Luminescent Vesicles and Lyotropic Liquid Crystalsin Ethylammonium Nitrate from a Partially Amphiphilic Eu Complex

摘要

Soft luminescent materials have attracted much attention because of their self-assembled and controllable properties. To explore their facile and effective fabrication ways, we report here the self-assembling of luminescent vesicles and lyotropic liquid crystals (LLCs) in a protic ionic liquid, ethylammonium nitrate, by a partially amphiphilic europium β-diketonate complex (Eu(III)) with a 1-dodecyl-3-methylimidazolium cation as the counter ion. An interesting result came from the complex-induced vesicle formation of corresponding amphiphile, 1-dodecyl-3-methylimidazolium bromide ([C12mim]Br), which has been rarely reported in the past. It was the interaction between the Eu(III) and imidazolium group that changed the critical packing parameter of [C12mim]Br, which finally resulted in the occurrence of vesicles. The obtained vesicle aggregates exhibited enhanced fluorescence intensity and lifetime compared to those of Eu(III) solution. Meanwhile, a hexagonal LLC phase with better fluorescence properties was found at higher [C12mim]Br concentration. The obtained photophysical data confirmed that the order degree of Eu(III)-containing aggregates couldeffectively increase the energy transition efficiency of ligands.The better luminescent properties of LLC resulted from the strongerstabilizing and binding effects on Eu(III) in LLC than that in vesicles,which might be caused by closer molecular packing in LLC. The resultspresented here will not only expand the strategy of constructing lanthanide-containingluminescent soft materials in ionic liquids but also provide referenceto better understand the effect of organized aggregates on luminescenceproperties.