Synthesis and VOC ethylamine sensing properties of new colorimetric chemosensor based on thiobarbituric-isophorone chromophore

A new chemosensor based on thiobarbituric-isophorone chromophore (BIC) was synthesized and its volatile organic compounds (VOCs) EtNH2 sensing properties were investigated by UV-vis absorption spectroscopy. Upon the addition of EtNH2, the solution of BIC showed clear color change. Sensing mechanism of the BIC to EtNH2 were confirmed by 1NMR studies, together with theoretical calculations based on DFT and PPP-MO methods. We have investigated ability of complex formation based on the association constant, Kass. The BIC test strip was exposed to EtNH2 gas. Reversible response and recovery were achieved using alternating EtNH2 gas exposure.