Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 212, Issue -, Pages 222-231Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2018.12.053
Keywords
Schiff base; Zn sensor; UV-Vis; PL and TCSPC; Molecular logic gate; Cell imaging
Categories
Funding
- University Grants Commission, New Delhi, India [PSW-155/14-15, WV6-027, 223832]
- University Grants Commission, India [F.4-2/2006(BSR)/CH/14-15/0163]
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A novel Schiff base L composed of fluorescein hydrazine and a phenol functionalized moiety has been designed and prepared via cost-effective condensation reaction. The L is utilized for selective sensing of Zn2+ over other environmental and biological relevant metal ions in aqueous alcoholic solution under physiological pH range. The binding of Zn(2+ )to the receptor L is found to causes -23 fold fluorescence enhancement OIL. The 1:1 binding mode of the metal complex is established by combined UV-Vis, fluorescence, and HRMS (high-resolution mass spectroscopy) spectroscopic methods. The binding constant (K-a) for complexation and the limit of detection (LOD) of Zn2+ is calculated to be 2.86 x 10(4) M-1 and 1.59 mu M, respectively. Further photophysical investigations including steady-state, time-resolved fluorescence analysis and spectral investigations including NMR (nuclear magnetic resonance), IR (infrared spectroscopy) suggest introduction of CHEF (chelation enhance fluorescence) with the suppression of C=N isomerization and PET (photo-induced electron transfer) mechanism for the strong fluorescent response towards Zn2+. Finally, the sensor L is successfully employed to monitor a real-time detection of Zn2+ by means of TLC (thin layer chromatography) based paper strip. The L is used in the cell imaging study using African green monkey kidney cells (Vero cells) for the determination of exogenous Zn2+ by Immunofluorescence Assay (IFA) process. (C) 2019 Elsevier B.V. All rights reserved.
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