4-取代吡啶双发色团半菁染料的微波合成及光谱性质的研究

Microwave-Assisted Synthesis and Spectral Properties of Several 4-Substituted Pyridinium Dichromophoric Hemicyanine Dyes

在微波促进无溶剂条件下,由烷基α,γ-二(4-甲基吡啶)碘盐与取代芳香醛在哌啶作用下合成了一系列双发色团半菁染料产物,结构由1H NMR、UV等表征手段得到确认。该方法操作简便,环境友好,测定了所有半菁染料在4种不同溶剂中的紫外-可见吸收光谱和荧光发射光谱。结果表明,紫外-可见吸收光谱受染料分子结构的影响较大,而荧光发射光谱受溶剂极性影响很大。

Several dichromophoric hemicyanine dyes were synthesized in a fast, efficient and environmentally friendly method by the condensation of Alkane α, γ-bis[4-methylpyridinium] diiodide with aromatic aldehydes in the present of piperidine under solvent-free microwave irradiation. The electronic absorption and the emission spectra for all the hemicyanines were measured in four organic solvents of varying polarity. The results showed that the absorption spectra of tested compounds were affected by their structure. The fluorescence bands' positions, in contrast to the absorption, were strongly affected by the solvent polarity.