Selective recognition of Ni2+ ion based on fluorescence enhancement chemosensor

• A new fluorescent enhancement chemosensor is introduced for Ni2+ ion.
• The new probe exhibits high selectivity to Ni2+ ion over the other common cations.
• Fluorescence enhancement of L is attributed to 1:1 complex formation with Ni2+ ion.

A new enhancing fluorescent chemosensor was introduced for selective and sensitive determination of nickel ions based on 2-(1-H-benzo[d]imidazol-2yl)-N-phenyl hydrazine carbothioamide (L). L has an intrinsic fluorescent emission which enhances in presence of nickel ions in CH3CN/H2O (70:30, v/v) solution. The fluorescence enhancement of L is attributed to a 1:1 complex formation between L and Ni2+ ion which has been used for selective detection of Ni2+ ion. At the optimum conditions, the fluorescence intensity of L at 352 nm enhances linearly by the concentration of nickel ion from 1.6 × 10−5 to 1.6 × 10−7 M and detection limit of 7.9 × 10−8 M. The new fluorescent probe exhibited high selectivity to Ni2+ ion over the other common mono, di-and trivalent cations.

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