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- W1528022276 abstract "Abstract A series of luminescent ionic liquids based on pentanitratoeuropate(III) anions combined with imidazolium cations, namely, 1,2,3‐trimethylimidazolium {[MC 1 mim] 2 [Eu(NO 3 ) 5 ] (1)}, 1,3‐dimethylimidazolium {[C 1 mim] 2 [Eu(NO 3 ) 5 ] (2)}, 1‐ethyl‐3‐methylimidazolium {[C 2 mim] 2 [Eu(NO 3 ) 5 ] (3)}, 1‐butyl‐3‐methylimdazolium {[C 4 mim] 2 [Eu(NO 3 ) 5 ] (4)}, 1‐hexyl‐3‐methylimidazolium {[C 6 mim] 2 [Eu(NO 3 ) 5 ] (5)}, and 1‐methyl‐3‐octylimidazolium {[C 8 mim] 2 [Eu(NO 3 ) 5 ] (6)}, were synthesized. These complexes were characterized by NMR and IR spectroscopy as well as elemental analysis. They exhibit high thermostability and wide liquidus ranges of more than 300 °C. Colorless plate crystals of 1 were isolated, and the crystal structure was determined by single‐crystal X‐ray diffraction [monoclinic system, C 2/ c space group with the cell parameters a = 21.6870(6) Å, b = 9.9807(4) Å, c = 15.0267(6) Å, β = 131.140(4)°, Z = 4]. In the [Eu(NO 3 ) 5 ] 2– anion, the 10‐coordinate Eu III ion is coordinated by five bidentate nitrate ligands and has a highly symmetrical trigonal‐bipyramidal geometry. Compounds 1–6 exhibit bright red luminescence of high colorimetric purity. Only two characteristic narrow monochromatic bands, arising from the 5 D 0 → 7 F J ( J = 1 and 2) intraconfigurational f–f transitions, were clearly observed in their emission spectra at 298 K. The intense red photoluminescence is still stable at 150 °C. These 10‐coordinated Eu III complexes are of interest as potential thermally stable luminescent soft materials." @default.
- W1528022276 created "2016-06-24" @default.
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- W1528022276 date "2014-12-16" @default.
- W1528022276 modified "2023-10-10" @default.
- W1528022276 title "Structures and Properties of Luminescent Pentanitratoeuropate(III) Ionic Liquids" @default.
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- W1528022276 doi "https://doi.org/10.1002/ejic.201403018" @default.
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