1,8‐dimethoxy‐9,10‐dihydroanthracene and thiobarbituric acid derivatives in the presence of piperidine and acetic acid. In these chromophores, the ring‐locked triene employed as a conjugation bridge and the thiobarbituric acid moiety was as an electron acceptor in a D‐π‐A units. The solvatochromism and UV spectra indicate that they have higher second‐order nonlinear polarizability μβ values than the corresponding reference compound, without causing a large red shift of the charge transfer band.