Issue 29, 2021

A luminescent cationic MOF for bimodal recognition of chromium and arsenic based oxo-anions in water

Abstract

Water pollution from heavy metals and their toxic oxo-anionic derivatives such as CrO42−, Cr2O72−, HAsO42−, and HAsO32− has become one of the most critical environmental issues. To address this, herein, we report a new hydrolytically stable luminescent Zn(II) based cationic metal organic framework (MOF), iMOF-4C, which further successfully exhibited a rare dual “turn off/on” fluorescence response toward Cr(VI), As(V) and As(III) based oxo-anions respectively in water medium. In addition, iMOF-4C was found to maintain its superior selectivity in the presence of other concurrent anions (e.g. SO42−, Cl, Br, ClO4, NO3, SCN and CO32−). More importantly, iMOF-4C exhibited an excellent selective and sensitive luminescence “turn-off” response towards CrO42− and Cr2O72− anions in water medium with the quenching constant (Ksv) values as high as 1.31 × 105 M−1 (CrO42−) and 4.85 × 105 M−1 (Cr2O72−), which are found to be the highest among the values reported in the regime of MOFs. Interestingly, iMOF-4C showed fluorescence “turn-on” response toward HAsO42− and HAsO32− with an enhancement coefficient (Kec) of 1.98 × 104 M−1 and 3.56 × 103 M−1 respectively. The high sensitivity and low detection limits make iMOF-4C more feasible for real-time sensing of such toxic oxo-anions in an aqueous medium. Furthermore, the probable sensing mechanism has been investigated by DFT calculation studies and discussed in detail.

Graphical abstract: A luminescent cationic MOF for bimodal recognition of chromium and arsenic based oxo-anions in water

Supplementary files

Article information

Article type
Paper
Submitted
01 ஏப்ரல் 2021
Accepted
04 ஜூன் 2021
First published
08 ஜூன் 2021

Dalton Trans., 2021,50, 10133-10141

A luminescent cationic MOF for bimodal recognition of chromium and arsenic based oxo-anions in water

S. Dutta, S. Let, M. M. Shirolkar, A. V. Desai, P. Samanta, S. Fajal, Y. D. More and S. K. Ghosh, Dalton Trans., 2021, 50, 10133 DOI: 10.1039/D1DT01097B

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements