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Issue 20, 2020
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Fluorometric detection of iodine by MIL-53(Al)-TDC

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The fluorescent properties of MIL-53(Al)-TDC are drastically changed due to the presence of iodine, even in small quantities, as a result of an energy transfer process from the host material (MIL-53(Al)-TDC) to the guest molecule (I2). While MIL-53(Al)-TDC's emission spectrum shows a weak and broad band, after I2 adsorption, it exhibits well-resolved and long-lasting emission lines, which could be exploited for iodine detection. Density Functional Theory periodical calculations demonstrated that in the most stable MIL-53(Al)-TDC⋯I2 configuration, the I2 molecule is bonded mainly by an O–H⋯I hydrogen bond. The QTAIM showed that other non-covalent interactions also provided stability to MIL-53(Al)-TDC⋯I2. The electrostatic potential analysis indicated that the I2 molecule adsorption occurs by a combination of specific interactions with a strong electrostatic contribution and weak interactions. These results postulate fluorescent MIL-53(Al)-TDC as an efficient I2 detector (potentially for radioactive I2), using a simple fluorimetric test.

Graphical abstract: Fluorometric detection of iodine by MIL-53(Al)-TDC

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Supplementary files

Article information

13 Mar 2020
14 Apr 2020
First published
14 Apr 2020

Dalton Trans., 2020,49, 6572-6577
Article type

Fluorometric detection of iodine by MIL-53(Al)-TDC

M. L. Díaz-Ramírez, B. Vargas, J. Raziel Álvarez, B. Landeros-Rivera, M. Rivera-Almazo, C. Ramos, J. Gabriel Flores, E. Morales, R. Vargas, J. Garza, E. González-Zamora, A. Martínez, D. Solís-Ibarra and I. A. Ibarra, Dalton Trans., 2020, 49, 6572
DOI: 10.1039/D0DT00945H

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