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

Azine based new colorimetric sensor 1 for the detection of gasotransmitter HS has been reported. Sensor 1 used to detect the HS 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 HS detection using deprotonation mechanism. HS 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 HS in biological fluids such as human serum and mouse serum. Moreover, for the first time, we have shown the applicability of HS for the construction of half subtractor molecular logic gate.