Ratiometric Fluorescent Chemosensor for Zn2+ Ions in Environmental Samples Using Supermicroporous Organic-Inorganic Structures as Potential Platforms
M. El-Sewify, Islam; Shenashen, Mohamed A.; Shahat, Ahmed; Yamaguchi, Hitoshi; Selim, Mahmoud M.; Khalil, Mostafa M.H.; El-Safty, Sherif A.;
Abstract
We report the fabrication of supermicroporous, fluorometric chemosensors with a Zr-metal–organic framework as carrier. The fabricated ratiometric fluorescent chemosensors (RFCs) were suitable for the selective and sensitive fluorometric recognition of ultra-trace concentrations of heavy metals, such as Zn2+ ions, in water sources. The RFCs were designed by performing direct pressure-assisted immobilization of a hydrophobic organic probe inside supermicroporous cubic Zr-MOFs. The immobilized organic probe exhibited high sensitivity and selectivity toward Zn2+ in a uniform super-microchannel pore, long-range intergrowing crystal structures. Ratiometric fluorometric sensing assay of the Zn2+ ions revealed the high selectivity of the ions in a mixture of multiple interfering ions. This phenomenon was due to the structure of the RFCs, the pH of the system, the composition of the competitive ion system, and the Zn-to-RFCs binding process, which occurred via electron transfer. The RFCs exhibited a wide detection and monitoring range for Zn2+ ions. The lower limit of detection was 0.16 ppb, and a fast response within seconds was observed during complexation with the Zn2+ ion target. The surface functionality and long-term stability of RFCs enable the practical and multiple reuse/cycles of Zn2+ ion recognition.
Other data
Title | Ratiometric Fluorescent Chemosensor for Zn<sup>2+</sup> Ions in Environmental Samples Using Supermicroporous Organic-Inorganic Structures as Potential Platforms | Authors | M. El-Sewify, Islam ; Shenashen, Mohamed A.; Shahat, Ahmed; Yamaguchi, Hitoshi; Selim, Mahmoud M.; Khalil, Mostafa M.H.; El-Safty, Sherif A. | Keywords | Chemosensors;Ratiometric;Supermicroporous;Zn ions 2+;Zr-MOFS | Issue Date | 1-Dec-2017 | Publisher | WILEY-V C H VERLAG GMBH | Journal | ChemistrySelect | Volume | 2 | Issue | 34 | Start page | 11083 | End page | 11090 | ISSN | 23656549 | DOI | 10.1002/slct.201702283 | Scopus ID | 2-s2.0-85041849776 | Web of science ID | WOS:000417743100019 |
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