Three organic fluorescent compounds containing tertiary amines and vinyl ether unconventional chromophores were prepared under catalyst-free and solvent-free conditions by hydroxy-alkyne click reaction of methyl propiolate with 2-diethylaminoethanol,N-methyldiethanolamine and triethanolamine at room temperature,respectively.The structures of the obtained compounds were characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (NMR).The fluorescence properties of the compounds were investigated by ultraviolet-visible spectrophotometer (UV-Vis) and fluorescence spectrophotometer.It was found that the obtained compounds exhibited concentration-enhanced luminescence and excitation-dependent fluorescence properties.The emission wavelengths of the compounds obtained by triethanolamine,N-methyldiethanolamine and 2-diethylaminoethanol were red-shifted in order and the degree of red-shift depended on the concentration,showing the structure- and concentration-dependent red-shifted fluorescence properties.Thus,the unconventional organic fluorescent compounds with long emission wavelength could be obtained by simply regulating the structure and concentration,which provided a new and facile approach and idea for the design of long-wavelength unconventional fluorescent materials.
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基金资助
国家自然科学青年基金项目(51903020);江苏省自然科学青年基金项目(BK20190932)
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