Novel Iminocoumarin Derivatives: Synthesis, Spectroscopic and Computational Studies
作者:Santosh B. Chemate、Nagaiyan Sekar
DOI:10.1007/s10895-015-1648-4
日期:2015.11
Three novel iminocoumarin derivatives with high quantum yield are synthesized from 3-benzimidazole substituted coumarin and different aromatic aldehydes. The photophysical behavior of the synthesized compounds was studied using UV-visible and fluorescence spectroscopy in polar and non-polar solvents. The compounds show absorption maxima at around 450 nm and emission maxima at around 500 nm. The quantum yields of compounds in dichloromethane and chloroform are more than 0.90. The absorption, emission and quantum yield of compounds are dependent on the polarity of solvents. Along with an intense absorption, these compounds show shoulder absorption peak in the studied solvents. The solvent polarity plots revealed the charge transfer process in the synthesized molecules from donor to acceptor. Density Functional Theory and Time Dependent Density Functional Theory computations have been used to have more understanding of the structural, molecular, electronic and photophysical parameters of the dyes. The dyes were characterized by FT-IR, 1H NMR, 13C NMR and mass spectral analysis.
从3-苯并咪唑取代香豆素和不同芳香醛合成了三种具有高量子产率的新型亚氨基香豆素衍生物。通过UV-可见光谱和荧光光谱在极性和非极性溶剂中研究了合成化合物的光物理行为。这些化合物在450nm左右显示最大吸收峰,在500nm左右显示最大发射峰。这些化合物在二氯甲烷和氯仿中的量子产率大于0.90。化合物的吸收、发射和量子产率依赖于溶剂�极性。除了强烈的吸收外,这些化合物在研究的溶剂中还显示肩峰吸收。溶剂极性图揭示了合成分子中从给体到受体的电荷转移过程。密度泛函理论和含时密度泛函理论计算被用来更好地理解染料的结构、分子、电子和光物理参数。通过FT-IR、1H NMR、13C NMR和质谱分析对染料进行了表征。