The synthesis and solvatochromic behavior of four novel carbazole based fluorescent styryl dyes were explained. In chlorinated solvents such as DCM and chloroform, these dyes show bathochromic shift in their absorption as well as emission. The styryl dyes 6b and 6c show solid state yellow fluorescence. DFT and TD-DFT computations were performed to study structural, molecular, electronic and photophysical properties of these dyes. The computed absorption and emission wavelength values are found to be in good agreement with the experimental results. The photophysical properties of these 1-styryl carbazole dyes are also compared with the recently reported 3-styrl carbazole dyes. The unique behavior of dye 6d is well explained by its optimized geometry found in the excited state. Ratio of ground to excited state dipole moment of the synthesized novel styryl compounds were calculated by Bakhshiev and Bilot-Kawski correlations.
四种新型基于氮杂环的荧光
苯乙烯染料的合成及溶剂变色行为进行了阐述。在
氯化溶剂如
二氯甲烷和
氯仿中,这些
染料的吸收和发射均显示出红移现象。
苯乙烯染料6b和6c在固态下呈现黄色荧光。为了研究这些
染料的结构、分子、电子及光物理性质,进行了DFT和TD-DFT计算。计算得到的吸收和发射波长值与实验结果一致。将这些1-
苯乙烯基氮杂环
染料的光物理性质与最近报告的3-
苯乙烯基氮杂环
染料进行了比较。
染料6d的独特行为通过其在激发态下的优化几何结构得到了良好的解释。合成的新型
苯乙烯化合物的基态与激发态的偶极矩比率通过Bakhshiev和Bilot-Kawski相关关系进行了计算。