2,2-二氰基甲叉-3-氰基-4-（N,N-二乙氨基苯乙烯基）-5,5-二甲基-2,5-二氢呋喃的合成及光学性质

设计并合成了＂D-π-A＂绿色发光化合物,2,2-二氰基甲叉-3-氰基-4-（N,N-二乙氨基苯乙烯基）-5,5-二甲基-2,5-二氢呋喃,用IR,1H NMR和元素分析表征了它的结构并测试了其在不同环境中的光谱性质。化合物在氯仿中（1×10-4mol/L）的最大波长吸收峰（λmax）位于535 nm处。在530 nm激发波长的激发下,该化合物显示出很强的荧光发射峰,位于681 nm（氯仿中）处。随着化合物（氯仿中）浓度的增加,荧光强度增强,但浓度增加至1×10-3mol/L时,出现猝灭现象。溶剂极性也对发射波长和荧光强度产生影响,随着溶剂极性增大,最大发射波长红移且荧光强度增强,从558 nm（苯中）红移到623 nm（丙酮中）。

Synthesis and Optical Properties of 2,2-Dicycnomethylene-3-Cyano-4-(N, N-Diethylamino-Styryl) -5,5-Dimethy-2,5-Dihydrofuran

The green light emitting compound, the ＂D-n-A＂ chromophore, or 2,2-dicycnomethyl- ene-3-cyano-4-（N,N-diethyamino-styryl）-5,5-dimethyl-2,5-dihydrofuran is designed and synthe- sized. IR,^1H NMR and elemental analysis are used to analyze its structure and test its spectral properties in different environments. The maximum absorption peak （λmax） Of the compound in chloroform （1× 10^-4 mol/L） is at 535 nm. Under the excitation wavelength of 530 nm, it shows strong fluorescence emission in chloroform and the peak stands at 681 nm. The fluorescence in- tensity is enhanced with the increase in concentration from 1×10^-7 mol/L to 1×10^-4 mol/L but quenched when intensity reaches 1×10^-3mol/L in chloroform. When the polarity of solvent in- creases, the maximum fluorescence wavelength is red shifted from 558 nm （in benzene） to 623 nm （in acetone） and the fluorescence intensity is enhanced.