期刊
NEW JOURNAL OF CHEMISTRY
卷 46, 期 33, 页码 16161-16171出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2nj02875a
关键词
-
资金
- University Grants Commission, New Delhi, India [F1-17.1/2017-18/RGNF-2017-18-SC-WES-37660/(SA-III/Website), 712/CSIR-UGC NET DEC.2017]
- CAS-V(UGC)
- Department of Chemistry, University of Calcutta
In this study, two unsymmetrical and dipodal Schiff-Mannich combo ligands were synthesized and used for the selective detection of Zn2+ in semi-aqueous media. The probes showed a turn-on response to Zn2+ due to chelation-induced enhanced fluorescence and photo-induced electron transfer. Experimental studies showed that H2BBH and H3BSH could detect Zn2+ in solutions with low limit of detections. The structures of probe-Zn2+ ensembles were proposed by various methods. Moreover, the probes were successfully employed in the detection of Zn2+ in different samples.
In this study, we synthesized two unsymmetrical and dipodal Schiff-Mannich combo ligands, namely benzoic acid (3-benzoimidazol-1-ylmethyl-2-hydroxy-5-methyl-benzylidene)-hydrazide (H2BBH) and the hydroxyl analogue 2-hydroxy-benzoic acid (3-benzoimidazol-1-ylmethyl-2-hydroxy-5-methyl-benzylidene)-hydrazide (H3BSH), for the selective detection of Zn2+ in semi-aqueous media. Both the probes selectively depict a turn-on response to Zn2+ as a result of the combined effect of chelation-induced enhanced fluorescence (CHEF) and photo-induced electron transfer (PET). Detailed experimental studies reveal that H2BBH and H3BSH can detect Zn2+ in solutions with limit of detections of 27 nM and 46 nM, respectively. The structures of probe-Zn2+ ensembles were proposed as [(HBBH)(2)Zn] and [(H2BSH)(2)Zn] by ESI-MS, FT-IR spectroscopy, H-1 NMR titration and DFT/TD-DFT methods. Moreover, both the probes were successfully employed in the detection of Zn2+ in HuH-7 cells, seedlings of chickpea and mung beans, and paper strips.
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