The Soft Material Obtained from an Europium (III)-Containing Ionic Liquid

Abstract

The addition of organic ligand (β-diketone or heterocyclic compound) to the europium (III)-containing ionic liquid resulted in bright luminescent soft materials with the molar ratio of europium/ionic liquid (IL)/ligand being 1:3:1 that exhibit bright red light under UV lamp. The luminescent properties such as emission features and lifetime of 5 D0 Eu3+ excited level are dependent on the organic ligands. The materials were characterized by FT-IR and luminescence spectroscopy. The data shows that at least parts of the ILs (carboxylic acid) are replaced with β-diketone ligand rather than the formation of europium complex with the molar ratio of Eu 3+ : IL: ligand being 1:3:1, while no ILs could be replaced by the heterocyclic ligand such as Bpy and Phen.

α‐ and β‐[Bmim][BiCl4(2,2′‐bpy)]: Two Polymorphic Bismuth‐Containing Ionic Liquids with Crystallization‐Induced Phosphorescence

“…ILs can also constitute advanced materials, with properties that can be tuned by modifying the cations and anions to meet the requirements of different applications . An effective strategy for designing functional ILs is to introduce a metal center ( M ) into the anion of the IL, forming an [ MX n ] y − anion, where X is typically Cl − , Br − , I − , CN − , SCN − , NO 3 − , Tf 2 N − (Tf 2 N − =bis(trifluoromethylsulfonyl)imide), and so on, taking advantage of the inherent properties of metal ions, such as magnetism, luminescence and catalysis . In particular, in the past decade, researchers have made headway in fabricating luminescent metal‐containing ILs by choosing appropriate metal centers for the [ MX n ] y − anions.…”

Self-Assembly Syntheses, Structural Characterization, and Luminescent Properties of Lanthanide Coordination Polymers Constructed by Three Triazole-Carboxylate Ligands

“…Since last century, scientists have focused extensive attention on the design and applications of the lanthanide coordination complexes due to their attractive photophysical properties, such as characteristic luminescent emissions, high fluorescence quantum yields, and long observed lifetimes, which enable them to be potential functional materials in light-emitting devices, chemical sensors, biomedical and cell imaging, etc. − Especially terbium and europium complexes, two most useful lanthanide complexes with extraordinary luminescent characteristics, consisting of sharp typical emission bands and millisecond lifetimes, are regarded to be promising potential optical materials. − Despite the efficient photoluminescence processes of lanthanide ions, all Ln 3+ ions suffer from weak light absorption (the molar absorptivities generally less than 10 M –1 cm –1 ) due to the “‘Laporte forbidden”’ feature of the transitions between the 4f n configurations of the Ln 3+ ions. − The “Antenna effect”, founded by Weissman, is an effective way to overcome the weak light absorption by introducing organic chromophores (L) as antennas. − Therefore, many different varieties of ligands, including β-diketones − and carboxylic acid derivatives, − have been employed to construct highly luminescent lanthanide complexes.…”

Transparent and luminescent ionogels based on lanthanide-containing ionic liquids and poly(methyl methacrylate) prepared through an environmentally friendly method

“…8,16,17 Recently, we have developed an alternative method to produce soft luminescent materials by dissolving lanthanide oxides and organic ligands (1,10-phenanthroline and 2-thenoyltrifluoroacetonate) into [Carb-mim]Br, without the addition of extra solvent. [18][19][20] Nevertheless, the utilization of ILs as advanced functional materials is in most cases limited by their liquid state. Encapsulation of ILs doped with lanthanide complexes in silica via a three-step procedure leads to a novel family of luminescent organic-inorganic hybrid materials, i.e., the luminescent ionogels, which are endowed with the mechanical, electrical and luminescent properties of all of the components (silica, lanthanide complex and ionic liquid).…”