Novel pyridyl based azo-derivative for the selective and colorimetric detection of nickel(II)

• Pyridyl based chemosensor has been synthesized.
• Spectral characterization of the chemosensor has been carried out.
• Colorimetric and naked eye detection of nickel(II) has been carried out over other metal ions.
• Electronic structure of chemosensor and its nickel(II) complex have been interpreted by DFT computations.

A highly sensitive and selective pyridyl based colorimetric chemosensor (H2L) for the efficient detection of Ni2 + has been reported. The synthesized chemosensor H2L is highly efficient in detecting Ni2 + even in the presence of other metal ions that commonly co-exist with Ni2 +. H2L also shows distinct color change from green to deep red visible under naked eye due to specific binding with Ni2 +. This color change is due to formation of a new band at 510 nm upon gradual addition of Ni2 +. The association constant has been found to be 1.27 × 105 M− 1 with limit of detection (LOD) of 8.3 × 10− 7 M. Electronic structure of the H2L–Ni2 + complex and sensing mechanism have been interpreted theoretically by DFT and TDDFT calculations.

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