烷胺基丁二烯类紫外线吸收剂的性能研究

Research on Performance of 1-Alkylamino Butadiene UV-Absorbers

以光照实验对烷胺基丁二烯类紫外线吸收剂光稳定性和光敏化能力进行了研究 .实验表明它们不具备产生单线态氧的能力 ,当 C- 4位的吸电子基是氰基时 ,光稳定和光吸收性能较好 ,而为酯基时 ,光化学性能较差 .根据文献参数以 PPP- CI分子轨道计算法计算了紫外线吸收剂的最大吸收波长 λmax和振子强度 f,λmax的计算值与实验值有很好的一致性 ,振子强度 f>1 。

The experiments of light stability and light sensitization were performed for 1 alkylamino butadiene UV absorbers. The results suggest that they are not capable of producing singlet oxygen. Their light stability and light absorption are good when the electron withdrawing groups of C 4 are cyan group, while the function of photochemistry is relatively poor when the electron withdrawing group(s) of C 4 is ester group(s). The maximum absorption wavelengths ( λ max ) and the vibrator intensities (f) of UV absorbers were calculated by PPP CI MO method in terms of the parameters reported in references. An excellent agreement of the calculation with the experimental results has heen obtained for λ max . For f <1, the molar extinction coeffcients ε max of experiments increase with the increase of f .