Aromatic Nitro-explosive Detection In The Use Of Small Molecule Fluorophores Of Alkynyl Substituted Triphenylamines

Our study used triphenylamine as the core and 1-ethynylpyrene, 4-fluorophenylacetylene, 4-methoxyphenylacetylene, phenylacetylene as recognition group, respectively,which had synthesized four kinds of sinskelion branched and three kinds of triskelion branched fluorophores via Sonogashira cross coupling reaction.Then we studied the fluorescence detection of various nitro compounds by the synthesized fluorophores.(1)These compounds were synthesized by sonogashira cross coupling reaction, and we verified the compounds by nuclear magnetic resonance, high resolution mass spectrometry, infrared spectroscopy and other means.(2) Compounds a and b, compounds e, f and g had the similar structure, respectively. It could be certified by UV-Vis absorption spectrum. But compound d which was attributed to macromolecular pyrene had the largest red-shift among fluorophores. The result showed that the spectral propertie of alkynyl triphenylamines was closely related to the molecular structure and spatial configuration.(3) With the increase amounts of nitro compounds, the fluorescence intensity became weakened gradually. The compound d in DMF solution exhibited high quenching sensitivity for TNT.