Issue 44, 2018

Two luminescent lanthanide(iii) metal–organic frameworks as chemosensors for high-efficiency recognition of Cr(vi) anions in aqueous solution

Abstract

Two new lanthanide(III) metal–organic frameworks (MOFs) {[(CH3)2NH2]2[Ln4(FDA)7(DMF)2]·0.5DMF}n [Ln = Eu (1), and Tb (2)] based on furan-2,5-dicarboxylic acid (H2FDA) have been successfully assembled and well characterized in detail. These MOFs are isostructural and demonstrate 12-connected sqc15 topologies, which are rarely observed in MOF chemistry, especially in lanthanide(III) MOFs. Moreover, these two MOFs could show a tolerance towards moisture and organic solvents and satisfactory chemical stabilities. More importantly, they exhibit sensitive and selective luminescence quenching response towards Cr2O72− and CrO42− anions in aqueous solution with the average quenching Ksv values of 1.25 × 104 L mol−1 (Cr2O72−) and 3.56 × 103 L mol−1 (CrO42−) for 1 and 1.46 × 104 L mol−1 (Cr2O72−) and 4.35 × 103 L mol−1 (CrO42−) for 2 and the detection limits of 1.14 × 10−4 mol L−1 (Cr2O72−) and 1.12 × 10−4 mol L−1 (CrO42−) for 1 and 7.42 × 10−5 mol L−1 (Cr2O72−) and 1.27 × 10−4 mol L−1 (CrO42−) for 2. The high quenching Ksv values and low detection limits make them more feasible in sensing Cr(VI) anions in aqueous solution. The possible detection mechanism has been discussed in detail.

Graphical abstract: Two luminescent lanthanide(iii) metal–organic frameworks as chemosensors for high-efficiency recognition of Cr(vi) anions in aqueous solution

Supplementary files

Article information

Article type
Paper
Submitted
26 Jul 2018
Accepted
30 Aug 2018
First published
30 Aug 2018

Dalton Trans., 2018,47, 15694-15702

Two luminescent lanthanide(III) metal–organic frameworks as chemosensors for high-efficiency recognition of Cr(VI) anions in aqueous solution

J. Zou, L. Li, S. You, Y. Liu, H. Cui, J. Cui and S. Zhang, Dalton Trans., 2018, 47, 15694 DOI: 10.1039/C8DT03050B

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