Utilization of Schiff base-Co(II) complex as a stable luminescent probe for the highly selective detection of 2,4,6-trinitrophenol in an aqueous medium

Abstract

In this study, the fluorescence properties of Co(II) Schiff base complex (Co(II) complex) were examined. The sensor properties of the Co(II) complex nitroaromatic compounds [(DNB, TNT, DNT, 2-NP, 4-nitrophenol (NP), 2,4-dintrophenol (DNP) and 1,3,5-trinitrophenol (TNP) e.g.,] were investigated by fluorescence spectroscopy. Compound has high sensitivity for the sensing of 1,3,5-trinitrophenol (TNP) (Ksv: 4.74 x 10(4) M-1) with low LOD of 0.034 mu M. It was revealed that the complex ([CoLCl(H2O)(2)]center dot 2H(2)O) exhibited strong fluorescence properties. Additionally, the synthesized Co(II) complex was utilized for fluorescence quenching-based TNP detection in water solution with high selectivity and sensitivity. The stoichiometry of the compound and TNP was found to be 1:1 (ligand/TNP) via fluorescence titrations (Job's plot).