Elucidating Interactions between DMSO and Chelate-Based Ionic Liquids.
The C-D bond stretching vibrations of deuterated dimethyl sulfoxide ([D6 ]DMSO) and the C2 -H bond stretching vibrations of 1,1,1,5,5,5-hexafluoropentane-2,4-dione (hfac) ligand in anion are chosen as probes to elucidate the solvent-solute interaction between chelate-based ionic liquids (ILs) and DMSO by vibrational spectroscopic studies. The indirect effect from the interaction of the adjacent S=O functional group of DMSO with the cation [C10 mim](+) and anion [Mn(hfac)3 ](-) of the ILs leads to the blue-shift of the C-D stretching vibrations of DMSO. The C2 -H bond stretching vibrations in hfac ligand is closely related to the ionic hydrogen bond strength between the cation and anion of chelate-based ILs. EPR studies reveal that the crystal field of the central metal is kept when the chelate-based ILs are in different microstructure environment in the solution.
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.
Hang
H
Chen
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.
Xinyu
X
Wang
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.
Jia
J
Yao
State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China.
Kexian
K
Chen
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.
Yan
Y
Guo
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China.
Pengfei
P
Zhang
Department of Chemistry, ZJU-NHU United R&D Center, Zhejiang University, Hangzhou, 310027, China. lihr@zju.edu.cn.|State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310027, China. lihr@zju.edu.cn.
Haoran
H
Li
Fourier-transform infrared spectroscopy; chelate-based ionic liquids; electron paramagnetic resonance; ionic hydrogen bond; solvent-solute interactions