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Research Article

N’-(4-(diethylamino)-2-hydroxybenzylidene) isonicotinohydrazide based chemosensor for nanomolar detection of Ni(II) ion

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Pages 7135-7151 | Received 30 Nov 2020, Accepted 05 Aug 2021, Published online: 06 Oct 2021
 

ABSTRACT

A novel Schiff base, N’-(4-(diethylamino)-2-hydroxybenzylidene) isonicotinohydrazide (S1) was synthesised by the condensation reaction between isonicotinohydrazide and 4-(diethylamino)-2-hydroxybenzaldehyde. The chemo-sensing behaviour of S1 towards Ni2+ was investigated and confirmed that the S1 exhibited fair selectivity and sensitivity. Furthermore, it was noted that there was no significant effect of co-existing cations and anions on the detection of Ni2+. The complexation ratio of S1 and Ni2+ was confirmed as 1:1 with Jobs continuous variation method and two isosbestic points on absorption titration further supported by DFT calculations. The binding constant (Kb) for S1+Ni2+ was calculated as 22,769 M−1 and 22,134 M−1. Moreover, the obtained limit of detection (LOD) for Ni2+ was found to be 375 nM. Finally, chemosensing applications of S1 as a paper test strip kit in the environmental monitoring assessment laboratory for the recovery of Ni2+ from real water samples were successfully designed and evaluated.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Supplementary material

Supplemental data for this article can be accessed here

Additional information

Funding

Taif University Researchers Supporting Project Number (TURSP-2020/04), Taif University, Taif, Saudi Arabia

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