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Title
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A new fluorene-based Schiff-base as fluorescent chemosensor for selective detection of Cr 3+ and Al 3+
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Type
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JournalPaper
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Keywords
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Fluorescence, Chemosensor, Chromium and Aluminum ions, ESIPT, Schiff-base, DFT
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Abstract
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2-((9H-fluoren-2-ylimino) methyl)phenol (F3) was synthesized by condensation reaction of 9H-fluoren-2-amine and 2-hydroxybenzaldehyde in EtOH and characterized by its melting point, 1H-,13 C-NMR and molecular mass. F3 exhibits a high selectivity for detection of Cr3+and Al3+ionsas a fluorescent chemosensor and showed a single emission band at 536 nm upon excitation at 333 nm according to fluorescence emission studies. The addition of Cr3+ and Al3+make a significant increase in fluorescent intensity at 536 nm in CH3CN, while other metal ions have almost no influence on the fluorescence. The fluorescence enhancement was attributed to the inhibited C=N isomerization and the obstructed excited state intra-molecular proton transfer (ESIPT) of compound F3. Job’s plot and DFT calculations data showed that the binding stoichiometries of F3 with Cr3+and Al3+are 2:1. The association constants (Ka) for Cr3+and Al3+ were calculated and found to be 8.33 × 104M-1and 5.44 × 104M-1 , respectively. The detection limits were also calculated for Cr3+and Al 3+and found to be 2.5 × 10-7mol/L and 3.1 × 10-7mol/L, respectively.
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Researchers
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mahmood tajbakhsh (First Researcher), gholam babaei (Second Researcher), Mohammadreza Azizi Amiri (Not In First Six Researchers), Nahid Hasani (Fifth Researcher), Rahman Hosseinzadeh (Fourth Researcher), ahmadreza bekheradnia (Third Researcher)
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