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Issue 2, 2021
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A novel CdII-based metal–organic framework as a multi-responsive luminescent sensor for Fe3+, MnO4, Cr2O72−, salicylaldehyde and ethylenediamine detection with high selectivity and sensitivity

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Abstract

A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4 and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.

Graphical abstract: A novel CdII-based metal–organic framework as a multi-responsive luminescent sensor for Fe3+, MnO4−, Cr2O72−, salicylaldehyde and ethylenediamine detection with high selectivity and sensitivity

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Supplementary files

Article information


Submitted
28 Oct 2020
Accepted
19 Nov 2020
First published
19 Nov 2020

CrystEngComm, 2021,23, 482-491
Article type
Paper

A novel CdII-based metal–organic framework as a multi-responsive luminescent sensor for Fe3+, MnO4, Cr2O72−, salicylaldehyde and ethylenediamine detection with high selectivity and sensitivity

L. Wu, S. Yao, J. Li, H. Xu, T. Zheng, S. Liu, J. Chen and H. Wen, CrystEngComm, 2021, 23, 482
DOI: 10.1039/D0CE01575J

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