Zinc Metal-Organic Framework for Selective Detection and Differentiation of Fe(III) and Cr(VI) Ions in Aqueous Solution

Rui Lv; Hui Li; Jian Su; Xin Fu; Boyi Yang; Wen Gu; Xin Liu

doi:10.1021/acs.inorgchem.7b01822

Zinc Metal-Organic Framework for Selective Detection and Differentiation of Fe(III) and Cr(VI) Ions in Aqueous Solution

Inorg Chem. 2017 Oct 16;56(20):12348-12356. doi: 10.1021/acs.inorgchem.7b01822. Epub 2017 Oct 2.

Authors

Rui Lv¹, Hui Li¹, Jian Su¹, Xin Fu¹, Boyi Yang¹, Wen Gu¹, Xin Liu¹

Affiliation

¹ College of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry (MOE), Tianjin Key Laboratory of Metal and Molecule Based Material Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University , Tianjin 300071, P. R. China.

PMID: 28967744
DOI: 10.1021/acs.inorgchem.7b01822

Abstract

A new luminescent Zn(II)-based metal-organic framework (MOF), [Zn₂(TPOM)(NDC)₂]·3.5H₂O (Zn-MOF; TPOM = tetrakis(4-pyridyloxymethylene)methane and H₂ndc = 2,6-naphthalenedicarboxylic acid), was successfully synthesized by a hydrothermal reaction. The MOF exhibits excellent luminescence emission, and it can detect Fe(III) and Cr(VI) ions with high selectivity, well antiinterference performance, and short response time. In addition, Zn-MOF was selected as a parent coordination compound to encapsulate Eu³⁺ cations to obtain a Eu³⁺-incorporated sample (Eu³⁺@Zn-MOF). Subsequently, we explored the potential application of Eu³⁺@Zn-MOF as a probe for the selective sensing of Fe(III) and Cr(VI) ions, and it revealed that we could differentiate Fe(III) and Cr(VI) ions by the combination Zn-MOF and Eu³⁺@Zn-MOF. More importantly, it represents the first example of MOF-based luminescent sensors which can detect and differentiate Fe(III) and Cr(VI) ions selectively. And the possible sensing mechanism was discussed in detail.