Synthesis, structure, and physico-optical properties of manganate(II)-based ionic liquids

Chemistry : a European Journal
Slawomir Pitula, Anja-Verena Mudring

Abstract

Several ionic liquids (ILs) based on complex manganate(II) anions with chloro, bromo, and bis(trifluoromethanesulfonyl)amido (Tf(2)N) ligands have been synthesized. As counterions, n-alkyl-methylimidazolium (C(n)mim) cations of different chain length (alkyl=ethyl (C(2)), propyl (C(3)), butyl (C(4)), hexyl (C(6))) were chosen. Except for the 1-hexyl-3-methylimidazolium ILs, all of the prepared compounds could be obtained in a crystalline state at room temperature. However, each of the compounds displayed a strong tendency to form a supercooled liquid. Generally, solidification via a glass transition took place below -40 degrees C. Consequently, all of these compounds can be regarded as ionic liquids. Depending on the local coordination environment of Mn(2+), green (tetrahedrally coordinated Mn(2+)) or red (octahedrally coordinated Mn(2+)) luminescence emission from the (4)T(G) level is observed. The local coordination of the luminescent Mn(2+) centre has been unequivocally established by UV/Vis as well as Raman and IR vibrational spectroscopies. Emission decay times measured at room temperature in the solid state (crystalline or powder) were generally a few ms, although, depending on the ligand, values of up to 25 ms were obtain...Continue Reading

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Citations

Apr 9, 2013·Chemosphere·Raquel F M FradeCarlos A M Afonso
Aug 6, 2013·Journal of Hazardous Materials·Hejun GaoLiqiang Zheng
Mar 8, 2014·Journal of Environmental Management·Hejun GaoLiqiang Zheng
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