| Metal-organic frameworks?MOFs?have been widely explored in recently years due to their novel structures and potential applications in catalysis,gas storage and separate,drug delivery,magnetism,chemical sensor and so on.In rencent years,MOFs have been studied as fluorescent sensing materials to probe metal ions,organic small molecules,nitroaromatic compounds and other guest molecules.Among various detection methods,Fluorescence recognition is the most convenient and effective method.Fluorescence sensor usually detect analyte by the means of fluorescence quenching,fluorescence enhancement and fluorescence shift.Here,we report the syntheses,strucrures and luminescent sensing properties of several MOFs.The main contents of this paper are as follows:?1?Five different structures compound[Mg9?L?4?H2O?24]SO4·solvent?1·solvent?,[Ca3?HL?2?H2O?2]·3H2O·DMF?2·3H2O·DMF?,[Ca?H2L?]?3?,[Sr?H2L??H2O?3]·2H2O?4·2H2O?,Ba?H2L??5?were synthesized under solvothermal conditions by reactions of aromatic carboboxylates and phosphonate ligand?H4L?and IIA metal salts.The sensing experiments show that compound Ba?H2L?has high sensing ability for Al3+ion.?2?Three different compounds[Mn9?L?4?H2O?24]Cl2·solvent?6·solvent?,[Cd3?HL?2?H2O?2]·10H2O?7·10H2O?,[Ag2?H2L?]?8?were synthesized under solvothermal conditions by reactions of H4L and MnCl2·4H2O,CdCl2·2.5H2O and AgNO3,respectively.All of these three compounds can sense Al3+.The existence of energy transfer between the Al3+ion and the framework of compound 7 lead to the fluorescent enhancement.?3?Four compounds[Li?H3L?]?9?,[Na?H3L?]?10?,[K?H3L?]?11?,[Cs2?H2L?]·H2O?12·H2O?were synthesized by reactions of H4L and LiF,NaCl,KCl,CsCl under solvothermal conditions.The luminescence properties of these compounds were studied. |
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