酸性ガス検出塗料に適用可能な有機液体の開発

摘要

We developed the organic liquids based on conjugated compounds for detection of acid vapors. Liquid-state oligo(p-phenyleneethynylene)s containing pyridine rings (OPE-Py)1 and 2 as organic liquids were synthesized by a Pd-catalyzed Sonogashira cross-coupling reaction between a diethynyl monomer and a pyridine monomer which were used as acid vapor responsive chemical sensors. Differential scanning calorimetry (DSC) showed that OPE-Py 1 and 2, which had long branched alk-oxy side chains, were liquid at room temperature. We investigated the relationship between changes in their fluorescence properties and protonation/deprotonation of OPE-Py 1 and 2 liquids. Treatment with acid vapor caused a red shift in the fluorescence spectrum and changes in the fluorescence color of OPE-Py 2 ; treatment with base vapor reversed these changes. Liquid-state OPE-Py 2 is an effective and reusable chemical sensor for acid vapor. Thus, organic liquids based on conjugated compounds acts reusable and sensitive chemical sensors for acid vapors.