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Fluorescein Hydrazide-Appended Metal–Organic Framework as a Chromogenic and Fluorogenic Chemosensor for Mercury Ions
| Content Provider | MDPI |
|---|---|
| Author | Helal, Aasif Naeem, Muhammed Fettouhi, Mohammed Zahir, Hasan |
| Copyright Year | 2021 |
| Description | In this work, we prepared a fluorescein hydrazide-appended Ni(MOF) (Metal–Organic Framework) $[Ni_{3}(BTC)_{2}(H_{2}O)_{3}]·(DMF)_{3}(H_{2}O)_{3}$ composite, FH@Ni(MOF). This composite was well-characterized by PXRD (powder X-ray diffraction), FT-IR (Fourier transform infrared spectroscopy), $N_{2}$ adsorption isotherm, TGA (thermogravimetric analysis), XPS (X-ray photoelectron spectroscopy), and FESEM (field emission scanning electron microscopy). This composite was then tested with different heavy metals and was found to act as a highly selective and sensitive optical sensor for the $Hg^{2+}$ ion. It was found that the aqueous emulsion of this composite produces a new peak in absorption at 583 nm, with a chromogenic change to a pink color visible to the naked eye upon binding with $Hg^{2+}$ ions. In emission, it enhances fluorescence with a fluorogenic change to green fluorescence upon complexation with the $Hg^{2+}$ ion. The binding constant was found to be 9.4 × $10^{5}$ $M^{−1}$, with a detection limit of 0.02 μM or 5 ppb. This sensor was also found to be reversible and could be used for seven consecutive cycles. It was also tested for $Hg^{2+}$ ion detection in practical water samples from ground water, tap water, and drinking water. |
| Starting Page | 5773 |
| e-ISSN | 14203049 |
| DOI | 10.3390/molecules26195773 |
| Journal | Molecules |
| Issue Number | 19 |
| Volume Number | 26 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-09-23 |
| Access Restriction | Open |
| Subject Keyword | Molecules Analytical Chemistry Spectroscopy Metal–organic Framework Composite Fluorescein Hydrazide Chromogenic Fluorogenic |
| Content Type | Text |
| Resource Type | Article |
