A quinazolin-based Schiff-base chemosensor for colorimetric detection of Ni2+ and Zn2+ ions and 'turn-on' fluorometric detection of Zn2+ ion. Issue 53 (30th November 2022)

• Record Type: Journal Article
• Authors: Sharma, Vanshika; Sahu, Meman; Manna, Amit Kumar; De, Dinesh; Patra, Goutam Kumar
• Is Part Of: RSC advances. Volume 12:Issue 53(2022)
• Page Start: 34226
• Page End: 34235
• Publication Date: 2022-11-30
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d2ra05564c
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : A quinazolin based novel Schiff base chemosensor (L ) has been reported for colorimetric detection of Ni 2+ ion and fluorescent-colorimetric detection of Ni 2+ and Zn 2+ ions with minimum detection limits of 7.9 nM and 1.7 nM respectively. Abstract : Herein, we have reported a novel quinazolin-based Schiff base chemosensor ( E )-2-benzamido- N ′-(1-(pyridin-2-yl)ethylidene)benzohydrazide (L ). L has been designed, synthesised and characterised by 1 H-NMR, IR spectroscopy, ESI-MS spectrometry and theoretical studies. The receptor showed appreciable colorimetric λ max shift for both Ni 2+ and Zn 2+ ions and fluorometric " turn on " response in presence of only Zn 2+ ion. The Jobs plot analysis revealed that receptor forms 2 : 1 complex with both the ions Ni 2+ and Zn 2+, further confirmed by ESI-MS analysis. The single crystal structure of L –Ni 2+ complex (1 ) has also been determined. The colorimetric detection limits were calculated to 7.9 nM and 7.5 nM respectively for Ni 2+ and Zn 2+ in methanol–Tris–HCl buffer medium (10 mM, pH 7.2, 1 : 1 v/v). The chemosensor L can be applied for the recovery of contaminated water samples.