A highly sensitive and selective Schiff-base probe as a colorimetric sensor for Co and a fluorimetric sensor for F and its utility in bio-imaging, molecular logic gate and real sample analysis.

In this work, we designed a novel Schiff-base probe from the condensation reaction of 3,5-diiodosalicylaldehyde with isoniazid. Treatment of the sensor molecule with different metal ions like K, Ba, Ca, Mg, Fe, Mn, Co, Cu, Cd, Ni, Hg, Zn, Pb and Al in visual inspection and absorption measurements explained its colorimetric sensing ability. The sensor DISN displays a remarkable color variation from pale yellow to brownish-orange towards Co ion.