A cobalt (II) complex based on antipyrine derived schiff base as colorimetric sensor for Fe3+ ion

A novel complex Co(NO₃)₂(APTY)₂H₂O] (1) is synthesized based on 1,5-dimethyl-2-phenyl-4-{(1E)-pyridine-4-ylmethylene]amino}-1,2-dihydro-3H-pyrazol-3-one) antipyrine (APTY) and the structure of complex (1) is characterized via PXRD, SEM, FTIR and X-ray single crystal diffraction technique. It is found that the complex (1) has a good response to Fe³⁺ ion with colorimetric yellow change. In addition, we demonstrate that the sensing mechanism of complex (1) could is due to the disruption of complex (1) framework and the formation of complex Fe-APTY. The stability, rapid response and low detection limit enable this complex (1) to be a good Fe³⁺ ion chemical sensor for biological and environmental sensing applications.