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

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Abstract

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


Submitted
13 Mar 2020
Accepted
14 Apr 2020
First published
14 Apr 2020

Dalton Trans., 2020, Advance Article
Article type
Communication

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, Advance Article , DOI: 10.1039/D0DT00945H

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