Water-stable LnIII-based coordination polymers displaying slow magnetic relaxation and luminescence sensing properties
| Autor: | Xiu-Mei Zhang, Wei Gao, Han Wei, Jieping Liu, Cui-Li Wang, Ai-Mei Zhou |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | New Journal of Chemistry. 44:6747-6759 |
| ISSN: | 1369-9261 1144-0546 |
| DOI: | 10.1039/d0nj00828a |
| Popis: | Six new two-dimensional isostructural lanthanide coordination polymers (LnIII-CPs), [Ln2(L)3(H2O)3]·DMF (Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5) and Ho (6), H2L = 3-(3,5-dicarboxylphenoxy)pyridine), have been fabricated successfully under solvothermal conditions. In these compounds, LnIII ions are linked by the mixed (μ-Ocarboxylate)(COO)2 triple bridges to give dinuclear motifs. The motifs are connected through single carboxylate bridges to give alternating chains, and the chains are interlinked by the L ligands to produce 2D layers. Their structures with accessible Lewis-base sites and coordinated water molecules could easily recognize various analytes. The dc magnetic susceptibility studies for Gd-CP (3) and Ho-CP (6) reveal the occurrence of probable antiferromagnetic interactions, but for Dy-CP (5) show ferromagnetic interactions. Further investigations suggest that Dy-CP (5) displays slow magnetic relaxation behavior with an energy barrier (ΔUeff) and a pre-exponential factor (τ0) of 25.47 K and 1.25 × 10−6 s at 1200 Oe dc field, respectively. The luminescence explorations suggest that Eu-CP (2) and Tb-CP (4) can exhibit high quenching efficiency and low detection limit for sensing Fe3+, MnO4−, CrVI-anions (CrO42−, Cr2O72−) and 2,4,6-trinitrophenol (TNP) in water systems. Moreover, in the process of detecting analytes, Eu-CP (2) and Tb-CP (4) not only exhibit excellent water stability and strong luminescence, but also show remarkable recyclability and regeneration. Especially, Eu/Tb-CP can detect Fe3+, MnO4−, CrO42− and Cr2O72− simultaneously, which is rarely reported in the past. |
| Databáze: | OpenAIRE |
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