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

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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

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Publication details

The article was received on 26 Jul 2018, accepted on 30 Aug 2018 and first published on 30 Aug 2018


Article type: Paper
DOI: 10.1039/C8DT03050B
Citation: Dalton Trans., 2018, Advance Article
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    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, Advance Article , DOI: 10.1039/C8DT03050B

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