TY - JOUR
T1 - Synthesis and properties of magnetic aryl-imidazolium ionic liquids with dual Brønsted/Lewis acidity
AU - Chang, Jui Cheng
AU - Yang, Che Hsuan
AU - Sun, I. Wen
AU - Ho, Wen Yueh
AU - Wu, Tzi Yi
N1 - Funding Information:
This work was financially supported by the Ministry of Science and Technology (MOST) of Taiwan (MOST 105-2113-M-006-013-MY2 and MOST 105-2221-E-041-004) (https://www.most.gov.tw). The authors would like to thank the Instrument Center of National Cheng Kung University (Min-Kai Lee for the magnetic susceptibility and hysteresis loop data, Chia-Chen Tsai for the element analysis data, Tsung-Lun Kan for NMR measurements, and Ming-Feng Chen for mass spectra). The authors would also like to thank Chen-I Yang for advice on magnetic discussions.
PY - 2018/12/13
Y1 - 2018/12/13
N2 - A series of unique tunable aryl-imidazolium magnetic ionic liquids (MILs) with dual acidity that contain both Brønsted and Lewis acidic sites (abbreviated as B-L MILs) were synthesized and characterized using nuclear magnetic resonance and mass spectrometry. Physical properties, such as thermal properties, magnetic susceptibility, and Brønsted and Lewis acidity, were measured. These properties were found to depend on the cation structure. These B-L MILs had good solubility in many organic solvents, good thermal stability, and low melting points, and exhibited magnet-like behavior. For these B-L MILs, the Brønsted acidity was measured using ultraviolet-visible (UV-Vis), and the Lewis acidity was measured using Fourier transform infrared spectroscopy (FTIR). The results showed that B-L MILs with an electron-withdrawing group in the aryl-imidazolium moiety had higher Brønsted acidity, whereas those with an electron-donating group had higher Lewis acidity. This type of ionic liquid, with both Brønsted and Lewis acidic sites, is expected to be a useful solvent and catalyst for organic reactions.
AB - A series of unique tunable aryl-imidazolium magnetic ionic liquids (MILs) with dual acidity that contain both Brønsted and Lewis acidic sites (abbreviated as B-L MILs) were synthesized and characterized using nuclear magnetic resonance and mass spectrometry. Physical properties, such as thermal properties, magnetic susceptibility, and Brønsted and Lewis acidity, were measured. These properties were found to depend on the cation structure. These B-L MILs had good solubility in many organic solvents, good thermal stability, and low melting points, and exhibited magnet-like behavior. For these B-L MILs, the Brønsted acidity was measured using ultraviolet-visible (UV-Vis), and the Lewis acidity was measured using Fourier transform infrared spectroscopy (FTIR). The results showed that B-L MILs with an electron-withdrawing group in the aryl-imidazolium moiety had higher Brønsted acidity, whereas those with an electron-donating group had higher Lewis acidity. This type of ionic liquid, with both Brønsted and Lewis acidic sites, is expected to be a useful solvent and catalyst for organic reactions.
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U2 - 10.3390/ma11122539
DO - 10.3390/ma11122539
M3 - Article
AN - SCOPUS:85058565717
VL - 11
JO - Materials
JF - Materials
SN - 1996-1944
IS - 12
M1 - 2539
ER -