Inelastic neutron scattering study on boson peaks of imidazolium-based ionic liquids was written by Kofu, Maiko;Inamura, Yasuhiro;Moriya, Yosuke;Podlesnyak, Andrey;Ehlers, Georg;Yamamuro, Osamu. And the article was included in Journal of Molecular Liquids in 2015.Reference of 79917-89-8 This article mentions the following:
Low energy excitations of 1-alkyl-3-methylimidazolium ionic liquids (ILs) have been investigated by means of neutron spectroscopy. In the spectra of inelastic scattering, a broad excitation peak referred to as a “boson peak” appeared at 1-3 meV in all of the ILs measured. The intensity of the boson peak was enhanced at the Q positions corresponding to the diffraction peaks, reflecting the in-phase vibrational nature of the boson peak. Furthermore the boson peak energy (EBP) was insensitive to the length of the alkyl-chain but changed depending on the radius of the anion. From the correlation among EBP, the anion radius, and the glass transition temperature Tg, we conclude that both EBP and Tg in ILs are predominantly governed by the inter-ionic Coulomb interaction which is less influenced by the alkyl-chain length. We also found that the EBP is proportional to the inverse square root of the mol. weight as observed in mol. glasses. In the experiment, the researchers used many compounds, for example, 1-Methyl-3-propylimidazolium Chloride (cas: 79917-89-8Reference of 79917-89-8).
1-Methyl-3-propylimidazolium Chloride (cas: 79917-89-8) belongs to imidazole derivatives. Many natural products, especially alkaloids, contain the imidazole ring. These imidazoles share the 1,3-C3N2 ring but feature varied substituents. Imidazole derivatives have antibacterial, antifungal and anticancer functionality. It interacts with DNA and also binds to protein and stops cell division.Reference of 79917-89-8
Referemce:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem