研究目的
To develop selective and sensitive fluorescence recognition of Pb(II) in aqueous medium by organic nanoparticles of a urea linker based tetrapodal receptor and to study the effect of linker molecules in a sensor on chemosensing.
研究成果
P-ONPs showed selective chemosensing of Pb(II) with a limit of detection as 1.56 μM via PET-OFF mechanism, while R-ONPs did not recognize any metal ion. The study reveals the application of a tetrapodal ligand having urea receptor as a selective chemosensor for Pb(II) in an aqueous medium.
研究不足
The study is limited to the recognition behavior of P-ONPs and R-ONPs towards Pb(II) and other metal ions in aqueous medium. The effect of other environmental factors and the practical applicability in real samples were not extensively explored.
1：Experimental Design and Method Selection:
Synthesis of tetrapodal receptors P and R, preparation of their organic nanoparticles (ONPs) by re-precipitation method, and investigation of their recognition behavior towards various metal ions via fluorescence emission spectroscopy.
2：Sample Selection and Data Sources:
Metal nitrates solutions (5 mM) were prepared and added to ONP solutions for fluorescence emission studies.
3：List of Experimental Equipment and Materials:
BRUKER MICROTOF-QII for Mass spectroscopy, BRUKER SPECTROSPIN 300 MHz for NMR, NICOLET iS50 FT-IR for IR studies, SHIMADZU RF-5301 PC spectrofluorophotometer for fluorescence studies, MALVERN ZETASIZER for DLS, JEM-2100 JEOL for TEM, FLASH 2000 Organic Elemental Analyzer for elemental analysis, JSM-IT300 JEOL for SEM.
4：Experimental Procedures and Operational Workflow:
Synthesis of P and R, preparation of ONPs, fluorescence emission studies with various metal ions, fluorometric titration, interference studies, response time studies, and pH studies.
5：Data Analysis Methods:
Fluorescence emission spectra analysis, detection limit calculation, DFT calculations for structural and electronic properties.
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BRUKER MICROTOF-QII
MICROTOF-QII
BRUKER
Mass spectroscopy
-
BRUKER SPECTROSPIN
SPECTROSPIN 300 MHz
BRUKER
NMR spectroscopy
-
NICOLET iS50 FT-IR
iS50
Thermo Fisher Scientific
IR spectroscopy
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SHIMADZU RF-5301 PC spectrofluorophotometer
RF-5301 PC
SHIMADZU
Fluorescence emission studies
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MALVERN ZETASIZER
ZETASIZER
MALVERN
Dynamic Light Scattering (DLS) studies
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JEM-2100 JEOL
2100
JEOL
Transmission Electron Microscopy (TEM)
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FLASH 2000 Organic Elemental Analyzer
2000
Thermo Fisher Scientific
Elemental analysis
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JSM-IT300 JEOL
IT300
JEOL
Scanning Electron Microscopy (SEM)
-
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