Synthesis of a quinoxaline-hydrazinobenzothiazole based probe-single point detection of Cu, Co, Ni and Hg ions in real water samples.

A novel quinoxaline-hydrazinobenzothiazole based sensor was synthesized and characterized using NMR, FTIR, and Mass spectroscopy techniques. The sensor achieves the distinct "single-point" colorimetric and fluorescent detection of Cu, Co, Ni and Hg ions with distinguishable color changes from yellow to red, pale red, pale brown and orange, respectively. The UV-visible and fluorescence emission spectral investigation revealed the excellent single-point sensing ability of the probe towards four different heavy metal ions with a ratiometric response.

Iminobenzophenone-thiophen hydrazide schiff base: a selective turn on sensor for paramagnetic Fe ion and application in real sample analysis.

A highly selective turn-on sensor for paramagnetic Fe ions based on (E)-N'-((2-aminophenyl)(phenyl)methylene)thiophene-2-carbohydrazide is successfully synthesized. The sensor BPTH is significantly selective and sensitive towards Fe ions over other interfering metal ions especially Cu and Co ions with a lowest limit of recognition 1.48 × 10 M.