Syntheses, Structures and Luminescence Sensing Properties of Two Cd(II) MOFs Constructed from Mixed Ligands

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ORIGINAL PAPER

Syntheses, Structures and Luminescence Sensing Properties of Two Cd(II) MOFs Constructed from Mixed Ligands Fang-Hua Zhao1



Jian-Hui Han1 • Yu-Wen Lin1 • Shao-Shuang Zou2 • Tao Liu3 • Zhong-Lin Li1

Received: 12 January 2020 / Accepted: 1 November 2020  Springer Science+Business Media, LLC, part of Springer Nature 2020

Abstract Hydrothermally reaction of Cd(NO3)24H2O, pimelic acid (H2Pim) mixed with two N-containing ligands of 1,2-bis(2methyl-imidazol-1-ylmethyl)benzene (1,2-mbix) or 1,3-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,3-mbix) gave rise to two new Cd(II) MOFs, [Cd(Pim)(1,2-mbix)] (1) and [Cd(Pim)(1,3-mbix)]H2O (2). Both MOFs were structurally characterized by IR and UV–Vis spectra, single-crystal and powder X-ray diffraction, thermogravimetric analyses. MOF 1 shows a fourfold interpenetrating dia network. Differently, MOF 2 shows a 2D ? 3D interdigitated architecture base on the 63 hcb layer when 1,2-mbix was replaced by 1,3-mbix. The luminescent properties of 1 and 2 have been investigated. Furthermore, the luminescent quenching experiments suggest both MOFs exhibit good selectivity and sensitivity to detect Fe3? and Cr2O72- in water. Keywords Mofs  Dia net  Interdigitated architecture  Hcb net  Luminescence sensing

Introduction With the development of modern industry, environmental pollution has drawn increasingly concern expecially for the contamination of water resource, because of the health hazard to humans. Among common toxic pollutants, the trivalent cation of iron (Fe3?), though it is an important element in many chemical and biological processes [1, 2], but abnormal concentrations of Fe3? may result in numerous diseases such as bonesoftening, dysfunction of

Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10876-020-01931-3) contains supplementary material, which is available to authorized users. & Fang-Hua Zhao [email protected] & Zhong-Lin Li [email protected] 1

College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, China

2

College of Chemistry and Chemical Engineering, Qilu Normal University, Jinan 250200, China

3

Key Laboratory of Functional Polymer Materials of Ministry of Education, College of Chemistry, Nankai University, Tianjin 300071, China

organs and encephalopathy [3, 4]. And the hexavalent chromium ion (Cr2O72- anion) with strong oxidability and carcinogenicity in water could result in cancer, deformity and gene mutation [5, 6]. Therefore, it is of great significance to detect Fe3? and Cr2O72- ions with high selectivity and sensitivity in the protection of environment and human health. Recently, metal–organic frameworks (MOFs) used as luminescence sensing materials have attracted considerable interest due to their remarkable advantages, such as short response time, measurement flexibility and high sensitivity [7, 8]. And the luminescent MOFs have been widely explored in the detection of toxic pollutants, such as inorganic heavy