Magnetic Mesoporous Silica Nanosphere Supported Europium(III) Tetrakis(β-diketonate) Complexes with Ionic Liquid Compounds as Linkers



A series of organic–inorganic hybrids are prepared with magnetic mesoporous silica nanosphere supported europium(III) tetrakis(β-diketonate) complexes with ionic liquid compounds as linker {denoted as MMS·Im+·[Eu(β-diketonate)4]}. Firstly, Fe3O4 nanoparticles were synthesized through the coprecipitation of ferrous and ferric ion solutions and were incorporated into mesoporous silica nanospheres. Secondly, europium(III) tetrakis(β-diketonate) complexes [β-diketonate = 2-thenoyltrifluoroacetonate (TTA), 4,4,4-trifluoro-1-phenyl-1,3-butanedionate (BTA), trifluoroacetylacetonate (TAA), acetylacetone (ACAC), hexafluoroacetylacetone (HFACAC)] and the ionic liquid 1-methyl-3-[3-(trimethoxysilyl)propyl]imidazolium chloride (Im+Cl) were prepared. The ionic liquid was then covalently attached to the magnetic mesoporous silica nanospheres through the Si–O network. Finally, europium(III) tetrakis (β-diketonate) complexes were attached by an anion exchange reaction. The physical characterization, magnetic, and especially luminescent properties are discussed in detail. These results reveal that the resultant nanocomposites possess high surface area and superparamagnetic properties at 300 K. Additionally, the MMS·Im+·[Eu(TTA)4] and MMS·Im+·[Eu(BTA)4] hybrids exhibit high luminescent quantum efficiencies.