Ultrasonic Relaxation Spectra for Pyrrolidinium Bis(trifluoromethylsulfonyl)imides: A Comparison with Imidazolium Bis(trifluoromethylsulfonyl)imides

• DOI: 10.1021/acs.jpcb.7b07433
• Publication Date: 2017-09-26T21:16:03Z
• Authors: Edward Zorębski; Michał Zorębski; Małgorzata Musiał; Marzena Dzida
• Keywords: 01 natural sciences; 0104 chemical sciences

Ultrasound absorption spectra within the frequency range 10-300 MHz were determined for 1-propyl- and 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imides at ambient pressure temperatures in ranges 293.15-313.15 293.15-323.15 K, respectively. For both compounds, a single Debye model (relaxation times between 0.451 0.778 ns) thoroughly describes observed ultrasound investigated ranges. The resemble those imidazolium-based ionic liquids with same anion. relaxation is dependent on alkyl chain length of pyrrolidinium ring. In comparison to adequate bis(trifluoromethylsulfonyl)imides, pyrrolidinium-based stronger; cation causes clearly greater than imidazolium cation. Also, estimated velocity dispersion stronger case imides imides. turn, ultrasonic data literature dielectric exemplified 1-butyl- side indicates strong coupling ring weak effect speed sound also discussed.