新型三腈基呋喃衍生物光谱特性的研究

通过两步反应合成了一种带有新型电子给体的D-π-A型三腈基呋喃衍生物(DCDHF-2-V),并采用旋涂法制备出与聚甲基丙烯酸甲酯(PMMA)共混均匀的聚合物薄膜.采用UV1700紫外可见分光光度计和F-4500荧光分光光度计研究了该化合物在不同极性溶剂以及薄膜状态下的吸收光谱和荧光光谱特性.结果表明,在薄膜状态下化合物的吸收峰有一定蓝移,吸收带变宽.随溶液极性的增加,荧光光谱的最人峰值波长逐渐红移,分子的荧光量子产率以及斯托克斯位移也有较大变化.据此计算出DCDHF-2-V分子激发态与基态偶极矩之差为35.68×10-30C·m,并根据双能级模型确定了分子的二阶非线性极化率β随波长的变化情况,当激光基频波长为1064 nm时,β为3323.4×10-40m4/V.

Study on Spectral Properties of a New Tricyanofuran Derivative

A new D-π-A type of tricyanofuran derivative (DCDHF-2-V) with a novel electron donor was synthesized. The heterocyclic compound-in-poly (methymethacrylate) (PMMA) film was then fabricated by means of the spin-coating method, and its photophysical properties in the solutions and thin film were investigated by UV-vis absorption spectra and fluorescence emission spectra. The results show that compared with the absorption spectrum of the compound in solution, the absorption maximum of the film is shifted to some extent, and the absorption band becomes broader. It is found that the maximum peak wavelength of fluorescence spectra, fluorescence quantum yield, and Stocks shift change along with the variation of the polarity of solvent. Moreover, the difference in the dipole moment between the ground and excited states was obtained to be 35.68×10-30 C·m. And the second-order polarizability value of DCDHF-2-V was estimated based on the quantum-mechanical two-level model and its calculated value was 3323.4×10-40 m4/V at the wavelength of 1064 nm.