Colorimetric sensor for the detection of H2S and its application in molecular half-subtractor.

Azine based new colorimetric sensor 1 for the detection of gasotransmitter H2S has been reported. Sensor 1 used to detect the H2S with a remarkable red shift of 105 nm in the absorption spectra with a colour change from light yellow to brown red. Importantly, rare example of azine derivative has been used as a colorimetric probe for H2S detection using deprotonation mechanism. H2S induced deprotonation of one of the -OH proton followed by a change in resonance of 1 is responsible for the ratiometric spectral and colour change. The detection response was quick and the LOD calculated as 18.2 μM. Sensor 1 was also explored in the detection of H2S in biological fluids such as human serum and mouse serum. Moreover, for the first time, we have shown the applicability of H2S for the construction of half subtractor molecular logic gate.