Document Type : Original Research Article


1 Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran

2 Department of Chemistry, Iran University of Science and Technology, Tehran 16846-13114, Iran.



Nowadays metal-organic frameworks with multiple luminescent centers are very fascinating as multifunctional luminescent material because of their luminescence properties, which could be systematically tuned by deliberate use of organic ligands and metal ions. In this research, we explored a microporous mixed-ligand MOF for highly selective and sensitive detection of metal ions. A two-fold interpenetration pillared-layer amine/imine-functionalized MOF known as TMU-16-NH2, [Zn2(NH2-BDC)2(4-bpdh)]·3DMF, have been synthesized via a mixed ligand approach using amino-1,4-benzenedicarboxylate (NH2-BDC) and 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene (4-bpdh) under solvothermal condition. Sensor TMU-16-NH2 exhibits Al3+-selective TURN-ON and Fe3+-selective TURN-OFF type fluorescence emission responses, for which the electrostatic interaction between Fe3+ and Al3+ ions and the inner surface of the micropores may play a critical role. Moreover, the sensor TMU-16-NH2 shows significantly color change from light yellow to orange and colorless with the addition of Fe3+ and Al3+ ions, respectively, which is distinguished by naked-eye. More significantly, the remarkable quenching and enhancing effects of TMU-16-NH2 for Fe3+ and Al3+ possess the advantages of good selectivity, fast response time (<1min), low-cost, as well as very low detection limits of 0.7 and 0.09 µM for Fe3+ and Al3+, respectively. Interestingly, the probe exhibits high sensitivity for Fe3+ and Al3+ ions, which is far below WHO's acceptable limit in drinking water.

Graphical Abstract

An amine/imine functionalized microporous MOF as a new fluorescent probe exhibiting selective sensing of Fe3+ and Al3+ over mixed metal ions


Main Subjects

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